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As the fundamental energy storage components in electronic systems, dielectric capacitors with high power densities were demanded. In this work, the anti-ferroelectric Pb0.89La0.06Sr0.05(Zr0.95Ti0.05)O3 (PLSZT) ceramics and thin film capacitor were successfully fabricated by a solid-state reaction route and pulsed laser deposition method, respectively. The ferroelectric, dielectric, energy-storage properties, and temperature stability of anti-ferroelectric PLSZT capacitor were investigated in detail. By compared with the PLSZT ceramic (energy storage density is 1.29 J/cm3 with an efficiency of 78.7% under 75 kV/cm), the anti-ferroelectric PLSZT thin film capacitors exhibited the enhanced energy storage density of 52.6 J/cm3 with efficiency of 67.7% under an electric field as high as 2068.9 kV/cm, and the enhanced energy-storage temperature stabilities from room temperature (RT) to more than 200 °C were demonstrated, and the oxygen defects mechanism and size effect were discussed. Moreover, the fast charging (∼0.05 μs) and discharging (∼0.15 μs) time were certified for the anti-ferroelectric PLSZT film capacitor. These findings broaden the horizon for PLSZT anti-ferroelectrics in high energy storage properties and show promising for manufacturing pulse power capacitor.

Polymer film capacitors are usually limited to relatively low working temperatures due to the large conduction loss of polymer dielectrics under high thermal stress. Here, a polymer dielectric sandwiched by medium-dielectric-constant nanoscale deposition layers is reported, which exhibits significantly suppressed conduction loss and outstanding capacitive performance at high temperatures. A series of deposition materials with distinct band structures and dielectric properties are investigated. It is found that well-balanced bandgap, dielectric constant and electrical conductivity of the nanoscale deposition layer is desirable for suppressing charge injection. The substantial performance improvements are demonstrated to result from the slow decay of barrier height with increasing electric field and the reduced electric field in the deposition layers. The optimized design using a polyetherimide film sandwiched by 150-nm-thick Al2O3 deposition layers gives rise to a concurrent high discharged energy density (2.8 J cm−3) and charge-discharge efficiency (90%) up to 200 °C, which are significantly higher than those of previously reported surface-coated polymer dielectrics, and are even comparable to the maximum values achieved with expensive, less productive solution-based composite approaches. Moreover, the nanoscale coating layer can be fabricated through evaporation deposition techniques, which is accessible with industrial equipment for fast surface deposition of capacitor films

Metallized Film Capacitors (MFC) are vital devices in many important fields such as energy, transportation, and aviation, whilst Digital Twin (DT) technology opens a new channel to leverage existing data resources of metallized film capacitors. This paper review current knowledge about metallized film capacitors and digital twin, list the key issues, propose frameworks, and provide the outlook to clarify the potential of digital twin’s application in metallized film capacitors. First, based on the development history and research status of metallized film capacitors, this review sorts out the key research issues of data utilization. Then, the connotation and typical characteristics of the digital twin definition are combed and refined, and the typical architecture of digital twin implementation is presented. Furthermore, the overall application architecture of digital twin in metallized film capacitors is constructed, and the technology system of each application scenario and the role of digital twin are analyzed. Finally, the main challenges in the application of the digital twin in metallized film capacitors and the future development directions are discussed. This review promotes the performance improvement, cost reduction and application expansion of metallized film capacitors, which can be used as a guide for the application of digital twin in other power equipment of energy system.

Well-crystallized perovskite ferroelectric films usually display a bulk-like polarization response (P) under an external electric field (E), i.e., a large P-E hysteresis loop featuring a sizable remnant polarization and an early polarization saturation. Such characteristics are undesirable for capacitive energy storage applications. In this work, we demonstrate an optimal P-E behavior, i.e., a small remnant polarization and a delayed polarization saturation, in perovskite BaTiO3 films consisting of superfine columnar nanograins. In a low-temperature, nucleation-dominated sputtering deposition, an in-situ grown conductive buffer layer promotes the formation of these nanograins, which display a controllable diameter down to ~10 nm and extend throughout the film thickness. The deterioration of the remnant polarization and its delayed saturation under an electric field, can be attributed to a strong polarization-constraining effect from the densely-packed, non-ferroelectric grain boundaries, which is supported by a phase field modeling simulation. The resulted BaTiO3 film capacitors integrated on Si at 350°C display a high recyclable energy density (Wrec~135±10 J/cm3) and efficiency (η~80%±4%) which are thickness-scalable. An intrinsically high power density, a simple and stable chemical composition, and good thermal (-150°C ~ 170°C) and cycling stabilities (up to ~ 2 × 108 charge-discharge cycles) warrant a broad range of applications for these film capacitors.

Polymer-based dielectric energy storage materials have been playing critical roles in high-performance energy storage capacitors due to their high breakdown electric fields and facile processability. However, the low energy density and efficiency of polymer-based film capacitors limit their widespread application in various electronics products. In this contribution, we synthesized the SrBi4Ti4O15 (SBT) nanosheets with large aspect ratio by using the molten salt method and introduced them into the PVDF matrix to prepare a multilayer nanocomposite film, of which the discharge energy density and discharge efficiency were much improved. Finite element simulation results show that the addition of 2D SBT nanosheets can significantly improve the local electric field distribution of nanocomposite films. Finally, a high discharge energy density of 11.69 J cm−3 and an excellent discharge efficiency of 78.95% were simultaneously achieved in the 0/5/0 sample. This work provides a reference for polymer-based dielectrics with excellent comprehensive energy storage performance.

Flexible lead-free Na0.5Bi0.5TiO3–EuTiO3 solid solution film capacitors were fabricated. The recoverable energy storage density and energy storage efficiency reach 65.4 J/cm3 and 52%, respectively, due to the great insulation characteristic and relaxor behaviors. And the energy storage performances for the flexible solid solution films show excellent stabilities on temperature, frequency and bending endurance, especially, with bending endurance stability over 105 cycles. And the energy storage performances still remain great properties after delay of a month and another 105 cycles. This work provides a candidate for the flexible film capacitors with giant application potentials in wearable energy storage devices.

