Search

Li-ion capacitor as a kind of new-style energy storage devices has attracted growing attention due to its high power and energy density. In this study, the stereoscopic honeycomb-like porous carbon nanofiber (PCNF) was used as a carrier of TiO 2 nanoparticles via simple immersion and calcination. The equally distributed anatase TiO 2 nanoparticles filling in the stereoscopic honeycomb-like PCNF skeleton provided large reaction sites, and the stereoscopic honeycomb-like PCNFs acting as support materials offered shorter electrical paths. The composite material presented unique fiber morphology, high specific surface area (268.32 m2g-1) and preferable electrical conductivity (1.31 S cm−1) which was used as an anode in Li-ion capacitor, and the large energy density versus power density (69.46 Wh kg−1 at 0.15 kW kg−1, 18.33 Wh kg−1 at 30 kW kg−1) and good cycle stability (retains 79.4% after 4000 cycles at 1 A g−1) were achieved, which had broad application prospect in the energy storage field. • A stereoscopic honeycomb-like PCNF loading TiO 2 nanoparticles material is designed. • The TiO 2 nanoparticles uniformly distribute and fill in stereoscopic carbon skeleton. • The stereoscopic honeycomb-like PCNF skeleton offers electrical conductivity to TiO 2. • The LIC with TiO 2 @PCNF anode exhibits good electrochemical properties. [ABSTRACT FROM AUTHOR]

• A novel multifunctional interlayer is successfully prepared. • The prepared interlayer mainly contains N-doped porous carbon nanofibers and Mg-Al layered double hydroxides. • The interlayer can suppress the "shuttle effect" and accelerate the redox reaction kinetics. • The Li-S battery with the MALDH@NPCNFs interlayer shows stable long-term cycle performance. [Display omitted] Lithium-sulfur (Li-S) battery as a promising energy storage technology has attracted extensive concern. However, their practical performance is seriously limited by the dissolution and diffusion of long-chain polysulfides. In this study, a multifunctional cathodic interlayer was constructed, which composed by Mg-Al layered double hydroxides (MALDHs) modified N-doped honeycomb-like porous carbon nanofibers (NPCNFs). The NPCNFs in the prepared interlayer can combine the physical confinement of the porous structure and the chemical role of the nitrogen atoms to suppress the dissolved lithium polysulfide (LiPS). Furthermore, highly conductive interlayer contains NPCNFs can be regarded as a second current collector, and the hierarchical pores is beneficial to adapt the volume change during the redox process. More importantly, the obtained polar MALDHs not only can strongly interact with LiPS by chemical combination, but also enhance the redox kinetics by forming cooperative interface. As a result, the Li-S cells with the cathodic interlayers obtains a high initial discharge capacity of 1452 mAh g−1 at 0.2 C, superior rate capability up to 2 C rate with a capacity of 952 mAh g−1 and excellent long-term cycling stability by maintaining a low average capacity fading (0.065% per cycle) during 500 cycles at 1 C. Therefore, the interlayer contains MALDH@NPCNFs has extraordinary potential to be used in high-performance Li-S batteries. [ABSTRACT FROM AUTHOR]

Owing to high energy density, lithium sulfur (Li–S) battery is regarded as one of the most promising candidates for future energy storage. However, "shuttle effect" and sluggish redox kinetics of lithium polysulfides impede its practical application. Herein, a novel g-C 3 N 4 /Co-based MOFs derived chestnut-like superstructure (Co/CNT@DCNS) was prepared to act as the component of interlayer through a low-temperature one-step carbonization strategy. The prepared superstructure was constructed by the strong catalysis of 0D Co nanoparticles, high conductivity of 1D CNTs and excellent polysulfides adsorption of 2D defect C x N y nanosheets, which could not only ensure the rapid electrons/ions transport and fast redox kinetics, but also provide sufficient spaces for accommodating the volume expansion of active materials. Therefore, the cells with the prepared interlayer exhibited stable performances with an initial capacity of 1348.3 mAhg−1 and an extended cycling stability of 0.04% per cycle during the 1000 cycles at 1C. Even at a high sulfur loading of 3.1 mg cm−2, a specific capacity of 691.7 mAh g−1 can be maintained after 500 cycles at 0.5C. This work shares a convenient and safe strategy for the synthesis of multi-dimension, dual-functional and stable superstructure interlayer for advanced Li–S batteries. Image 1 [ABSTRACT FROM AUTHOR]