Superior energy storage performance of PVDF-based composites induced by a novel nanotube structural BST@SiO2 filler

• Published in: Composites. Part A, Applied science and manufacturing Applied science and manufacturing, 2021-06, Vol.145, p.106375, Article 106375
• Main Authors: Xiong, Xiaoying, Zhang, Qilong, Zhang, Zhao, Yang, Hui, Tong, Jianxi, Wen, Jingyang
• Format: Article
• Language: English
• Subjects: A: 1D nanotubes; A: Core–shell; B: Efficiency; B: Energy density
• ISSN: 1359-835X; 1878-5840
• DOI: 10.1016/j.compositesa.2021.106375

Polymer-based composites act as film capacitors are an ideal candidate, but further applications are limited by the conflict between energy density and efficiency. Herein, a novel one-dimensional core–shell tubular structure of nanofillers is proposed, SiO2 surface-modified Ba0.6Sr0.4TiO3 nanotubes (BST@SiO2 NTs) are prepared by improved electrospinning and then wet chemical method. Notably, both improved dielectric properties and enhanced breakdown strength could be obtained by incorporating moderate BST@SiO2 NTs. Consequently, the 2 vol% BST@SiO2 NT/PVDF composites achieve an ultra-high Ud (discharged energy density) of ~ 18.08 J/cm3,and it is quite larger than 11.25 J/cm3 of neat PVDF. More importantly, compared to pure PVDF (59.87%), an excellent efficiency of 70.06% is also maintained. This work opens up a novel and unique sight for the structural designing of inorganic nanofillers, which is the ideal strategy to obtain high-performance dielectric composites and related potential applications.