期刊
CERAMICS INTERNATIONAL
卷 47, 期 17, 页码 25009-25016出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.05.229
关键词
PVDF; Composite films; Energy storage; Na0 5Bi0 5TiO3 platelets
资金
- National Natural Science Foundation of China [51772177]
- Shaanxi Science and Technology Co-ordination and Innovation Project [2017TSCXLGY0805]
- Science Fund for Distinguished Young Scholars of Shaanxi Province [2018JC029]
By designing bilayer composite films with NBT platelets in the lower layer, the dielectric constant and breakdown strength were increased, leading to a significant improvement in discharge efficiency and energy density at 650 MV m-1. This new strategy provides insights for the development of high-performance capacitors.
Polymer-based dielectric composites with enhanced energy storage performances occupy a pivotal position in the modern power electronics industry. Unfortunately, these dielectric composite materials still exist unsolvable problems, especially the deficient breakdown strength (Eb) and heat amassment caused by dielectric loss. Herein, the novel bilayer composite films comprised of pristine poly(vinylidene fluoride) (PVDF) as the top layer and Na0.5Bi0.5TiO3 (NBT)/PVDF composite doped with two-dimensional (2D) NBT platelets as the bottom layer were designed and prepared. Subsequently, the dielectric and energy storage properties of these bilayer structure composite films were analyzed. The results demonstrate that this bilayer structure with optimized NBT content increases the dielectric constant, enhances the Eb, and reduces the dielectric loss, thus notably improving discharged efficiency (I) and discharged energy density (Ue). Eventually, an ultrahigh I of 80.3% and a superior Ue of 22.6 J cm-3 are gained at 650 MV m-1 with the composite layer involving 5 vol% 2D NBT platelets. Therefore, this new strategy of simultaneously increasing the Ue and I of the composite film will provide new thoughts for the exploitation of high-performance capacitors.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据