Film capacitor, one typical type of electrostatic capacitors, exhibits its unique advantages in the high-power energy storage devices operating at a high electric field due to the high electrical breakdown strength (Eb) of the polymeric films. However, the development of film capacitor towards high energy storage density is severely hindered by the low dielectric constant (e) and low charge-discharge efficiency (η) of the polymeric films. The film of polypropylene (PP), the most used polymeric film with a market share of 50%, owns a high η due to its low inherent hysteresis loss. Yet the low e (2.2 ​at 103 ​Hz) impedes the increase of its energy storage density (1–2 ​J/cm3). Here we demonstrate that the discharged energy density (Ue) of PP film could be largely increased from 1.40 ​J/cm3 of pure PP film to 3.86 ​J/cm3 of PP nanocomposite film by incorporating a small loading of core-shell structured PMMA@BaTiO3 (PMMA@BT) nanoparticles (2.27 ​vol%) into PP matrix. The obtained Ue of 3.86 ​J/cm3, to the best of our knowledge, is the highest reported value for the PP based films using commercial PP resin. Meanwhile, the η merely undergoes a slight decrease from 99.5% to 94.1%. Similarly, the obtained η of 94.1%, to the best of our knowledge, is also the highest value for the polymeric films reported in the previous works. The significant increase of Ue (175.7%) and negligible decrease of η (5.4%) are mainly attributed to the increases of e from 2.2 to 3.7 and Eb from 361 ​MV/m to 448 ​MV/m. Compared with the films of raw BT/PP nanocomposites, the Ue exhibits a significant increase of 365.1% from 0.83 ​J/cm3 to 3.86 ​J/cm3 and the η also displays an increase of 7.4% from 87.6% to 94.1%. The significant improvement of energy storage performance achieved in the film of PMMA@BT/PP nanocomposite suggests that the organic PMMA shell plays an important role in the amelioration of compatibility of BT nanoparticles and PP matrix and the alleviation of local electric field concentration. Moreover, the PMMA shell could also provide a robust scaffold to hinder the early breakdown failure of nanocomposites due to its high Eb (425 ​MV/m). Thus, high e, low loss and high Eb are simultaneously achieved. Specifically, the high hot stretch ratio (1:4) of nanocomposite film indicates the strong feasibility of industrialized film processing. Apart from the experimental analysis, theoretical analysis using the simulation of finite element is also carried out to figure out the influence of organic PMMA shell on the dielectric performance of PP nanocomposites films. These findings enable the development of film capacitor using non-polar PP based film towards high energy storage density.

The current urgent desire of the renewable energy has imposed much challenge and inspiration for the design and development of the lead-free dielectric capacitors. High recoverable energy storage density (Wrec) and efficiency (η) associated with long-time stability are highly demanded for the pulsed power systems. Here, we present a significantly enhanced energy storage performance in (Ce,Mn) hybrid doped (Na0.8K0.2)0.5Bi0.5TiO3–BiFeO3 [(Ce,Mn):NKBT-BFO] ceramic film capacitor deposited on indium tin oxide (ITO)/glass substrate. Meanwhile, the pure NKBT-BFO, Ce doped NKBT-BFO and Mn doped NKBT-BFO are studied for comparison. A large Wrec of 58.3 J/cm3 together with a high η of 58.1% is realized in (Ce,Mn):NKBT-BFO at 2200 kV/cm, which is proposed by the formation of a slim loop with a large difference between the remanent polarization (Pr) and maximum polarization (Pmax) at a high dielectric breakdown field strength. Moreover, the energy storage property is weakly dependent on time with small variations of Wrec (

This work reports the structure, growth rate, dielectric response, and capacitance properties of (100)-oriented Ba0.67Sr0.33TiO3 (BST)/LaNiO3 (LNO) hetero-structure thin films with varied BST layer thicknesses from 34 nm to 342 nm. The BST/LNO hetero-structure thin films were prepared by radiofrequency magnetron sputtering technique on Pt/SiO2/Si substrates. The XRD results showed that the compressive stress is relaxed at around 73 nm of BST layer, and above 119 nm of the BST layer thickness, the tensile stress has a significant effect on the crystal structure of the BST/LNO hetero-structure film. The growth rate of the BST films was thickness-dependent which was strongly related to the minimization of the strain energy. The dielectric constant of BST layer with the compressive stress increase from 177 to 2640 with the increase of BST layer thickness. The BST layer with the tensile stress showed a comparably stable dielectric constant of 2400. In addition, the capacitance properties and the electrical breakdown strength of BST/LNO hetero-structure thin films are also thickness-dependent, respectively. The electrical breakdown strength reached a maximum value of 1237 kV/cm in the BST/LNO hetero-structure thin film with ~73 nm BST layer.

The development of flexible film dielectric capacitors with high discharge energy densities is of central significance for advanced electric and electronic power systems. Herein, a novel sandwich structure designed barium titanate/poly(methyl methacrylate) (BT/PMMA) nanocomposites are prepared layer-by-layer using solution casting method. The outer two layers with low BT nanoparticles concentration offered a considerably higher breakdown strength, while the central polarization layer with higher BT nanoparticles concentration presented higher dielectric constant to the nanocomposites. Consequently, 1-9-1 BT/PMMA nanocomposite compared to its single-layered counterpart (i.e. 9 wt% BT/PMMA) showed a ∼238% improvement in discharge energy density (i.e. from 1.8 J/cm3 to 6.08 J/cm3). The discharge rate analysis presented that 1-9-1 BT/PMMA discharges in 2.44 μs with a power density of about 0.5 MW/cm3 at a time constant (τ0.9). This work significantly paves the way for using sandwich-structured linear polymer nanocomposites in high energy density and fast discharge rate dielectrics application.

The development of polymer dielectric nanocomposite with high energy density and low charge-discharge loss retains primary project of polymer capacitor for portable electronics and embedding power system. In this work, we introduced hydroxyl groups on the barium titanate (BTO), which yielded hydrogen bonds with fluorine atoms in the P(VDF-TrFE) matrix. The released energy density for 10 wt% modified BTO/P(VDF-TrFE) nanocomposite film is 4.8 J/cm3 with a charge-discharge efficiency of 74% at 150 MV/m due to transition of electroactive phase and improved interfacial polarization. This strategy provides simple approach for high electrical storage and commendable way for the commercial film capacitor.

