Qixiong Zhang,Zhibiao Zhu,Jiujun Zhu,Hai Jiang,Yafei Hou,Jing Cuan,Weiping Li
The growing demand for renewable energy storage has highlighted the demand of dielectric capacitors with high performances. While multilayer composites show promise by combining insulation layers and polarization layers, their performance optimization remains challenging due to complex layers number and insulation/polarization volume content dependent behaviors. This work presents an optimized multilayer composite via spatial structure design that strategically combines the Ni(OH) 2 @PDI/P(VDF-HFP) (NPP) insulation layers and Ni(OH) 2 /P(VDF-HFP) (NP) polarization layers. Through precise regulation of layers number and NPP volume content within the multilayer composite, the optimized interlayer interfacial effects, the coupling effects of insulation and polarization layers, as well as the related intralayer contributions result in a significantly discharged enhanced energy storage density of 32.1 J/cm 3 and a high charge-discharge efficiency of 80.7 % at 705.7 MV/m for the 4 layers 62.5 vol% NPP/NP composite. Our findings provide both fundamental insights into multilayer dielectric design and a practical strategy for developing high-capacity energy storage dielectrics for renewable energy storage applications .
Ruixuan Zhao,Mingyang Gao,Jiajun Chen,Weijie Yi,Huijun Li,Peicheng Wang,Zejin Tian,Xiaomin Wang
Transition metal layered oxides have emerged as a prominent class of cathode materials for sodium-ion batteries. However, their cycling stability remains a critical limitation impeding further development. Recent studies confirm that lithium incorporation effectively improves the long-term cycling performance of these materials. However, constrained by the inferior initial capacity and rate capability it induces, this approach has never achieved practical and widespread application. Hence, a novel P2-Na 0.67 Li 0.1 Ni 0.23 Mn 0.62 Zr 0.05 O 2 cathode material is proposed. The structural stability of the cathode material is significantly improved through the formation of a surface Zr O polarized layer that effectively suppresses lattice oxygen loss. Simultaneously, the transition metal vacancy concentration was modulated through controlled Zr 4+ doping levels, enabling enhanced initial capacity via optimized cationic/anionic redox participation. The in situ/ex situ characterization of the system demonstrated that it achieved dynamic confinement of anionic redox activity during the entire charge-discharge process, thereby enabling reconstruction of the oxygen reaction pathways. The modified samples exhibited enhanced electrochemical performance with 152.3 mAh g −1 at initial cycling and 99.1 mAh g −1 at 10C. This work presents a novel strategy for transition metal layer optimization and dynamic confinement of lattice oxygen activity, while providing new insights for the development of layered oxide cathode for high-performance SIBs.
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