Ultrahigh discharge efficiency and improved energy density in polymer-based nanocomposite for high-temperature capacitors application. (March 2021)

• Record Type: Journal Article
• Authors: Chen, Hanxi; Pan, Zhongbin; Wang, Weilin; Chen, Yuyun; Xing, Shuang; Cheng, Yu; Ding, Xiangping; Liu, Jinjun; Zhai, Jiwei; Yu, Jinhong
• Is Part Of: Composites. Volume 142(2021)
• Publication Date: 2021-03
• Subjects: A. Polymer-matrix composites (PMCs) -- A. Nano particles -- B. Electrical properties -- B. Dielectricity -- B. High-temperature properties; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2020.106266
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: Electrostatic capacitors with excellent energy storage capacity and great thermal stability have become the researching focus. However, high-energy–density electrostatic capacitors are restricted through insurmountable drawbacks of low charge–discharge efficiency under high temperature/voltage working conditions. Herein, polyetherimide (PEI) nanocomposite films contains with two-dimensional boron nitride nanosheets (h-BNNS) are fabricated by solution casting method. Consequently, h-BNNS/PEI nanocomposite films exhibit tremendously breakdown strength ( E b ~ 700 MV/m), accompany with a record discharge efficiency ( η ~ 93.6%) at room temperature with filler content of 4 vol%. The simulations and experiments results suggest that the h-BNNS loading into the PEI matrix could efficiently improve the high-temperature endurance. Particularly, the composites films exhibit superior comprehensive capacitive properties, e.g., discharged energy density of 3.43 J/cm 3 along with η of 90.1% under 500 MV/m and 150 °C. Therefore, these characteristics render our polymer film an ideal material candidate for high-performance dielectric applications at evaluated temperature.