Compared with chemical modification of ferroelectric poly (vinylidene fluoride) (PVDF) for electric energy storage, polymer blends, whether miscible or immiscible, represent a much easier approach to suppress the ferroelectricity of PVDF. In this study, we explored both miscible [i.e., poly (methyl methacrylate) or PMMA] and immiscible (i.e., polycarbonate or PC) blends with poly (VDF-co-hexafluoroethylene) [P(VDF-HFP)], as well as the PC/P(VDF-HFP) multilayer films. For miscible PMMA/P(VDF-HFP) blend films, the addition of PMMA significantly decreased the crystallinity of P(VDF-HFP). At a high PMMA content of ca. 40 wt%, the stretched PMMA/P(VDF-HFP) blend films started to exhibit the linear dielectric behavior with suppressed ferroelectricity. For the immiscible PC/P(VDF-HFP) blend films, a high PC content of ∼50 vol% was required to suppress the ferroelectricity in P(VDF-HFP). Instead, the PC/P(VDF-HFP) multilayer films started to show linear hysteresis loops when the content of P(VDF-HFP) was only 30 vol%. More importantly, the PC/P(VDF-HFP) multilayer films exhibited significantly higher breakdown strength than the blend films. This could be attributed to the perpendicular interfaces (with respect to the applied electric field), which serve as effective blocks for hot electrons injected from the metal electrodes to pass through the film. From this study, compared to conventional miscible and immiscible blends, multilayer films are promising for next generation film capacitors, aiming to achieve high temperature tolerance, high energy density, and low loss simultaneously.

Ba0.5Sr0.5TiO3/CaCu3Ti4O12 (BST/CCTO) multilayers with different stack sequences were deposited on LaNiO3(LNO)/SiO2/Si substrates by a sol-gel process. The dielectric properties of BST/CCTO multilayers are significantly affected by the deposition sequence, the layer thickness and the impurities, effects that are interpreted using the Maxwell-Wagner interfacial polarization model. Impurities are generated by elemental interdiffusion at the interfaces of BST/CCTO, and less at the interfaces of BST/LNO and CCTO/LNO. The dielectric permittivity of the CCTO/BST/LNO/SiO2/Si sample reaches 352,200 at 10 kHz, and stabilizes above 20,000 in the range of 100 kHz to 1 MHz. This work demonstrates an effective approach to enhance dielectric properties for film capacitor applications by constructing multilayers with specific deposition sequences and layer thicknesses.

Here, large-scaled flexible Ba(Zr0.35Ti0.65)O3 ferroelectric film capacitors not only exhibit ultrahigh energy storage performances but also have excellent mechanical flexibility and ferroelectric fatigue endurance. In ultra-wide temperature range from −100 °C to 200 °C, the flexible Ba(Zr0.35Ti0.65)O3 film capacitors show excellent thermal stability with recoverable energy density (Wrec) of over 65.1 J/cm3 and efficiency (η) of over 72.9%, which presents the highest Wrec obtained up to now not only in flexible polymer film dielectric capacitors but also in the ceramic film capacitors including lead-free and lead-based film capacitors on rigid substrates in this measuring temperature range. All these results demonstrate that the flexible Ba(Zr0.35Ti0.65)O3 film capacitors have huge potential in the applications of flexible electronics operated in cold polar regions, extreme altitudes and outer space, as well as high temperature regions.

Currently, energy storage capacitors with high breakdown strength and dielectric constant are highly desired in microelectronics and electric power systems. All-organic film capacitors have been studied owing to their high breakdown strength and low dielectric loss. In this study, poly(vinylidene fluoride) (PVDF) with high breakdown strength was used as outer layers and poly(vinylidenefluoride-ter-trifluoroethylene-ter-chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)) with high dielectric constant was used as the interlayer to prepare sandwich-structured composites. These PVDF/P(VDF-TrFE-CTFE)/PVDF composites with various contents of terpolymer were manufactured through a layer-by-layer solution-casting method. At 1 kHz, the maximum dielectric constant of the sandwich-structured composites reaches up to 18.61 when the content of terpolymer is 45 vol%. The discharged energy density increases with the increasing content of terpolymer at the same electric filed. At 660 kV/mm, the composite with 25 vol% terpolymer delivers the maximum discharged energy density, which is 20.86 J/cm3.

Metallized film capacitors are used to reduce electromagnetic interference (EMI) in electric power mains due to their high voltage capability and their open circuit failure mode, which aids in safe operation. This paper presents a comprehensive review of metallized film capacitors used for EMI filtering and their failure modes and mechanisms. One of the major failure mechanisms discussed is the corrosion of the metallized film due to moisture ingress into the package. Safety, quality, and reliability standards for metallized film capacitors are also discussed. The paper concludes with recommendations for film capacitor selection and the proper qualification and accelerated life testing to ensure long-term reliable operation.

Micro-inverters have been known as promising structures for small-scale PV systems. However, these structures need energy storage elements to balance the instantaneous output and input power. Demanding a large size capacitor forces using an electrolytic type at the dc-link that affects the micro-inverter lifetime. This paper presents a new Active Power Decoupling (APD) circuit for the micro-inverters to reduce the capacitor size at the dc-link and utilize film capacitors instead of electrolytic types. The proposed APD circuit is based on a single-phase flyback converter. This structure is controlled based on the PQ theory and a Proportional Resonant (PR) controller for delivering the PV panel energy to the grid and eliminating the pulsation power through the switching pattern control. Simulations and experimental results of a 180 W single-phase micro-inverter prototype were performed to evaluate the performance of the proposed structure and the control scheme. It was found that this controller can accurately regulate the switching pattern to remove the ripples of input current and voltage. Furthermore, the robustness and fast dynamic performance of the proposed configuration have been confirmed during input power variation. In conclusion, this single-phase micro-inverter structure has an efficiency of ∼ 91%, THDi of 3.6%, and a long lifetime.

Flexible lead-free Na0.5Bi0.5TiO3-EuTiO3 solid solution film capacitors were fabricated. The recoverable energy storage density and energy storage efficiency reach 65.4 J/cm3 and 52 %, respectively, due to the great insulation characteristic and relaxor behaviors. And the energy storage performances for the flexible solid solution films show excellent stabilities on temperature, frequency and bending endurance, especially, with bending endurance stability over 105 cycles. The flexoelectric effect also contributes to the regulation on energy storage performances by bending the flexible films. This work provides an candidate for the flexible film capacitors with giant application potentials in wearable energy storage devices.

