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The main factors that limit the practical application of bismuth ferrite-based energy storage ceramics are their low breakdown electric field strength and large remnant polarization. Here, we achieve high energy storage behavior in (0.72-x)BiFeO 3 -0.28BaTiO 3 -xLa(Mg 1/2 Zr 1/2)O 3 (BF-BT-xLMZ) ferroelectric ceramics through directional defect modulation based on a transformation of the conductance mechanisms. The systematic experimental analysis coupled with the vacancy sink model suggests that the introduction of LMZ changes the trap-filled-limit conduction mode dominated by oxygen vacancy, leading to 4 times enhancement of the breakdown electric field in BF-BT-0.2LMZ. Meanwhile, the induced nanodomains create a size effect that effectively reduces the remnant polarization, resulting in an increase in efficiency by 3.5 times. As a result, the recoverable energy storage density of the ceramic reaches an outstanding 4.2 J/cm3, together with a high efficiency of 75.2%. This work provides a feasible strategy for the development of ferroelectric family in the field of high-energy storage. [ABSTRACT FROM AUTHOR]

Dielectric capacitors with high power densities are crucial for pulsed electronic devices and clean energy technologies. However, their breakdown strengths (Eb) strongly limit their power densities. Herein, by modifying the interfacial polarization by adjusting the difference in activation energies (Δϕ) between the grain and grain boundary phases, the significant enhancement of Eb in the (1‐x)(0.94Na0.5Bi0.5TiO3‐0.06BaTiO3)‐xCa0.7La0.2TiO3 (NBT‐BT‐xCLT, x = 0, 0.18, 0.23, 0.28, 0.33, 0.38, and 0.43) ceramics is achieved. The results indicate that adding CLT introduces a super‐paraelectric state, refines grain size, and, most importantly, decreases the Δϕ value. When Δϕ is tuned close to zero in the specific NBT‐BT‐0.38CLT sample, a significant boost in Eb value of 64 kV mm−1 is obtained. As a result, the recoverable energy storage density of the ceramics reaches an unprecedented giant value of 15.1 J cm−3 together with a high efficiency of 82.4%, as well as ultrafast discharge rate of 32 ns, and high thermal and frequency stability. The results demonstrate that interfacial polarization engineering holds huge promise for the development of dielectrics with high‐energy‐storage performance. [ABSTRACT FROM AUTHOR]

To meet the growing demand in energy, great efforts have been devoted to improving the performances of energy–storages. Graphene, a remarkable two-dimensional (2D) material, holds immense potential for improving energy–storage performance owing to its exceptional properties, such as a large-specific surface area, remarkable thermal conductivity, excellent mechanical strength, and high-electronic mobility. This review provides a comprehensive summary of recent research advancements in the application of graphene for energy–storage. Initially, the fundamental properties of graphene are introduced. Subsequently, the latest developments in graphene-based energy–storage, encompassing lithium-ion batteries, sodium-ion batteries, supercapacitors, potassium-ion batteries and aluminum-ion batteries, are summarized. Finally, the challenges associated with graphene-based energy–storage applications are discussed, and the development prospects for this field are outlined. [ABSTRACT FROM AUTHOR]

To meet the growing demand in energy, great efforts have been devoted to improving the performances of energy–storages. Graphene, a remarkable two-dimensional (2D) material, holds immense potential for improving energy–storage performance owing to its exceptional properties, such as a large-specific surface area, remarkable thermal conductivity, excellent mechanical strength, and high-electronic mobility. This review provides a comprehensive summary of recent research advancements in the application of graphene for energy–storage. Initially, the fundamental properties of graphene are introduced. Subsequently, the latest developments in graphene-based energy–storage, encompassing lithium-ion batteries, sodium-ion batteries, supercapacitors, potassium-ion batteries and aluminum-ion batteries, are summarized. Finally, the challenges associated with graphene-based energy–storage applications are discussed, and the development prospects for this field are outlined.