High energy density and efficiency achieved in nanocomposite film capacitors via structure modulation

被引:15
作者
Zeng, Yi [1 ]
Shen, Zhong-Hui [1 ]
Shen, Yang [1 ]
Lin, Yuanhua [1 ]
Nan, Ce-Wen [1 ]
机构
[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
基金
中国国家自然科学基金;
关键词
TITANATE/POLY(VINYLIDENE FLUORIDE) NANOCOMPOSITES; ENHANCED BREAKDOWN STRENGTH; POLYMER NANOCOMPOSITES; DISCHARGE EFFICIENCY; HIGH-PERMITTIVITY; STORAGE; PERFORMANCE; COMPOSITES; BLENDS; NANOFIBERS;
D O I
10.1063/1.5012006
中图分类号
O59 [应用物理学];
学科分类号
摘要
Flexible dielectric polymer films with high energy storage density and high charge-discharge efficiency have been considered as promising materials for electrical power applications. Here, we design hierarchical structured nanocomposite films using nonlinear polymer poly(vinylidene fluoride-HFP) [P(VDF-HFP)] with inorganic h-boron nitride (h-BN) nanosheets by electrospinning and hot-pressing methods. Our results show that the addition of h-BN nanosheets and the design of the hierarchical multilayer structure in the nanocomposites can remarkably enhance the charge-discharge efficiency and energy density. A high charge-discharge efficiency of 78% and an energy density of 21 J/cm(3) can be realized in the 12-layered PVDF/h-BN nanocomposite films. Phase-field simulation results reveal that the spatial distribution of the electric field in these hierarchical structured films affects the charge-discharge efficiency and energy density. This work provides a feasible route, i.e., structure modulation, to improve the energy storage performances for nanocomposite films. Published by AIP Publishing.
引用
收藏
页数:4
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