High-temperature dielectric polymers have a broad application space in film capacitors for high-temperature electrostatic energy storage. However, low permittivity, low energy density and poor thermal conductivity of high-temperate polymer dielectrics constrain their application in the harsh-environment electronic devices, especially under elevated temperatures. Here, the combination of dopamine functionalized MAX (Ti3AlC2) nanosheets and a polyimide (PI) matrix offers a feasible strategy to prepare high-temperature polymer nanocomposites with improved dielectric and thermal performances. The surface functionalized MAX nanosheets with dopamine has guaranteed both the increase of dielectric constant and breakdown strength, leading to improved energy storage capability. As a result, the nanocomposite with 3 wt % functionalized MAX exhibits an enhanced energy density of 2.60 J/cm3 at 30 °C, and the nanocomposite with 1 wt % fillers possess an energy density of 1.19 J/cm3 at 100 °C, more than 1.32 and 1.18 times that of neat PI films (1.97 J/cm3 at 30 °C and 1.01 J/cm3 at 100 °C). In addition, an improved in-plane thermal conductivity of 0.55 W/(m·K) is obtained for PI based nanocomposite with 7 wt % MAX@dopa, which is much higher than that of pure polymer (0.18 W/(m·K)). Our results show that surface modified MAX nanosheets can be used to construct polymer-based nanocomposites with excellent high-temperature energy storage capability and thermal properties.

The low permittivity of the polypropylene (PP) film has become a barrier for the further development of film capacitors with high energy storage density. An advanced strategy of the high-permittivity filler/polymer nanocomposite turns out to be a promising way of solving this problem. In this work, we coated ethylene propylene diene monomer (EPDM) as the shell on the surfaces of BaTiO3 successfully to fabricate core-shell structural nanoparticles. The addition of surface rubberized BaTiO3 into PP matrix promotes the permittivity to about 5.8, while the dielectric loss is barely changed as compared with PP itself. In addition, the elongation at break is as high as 364%, which is over 4 times higher than that of PP. The influences of shell thickness (3 nm, 5 nm and 7 nm) for the nanoparticles and hot-stretching process for the nanocomposite films were also carefully investigated, both of which greatly affected the properties of nanocomposites. Finally, the optimum breakdown strength as high as 370 MV/m is obtained, leading to a maximum energy density of 3.06 J/cm3, which can be attributed to both high breakdown strength and high permittivity of the core-shell structural BaTiO3/PP nanocomposites.

The development of advanced dielectric materials with high electric energy densities is of crucial importance in modern electronics and electric power systems. Herein, a kind of ternary poly(vinylidene fluoride)-based ferroelectric terpolymer nanocomposites are prepared using a facile solution cast method. The ternary nanocomposite that is composed of barium strontium titanate (BST) and boron nitride nanosheets (BNNS) can achieve increased dielectric constant and breakdown strength simultaneously. At the optimized filler contents, the ternary nanocomposite discharges an energy density of 24.4 J/cm3, which is 295% that of pristine terpolymer. Moreover, microsecond discharge speed of 2.81 μs along with a power density that is over 13 times that of the current commercial available biaxially oriented polypropylene (BOPP) have been achieved under an electric field of 200 MV/m. The incorporation of uniformly dispersed multicomponents into polymer matrix paves a way to significantly improve energy storage capability for dielectric polymer nanocomposites film capacitors.

This paper presents a new operating type of a three phase photovoltaic PID current control system connected to the low voltage distribution grid. This operating type introduces a 120-degree bus clamp PWM control method (120° BC-PWM). A 120° BC-PWM is a special switching sequences technique employing bus clamp sequences that use only one phase under a PWM and PID control state every 60° while the other phases are being clamped. The BC-PWM method was used to generate six PWM signals to control a three phase inverter system every 60° with constant power input and a small dc link film capacitor. The main objective of this paper is to use new PWM techniques with a PID current control method to reduce the switching losses of three phase inverters. The losses were reduced to 1/3th for each transistor by reducing the time operation for each transistor. The simulation results of the BC-PWM method show an improvement in the performance of the three phase inverter system connected to the grid. Simulation setup of the system obtained is built by using a SiC MOSFET, 5 kVA, 400 V line-line and 25 kHz switching frequency. The PID control is not continuously active for each phase but is operational in 60° and saturated at 120° in a half period. Following a proper tuning of the windup, it recovers very easily.

High energy density polymer nanocomposites with high-temperature resistance are quite desirable for film capacitors and many other power electronics. In this study, polyimide-based (PI) nanocomposite films containing the core-shell structured barium titanate@silicon dioxide (BT@SiO 2 ) nanofibers have been successfully synthesized by the solution casting method. In the BT@SiO 2 /PI nanocomposite films, the dielectric permittivity as well as the breakdown strength increase significantly. The SiO 2 shell layers with moderate dielectric permittivity could effectively mitigate the local field concentration induced by the large mismatch between the dielectric permittivity of BT and PI, which contributes to the enhancement of the breakdown strength of the PI nanocomposite films. As a result, the PI nanocomposite film filled with 3 vol% BT@SiO 2 nanofibers exhibits a maximal energy density of 2.31 J cm −3 under the field of 346 kV/mm, which is 62% over the pristine PI (1.42 J cm −3 at 308 kV/mm) and about 200% greater than the best commercial polymer, i.e. biaxially oriented polypropylenes (BOPP) (≈1.2 J cm −3 ). The thermogravimetric analysis results indicate that the BT@SiO 2 /PI nanocomposite films have good thermal stability below 500 °C.

Reliability-oriented problems of film capacitors are very crucial to ensure the reliable and healthy operation of power electronic converters. Capacitance and equivalent series resistance (ESR) are the typical performance characteristics (PCs) of capacitors, and their degradation processes also show certain dependence, which was almost ignored in previous researches. Besides, the degradation paths of these PCs are often nonlinear and affected by three-source uncertainties including temporal uncertainty, individual heterogeneity and measurement errors, which are rarely simultaneously considered in the existing dependent degradation models. Regardless of ignoring the dependence, nonlinearity or uncertainties in the degradation process, the reliability assessment result will be inaccurate. In this article, a new reliability assessment method for film capacitors is put forward oriented by dependent and nonlinear degradation considering three-source uncertainties. First, a random-effect nonlinear Wiener-based model with measurement errors is developed to explicitly characterize the degradation processes of capacitance and ESR. Subsequently, the appropriate Copula function is selected and employed to capture their dependence. Finally, an accelerated degradation test (ADT) on film capacitors combined with comparative analysis fully highlights the superiority of the new reliability assessment method.

Metallized-film capacitors are widely used in large capacity power electronic equipment to filter the harmonics, buffer the pulsation power and support an operating voltage. However, with the reliability design standard becoming more stringent, the demand to estimate the lifetime more precisely for capacitors surges out. Extracting the hot-spot temperature is the core step, but conventional methods could not fully consider the influence brought by internal and external stresses. Finite element method is more precise but the modification of parameters needs to be done manually, which could be time-consuming. A joint simulation method is then proposed by means of interface between different computer software. This method keeps the advantage of finite element method, taking both the aging of capacitor and the time-varying equivalent resistance into consideration, with the operations being automatically done. Hence the accuracy of hot-spot temperature estimation is improved compared to traditional ways and in the meantime, a more time-efficient reliability evaluation is fulfilled.

As the vigorous development of modern emerging electronics in multi-field, capacitors with high energy-storage performance, superior mechanical flexibility and outstanding plasticity are urgently required to satisfy pluralistic applications. Herein, we obtain an all-inorganic flexible lead-free Mn-doped 0.4Bi0.5Na0.5TiO3-0.6BiNi0.5Zr0.5O3 (BNT-BNZ) film capacitor with good plasticity fabricated on flexible Ni foil substrate via a conventional sol-gel method. The capacitor shows a desirable energy density (Wrec = 60.4 J/cm3) and high energy efficiency (η = 63.2%) with excellent temperature stability (25–205 °C), frequency stability (500–5k Hz) and antifatigue property (1 × 108 cycles), due to its great insulation characteristic and relaxor features. Moreover, high energy-storage performance remains stable under various bending radii (r) and even after 104 bending cycles at r ≈ 3 mm. And no obvious deterioration of energy-storage capability in the capacitor is observed after long-term laying in the air (12 months) and another 104 bending cycles. Such outstanding results demonstrate that the flexible BNT-BNZ film capacitor based on Ni foil substrate has potential application in the future flexible electronics. More interestingly, the BNT-BNZ film capacitor exhibits wonderful plasticity, which can be folded or compressed into various shapes, and still maintain great properties under different folding states. It undoubtedly provides more possibilities for the design of capacitor, giving them additional freedom in terms of shape or space. This study not only develops a promising candidate for flexible energy-storage device, but also, more importantly, opens up new ideas and application fields for the design and development of flexible devices.

High dielectric constant polymer composites have considerable potentials in energy storage and dielectric applications because of simple fabrication process, facile processability, light-weight, excellent thermal stability and mechanical properties. Perovskite (CsPbBr3)/polyimide (PI) composites were successfully prepared via an in-situ polymerization from CsPbBr3 precursor in polyamic acid, followed by thermal imidization. The dielectric properties of polyimide composites were controlled by adjusting the content of CsPbBr3 nanocrystals. The obtained CsPbBr3/PI composites not only possess a high dielectric constant of up to 25.5 but also exhibit low dielectric loss below 0.25. The maximal discharging energy density reached up to 3.10 J cm−3 with 10% CsPbBr3, which is almost 3 times greater than pure PI under the same conditions. In addtiton, outstanding thermal properties of 5% decomposition temperature beyond 530 °C and good mechanical properties. The CsPbBr3/PI composites can be prepared facilely and rapidly on a large scale, which will be a outstanding dielectric material for high temperature polymer film capacitors.

Film capacitors can be used as energy storage for fast storage and release energy, but the low energy density limits their applications. In our previous study, we have demonstrated that a small amount of 2D titanium dioxide (TiO2) nanobelts in PVDF could significantly enhance the energy density of these composite films. In order to increase the dielectric constant and energy density of these composites, multi-walled carbon nanotubes (MWCNTs) are introduced into these 2D TiO2 nanobelts obtained during electrospinning, and parallelly oriented along these 2D nanobelts. The shell formed by insulating TiO2 can avoid the formation of conductive network and realize high polarization efficiency. It’s shown that when the ratio of MWCNTs and TiO2 in the composite filler is 1:30, the breakdown voltage of the filler can achieve 478 kV/mm, the polarizability is 8.34 μC/cm2, and the energy density is increased from 2.87 J/cm3 to 17.97 J/cm3 comparing with neat PVDF.

Dielectric polymer capacitors with high power density as well as efficient charge-discharge rate are widely investigated in past decades. The development of polymer film with large electric capability has become the research topic for the energy storage of advanced power equipment. Here the tubular architecture in poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) composite film has been constructed with modified halloysite nanotubes (HNTs) to accomplish an effective diffusion of matter and energy units under high electric field. The nanotube surface was functionalized with poly(dopamine) (PDA) in tris-buffer solution to improve the compatibility with fluoropolymer. The energy capability of P(VDF-TrFE) composite film is enhanced owing to the large content of electroactive phase and interfacial polarization. The dielectric constant in 4 wt% PDA-HNTs/P(VDF-TrFE) film is 34.1 at 100 Hz, and the energy density in 2 wt% composite achieves 5.6 J/cm3 with charge-discharge efficiency of 74% at 250 MV/m based on the efficient transportation of ions within hollow nanotubular structure. This work delivers a simple method to construct the efficient diffusion route in polymer dielectrics for film capacitor with high energy density and cycle efficiency.

Flexible energy-storage capacitor has attracted great attention due to deformable and lightweight, which could be applied to wearable electronics, bendable smartphones. It is urgent to manufacture a capacitor combining excellent electrical properties with mechanical bending capacity. Here, flexible Pb0.97La0.02Zr0.95Ti0.05O3 (PLZT 2/95/5) films are prepared by controlled spalling technology (CST) and exhibit outstanding electrical properties with polarization about 86.3 µC/cm2 at various tensile or compressive bending radii, which indicates excellent mechanical stability of films. It is worth mentioning that recoverable energy-storage density (Wre) of films has increased by 21% at 500 kV/cm compared to the original substrate, which is caused by change in stress. Meanwhile, flexible films were measured under wide temperature range from −70–200 °C with Wre fluctuating from 9.2 J/cm3 to 17.1 J/cm3, which is related to free energy barrier of phase transition. These studies provide reference for preparation of flexible capacitors which have great potential applications for future flexible micro-devices.

Polymer-based composites act as film capacitors are an ideal candidate, but further applications are limited by the conflict between energy density and efficiency. Herein, a novel one-dimensional core–shell tubular structure of nanofillers is proposed, SiO2 surface-modified Ba0.6Sr0.4TiO3 nanotubes (BST@SiO2 NTs) are prepared by improved electrospinning and then wet chemical method. Notably, both improved dielectric properties and enhanced breakdown strength could be obtained by incorporating moderate BST@SiO2 NTs. Consequently, the 2 vol% BST@SiO2 NT/PVDF composites achieve an ultra-high Ud (discharged energy density) of ~ 18.08 J/cm3,and it is quite larger than 11.25 J/cm3 of neat PVDF. More importantly, compared to pure PVDF (59.87%), an excellent efficiency of 70.06% is also maintained. This work opens up a novel and unique sight for the structural designing of inorganic nanofillers, which is the ideal strategy to obtain high-performance dielectric composites and related potential applications.

Self-repairing behavior of SrTiO 3 film capacitor was explored to improve the energy density. With Au and Al being deposited on SrTiO 3 thin films as top electrode, the breakdown processes were investigated by a real-time optical microscope system. A high electric field of the electrode edge attributed to edge effect provided the “trigger factor” for the self-repairing behavior. Absorbed water not only provided “mobile phase” for self-repairing process which significantly enhanced breakdown strength but also, and equally important, it supplied additional polarization charges to raise dielectric constant. As a result of the concurrent increase in E b and e r , a higher energy density of 15.7 J/cm 3 is achieved. A leakage current platform was observed in the self-repairing process and the thickness of a new layer Al 2 O 3 film generated from self-repairing process was estimated according to Ohm's law and breakdown strength. Using relative humidity dependence of breakdown voltage, the maximum breakdown field was explored to realize the optimum self-repairing capability.

Electrochemical capacitors with flexible and compressible properties have attracted lots of attention due to the development of wearable electronic devices. Here the melamine sponge (MS) has been chosen as the carrier to integrate the electrodes of capacitors because of its compressible and porous structure. Two bunches of carbon fibers sewn into the middle of the MS are used as electrodes to electrochemically deposit the polypyrrole doped with anion of dodecyl benzene sulfonate, then the symmetric capacitors are obtained after the gel electrolyte of LiClO 4 /polyvinyl alcohol (LiClO 4 /PVA) is added into the pores of the MS. The performances of the electrochemical capacitor with electrodes integrated in the MS have been evaluated by electrochemical methods in different electrolytes. The results show that the capacitors exhibit better performance in LiClO 4 /PVA than in LiCl/PVA, and that the optimal capacitor can retain 98.2% capacitance after 10000 cycles, and the capacitances of the capacitors become slightly bigger under bending and compressing states compared with their normal state. The capacitors connected in parallel and series show a good electrical relationship, four cells connected in series can turn on a light emission device after being charged, indicating that the flexible capacitor exhibits potential practical application.

This paper proposes a high efficiency DC-DC flyback converter with a resonant full-bridge inverter to use in PV systems. The flyback converter is composed of a resonant active-clamp circuit that limits the voltage stress and provides zero voltage switching (ZVS) turn-on and turn-off of the power switches. Therefore, the switching losses of the high frequency primary switches are negligible. A resonant full-bridge inverter with ZVS of the high frequency switches is adopted to make the overall efficiency high. Moreover, using a film capacitor in the DC link for the power decoupling, the lifespan of the microinverter is increased. A 250 W prototype of the proposed microinverter has been implemented and the performance is analyzed with different loading condition. The feasibility analysis of the proposed topology for the PV modules in different weather condition confirms the superiority of the proposed microinverter for rooftop PV system compared with the existing topologies.

Polymer dielectrics are preferred materials for high-energy-density capacitive energy storage. In particular, high-temperature dielectrics that can withstand harsh conditions, e.g., ≥150 °C, is of crucial importance for advanced electronics and electrical power systems. Herein, high-temperature dielectric polymer composites composed of polyetherimide (PEI) matrix and hafnium oxide (HfO2) nanoparticles are presented. It is found that the incorporation of HfO2 with a moderate dielectric constant and a wide bandgap improves the dielectric constant and simultaneously reduces the high-field leakage current density of the PEI nanocomposites. As a result, the PEI/HfO2 composites exhibit superior energy storage performance to the current high-temperature engineering polymers at elevated temperatures. Specifically, the nanocomposite with 3 vol% HfO2 displays a discharged energy density of 2.82 J/cm3 at 150 °C, which is 77% higher than neat PEI. This work demonstrates the effectiveness of incorporation of the nanofiller with a medium dielectric constant into the polymer on the improvement of high-temperature capacitive properties of the polymer composites.

Ferroelectric polymers have been widely explored for film capacitor applications due to their high energy storage densities that are almost an order of magnitude greater than those of the commercial capacitor dielectrics. However, the existing ferroelectric polymers are designed exclusively for room-temperature operation, and suffer from poor capacitive performance at elevated temperature, which falls short of the need in the emerging harsh-environment applications. In this paper, we report multilayered ferroelectric polymer composites exhibiting simultaneous high energy density and high discharge efficiency at elevated temperature. The multilayered composites consist of two copolymers of polyvinylidene fluoride (PVDF) with similar chemical structures but distinct dielectric properties, where one contributes to high electrical polarization and the other offers high thermal stability and suppresses charge injection. More importantly, we demonstrate that the critical issue of charge conduction at elevated temperature in ferroelectric polymers is well tackled by the established highly miscible interlayer interfaces in the multilayered structure set up between the two electrically dissimilar phases. At 70 °C, the maximum discharged energy density above 80% discharge efficiency of the multilayered composites reaches 15.5 J/cm3, far outperforming all the existing ferroelectric polymers. This work sheds light on the design of high-energy-density ferroelectric polymers for high temperature capacitive energy storage.

In this work, we prepared the polyimide (PI) nanocomposite films containing barium titanate @polydopamine (BT@PDA) nanoparticles within a core-shell structure by solution casting method. The dielectric constant of these nanocomposite films is significantly improved compared to pure PI film, and increases with the increase of BT nanoparticles. And, the breakdown strength of these nanocomposite films is better than that of untreated BT/PI films at the fixed BT content. The PI composite film containing 1 vol% of BT@PDA nanoparticles exhibits the highest energy storage density of 1.94 J/cm3 under an electric field of 315 kV/mm, which is 42% over the pristine PI (1.37 J/cm3 at 295 kV/mm) and about 162% greater than biaxially-oriented polypropylene (BOPP) (≈1.2 J/cm3 at 640 kV/mm). The presence of PDA shell effectively improves the dispersion uniformity and interfacial compatibility of BT nanoparticles in the PI matrix, giving rise to lower local electric field distortion in the composites. Besides, the BT@PDA/PI nanocomposite films have excellent dielectric thermal stability in the temperature range from 25 to 200 °C and thermal stability up to 500 °C. The BT@PDA/PI composites fabricated in this work have a great potential to be used in the high-temperature film capacitors.

Polymer film is current the primary candidate for dielectric capacitor due to its large electric breakdown and intrinsic self-healing feature. High energy density and charge–discharge efficiency of film capacitors are urgent requirements for the miniaturization of power system with lightweight concern. Here the efficient transport tunnel has been constructed in halloysite nanotubes (HNTs)/poly(vinylidene fluoride-chlorotrifluoroethylene) (P(VDF-CTFE)) nanocomposite, in which the polar response is enhanced due to the tubular architecture serving as interior diffusion under external electric field. The HNTs/P(VDF-CTFE) nanocomposite was prepared by simple solution casting method. The dielectric property and electrical energy capability are improved after the incorporation of HNTs, for which the large free space inside tube facilitates the motions of electron and ion that contribute to the large polarization. The energy density of 1 wt% nanocomposite achieves 6.5 J/cm3 at 350 MV/m, which is ascribed to the high content of electroactive phase and enhanced electric displacement. This work provides an effective strategy for developing flexible polymer nanocomposite with high energy density, and sheds a light on the improvement of mechanism in 1D tubular structure/polymer composite for energy storage applications.

Flexible electrostatic capacitors have many potential applications in modern electric power systems. In this study, flexible cellulose-based dielectric films were prepared by compositing regenerated cellulose (RC) and one-dimensional BaTiO3 nanofiber (BTNF) via a simple and environmentally friendly process. To improve compatibility and distributional homogeneity of the fillers/matrix, BTNF was surface modified by dopamine to prepare the poly(dopamine) modified BTNF (PDA@BTNF). The obtained RC/PDA@BTNF composite films (RC-PDA@BTNF) possessed higher dielectric constant and breakdown strength than those of the RC and RC/BTNF composite films. In particular, RC/PDA@BTNF composite films with 2 vol% PDA@BTNF (RC-2PDA@BTNF) exhibited a high discharged energy density of 17.1 J/cm3 at 520 MV/m, which exceeded 40 % compared with that of RC-2BTNF at 460 MV/m. Meanwhile, RC-2PDA@BTNF could continuously work for more than 10,000 times with a high efficiency of 91 %. Furthermore, the composite films could maintain good dielectric properties for a long time when stored in vacuum condition (under 0.3 atm). Therefore, these flexible cellulose-based dielectric materials are promising in the field of novel high-performance film dielectric capacitors.

The influence of temperature on the energy storage behavior of relaxor-ferroelectric epitaxial Pb0.92La0.08Zr0.52Ti0.48O3 (PLZT) thin film capacitors fabricated using pulsed laser deposition was evaluated using cyclic current-voltage measurements from 25 °C to 225 °C in order to elucidate ferroelectric and dielectric contributions across the Curie temperature (Tc). In the film thickness range of 125 nm to 500 nm, it has been found that the leakage current through the capacitors increases monotonically with increasing temperature and the effect is more prominent at smaller film thickness, primarily due to a more efficient movement of ferroelectric domains. While these effects prevent thinner PLZT films from maintaining adequate energy storage efficiencies at temperatures above ~ 100 °C, thicker films show promising energy storage properties in a wide temperature range. Specifically, the 500 nm thick PLZT film capacitors have a nearly constant energy storage efficiency above ~ 70% in the temperature range of 25 °C to 175 °C, with a peak efficiency of 78% at 175 °C due to the large dielectric constant exceeding ~ 2000 as the temperature approaches the PLZT Tc of 200 °C. By quantifying the three contributions of the electric conductivity, dielectric capacitance, and relaxor-ferroelectric domain switching polarization to temperature dependent energy storage properties of relaxor-ferroelectric capacitors, this study reveals that the dielectric contribution dominates in the PLZT capacitors with smaller thickness, while even contributions from all three components are present in films of larger thickness. These results suggest that the PLZT relaxor-ferroelectric thin film capacitors are promising for energy storage applications and further improvement of performance may be achieved by optimization of the film/electrode interface.

Polymer dielectrics with high dielectric constant, low dielectric loss, high breakdown strength, and high temperature capability are attractive for applications such as capacitive energy-storage. Commercially available polymer dielectrics such as biaxially oriented polypropylene (BOPP), poly(ethylene terephthalate) (PET), poly(ethylene naphthalate) (PEN), polycarbonate (PC), and poly(vinylidene) fluoride (PVDF) can be just operated below 200 °C. Great effort has been put into exploring high temperature polymer dielectrics to fulfill the demand of high temperature applications, such as the aerospace and military power supply. In this study, a series of polyimides containing bipyridine units with good dielectric performance and high temperature capability were prepared by using a newly synthesized diamine monomer, (5,5′-bis [(4-amino) phenoxy]-2,2′-bipyridine (BPBPA)). These polyimides possessed high dielectric constant of the as -synthesized polyimides can be up to7.2, the dielectric loss was 3 . Furthermore, the polyimides exhibited high glass transition temperature (Tg) of 275–320 °C and tensile strengths of 175–221 MPa. These obtained polyimides promise potential applications in high temperature flexible polymer film capacitor operated at high temperature.

This paper presents a robust vision inspection system for detecting the surface defects of film capacitors. In particular, we use a novel Non-subsampled Contourlet Transform (NSCT) based algorithm to detect the surface defects. Then, the detection results are sent to the mechanical separation system via a serial port. The defective capacitors are peeled off from the production line by motor. The proposed system can improve the detection efficiency. It thus can improve the product quality and reduce production costs. Experimental results have demonstrated that the system achieves superior performance over other state-of-the-art solutions. Moreover, with the system, large-scale vision data of capacitor surfaces can be collected and used to supervise capacitor manufacturing process. HighlightsWe construct a robust vision inspection system to detect surface defects of film capacitors.We propose a effective vision-based defect detection approach based on Non-subsampled Contourlet Transform.We report the superior performance by the system compared to existing solutions.

We report the growth of ferroelectric Pb 0.92 La 0.08 Zr 0.52 Ti 0.48 O 3 (PLZT) thick films using a poly(1-vinylpyrrolidone-co-vinyl acetate) (PVP/VA)-modified sol–gel process. A per-coating thickness of ≈0.66 μm has been demonstrated using PVP/VA-modified solution, which is more than doubled that of the PLZT films grown by PVP-modified method, and nearly 6 times the per-coating thickness of films prepared by conventional sol–gel process. PLZT thick films grown on LNO/Ni substrates exhibited denser microstructure, higher remanent polarization (11 μC/cm 2 ) and dielectric tunability (45%), lower leakage current density (≈1.2 × 10 −8 A/cm 2 ), and higher breakdown strength (≈1.6 MV/cm) than those for the samples grown on PtSi substrates. These results demonstrated great potential of using PVP/VA-modified sol–gel process for high power film capacitor applications.

The solution deposition of ZrO2 thin films from a single-source precursor with oximato ligands allowed the deposition of very uniform and homogenous films. Variation of the film thickness by either employing higher precursor concentrations or the succeeding deposition of multiple layers did not lead to any observable changes in the film morphology. Measurements were carried out using scanning electron microscopy as well as white light interferometry. Detailed investigations of the electrical properties by impedance spectroscopy of capacitors revealed that the relative permittivity is not affected by the processing procedure. No influence of the particular thickness and the number of the individual layers in a stack could be determined. In all cases, the dielectric constant of the amorphous ZrO2 had a value ~ 14.8, as extracted from the impedance at 10 kHz. The method seems attractive for the application in printed electronics as it is robust against changes in the deposition conditions.

The demand for monitoring of strain is growing in high temperature and harsh environment systems. In this work, the thin film interdigitated capacitive strain gauges are fabricated using Ba 0.5 Sr 0.5 TiO 3 (BST) as the dielectric and palladium-13 wt% chromium (PdCr) alloy as the electrodes, and the strain sensing characteristics of the thin film devices are investigated. It was found that the sensors showed low values of dissipation factor and stable capacitance over the frequency range from 15 kHz to 500 kHz at different temperatures. The temperature coefficient of capacitance (TCC) has been measured for temperature ranging from 25 °C to 480 °C so that the effect of temperature on the devices is known. At low temperature less than 150 °C the TCC is very small within 20 ppm/°C. With the temperature increasing, the TCC increased rapidly, and at 480 °C, the TCC was measured to be 3100 ppm/°C while is obviously less than that of typical thick film capacitors. The gauge factor (GF) of the interdigitated capacitive strain gauge at temperatures ranging from 25 °C to 400 °C to be about 3. The gauge also exhibits good linearity and sensitivity at applied large strains.

An efficient layout technique is proposed to eliminate the effect of the bottom-plate capacitors in a C-2C Digital to Analog Converter (DAC). Using this technique, the bottom-plate capacitors of 2C capacitors in the C-2C structure are placed in parallel with 1C capacitors. Then, the effect of the bottom plate capacitors is nulled by modifying the size of the main 1C capacitors. Hence, avoiding the complexity of calibration, this technique can preclude the effect of the bottom-plate to ground capacitance. Statistical simulations prove that the proposed technique is robust to non-ideal effects such as mismatch or parasitic capacitors. A 10-bit C-2C DAC is modeled in COMSOL Multiphysics using the TSMC 90nm technology parameters to demonstrate the proposed method. Simulation results prove that the peak of INL and DNL are improved by factors of 66 and 116 compared to the conventional C-2C DAC. Moreover, using this technique multi-layer capacitors can be used along with MIM capacitors to increase the capacitance density. In a 90nm CMOS technology, the area of the capacitors in a 10-bit C-2C DAC is reduced by more than 63%.

Thermal aging is one of the main failure mechanisms in metallized polypropylene film capacitors (MPPFCs). Also, catastrophic failure is more likely to happen under elevated working temperature. Elevated temperature will accelerate the aging process of the dielectric, reduce the dielectric strength of polypropylene and influence the self-healing characteristics of metallized polypropylene film (MPPF). In this paper, the lifetime of MPPFCs under different voltage and working temperature is tested, and with a well-designed self-healing experiment bench, self-healing experiment under 20 °C, 40 °C, 60 °C and 85 °C are performed. It is found that the lifetime decreases and catastrophic failure rate increases apparently with the rise of temperature. And the self-healing energy under the same breakdown voltage becomes larger under higher temperature. In this paper, the influence of temperature on self-healing characteristics and capacitor working performance are investigated.

Due to the growing energy demands, it is highly desirable to concurrently improve the thermal conductivity and dielectric breakdown strength of dielectric film capacitors. Polyvinylidene fluoride (PVDF) is hitherto regarded as a most satisfactory alternative for dielectric capacitors but with relatively low thermal conductivity and dielectric breakdown strength. Herein, a major contribution is made to the concurrent enhancement of PVDF-based thermal conductivity and dielectric properties. It can be readily achieved through the incorporation of as-prepared high-quality few-layered boron nitride nanosheets (BNNSs) with a minimized loading (defined as PVDF-BNNSs). BNNSs dispersion with intact structure and a large aspect ratio is prepared by a unique mild mechanical stirring process assisted by dimethyformamide/1-butanol (DMF/1-butanol) solvent and a low power ultrasonic. Encouragingly, the characteristic breakdown strength with a maximum value of 334 MV/m reaches for PVDF-BNNSs composite only with 3 vol% BNNS loading, to be 1.6 times of pure PVDF. It also presents a high discharged energy density up to 9.9 J cm-3, along with an efficiency of 68.3%. Synchronously, the thermal conductivity accomplishes a high value of 1.12 W/m·K with only 8 vol% BNNS loading. A further theoretical analysis reveals that high-quality appropriate BNNSs loading could be preferentially arranged in parallel with PVDF surface. It indicates that BNNSs have good interface compatibility with PVDF, thus to improve its associated performances concurrently.

The energy storage density of the film capacitor is crucial for optoelectronic devices. Among various dielectrics, polyvinylidene-fluoride-co-hexafluoropropylene (PVDF-HFP) copolymer is widely preferred due to its inherent high dielectric constant and breakdown strength. However, the low energy storage density and high dielectric loss (tan δ) of PVDF-HFP remains challenging in the present scenario. In this work, we demonstrated how to improve the dielectric constant and energy density of PVDF-HFP with low dielectric losses by formulating PVDF-HFP/Lanthanum Zirconium Oxide (LZO) composite ink at low temperature. We performed the computational modeling of the thin-film capacitor, consisting of PVDF-HFP/LZO as a dielectric layer, to find the optimum LZO content for achieving a high energy density. A computational model of the film capacitor and dielectric shielding was built with PVDF-HFP/LZO composites having a different LZO content to understand its effect on the electric field distribution, polarization, and energy storage density. We compared the dielectric properties of the PVDF-HFP/LZO thin-film capacitor predicted by simulations with the experimental values measured by impedance analysis. The optimum LZO content in PVDF-HFP was determined as 15 vol% to achieve a high energy storage density of 15.8 J/cm3 at 545 MV/m breakdown strength with low dielectric losses. Dielectric constant and energy storage density of the PVDF-HFP/LZO15 composite film were nearly doubled compared to that of neat PVDF-HFP by keeping dielectric losses low.