材料科学
聚酰亚胺
纳米复合材料
电介质
储能
聚合物
兴奋剂
纳米颗粒
复合材料
聚合物纳米复合材料
复合数
化学工程
光电子学
纳米技术
工程类
功率(物理)
物理
量子力学
图层(电子)
作者
Ziwei Li,Hongmei Qin,Jinhui Song,Wei Wang,Xiaolin Zhang,Shan Wang,Chuanxi Xiong
出处
期刊:Polymers
[MDPI AG]
日期:2022-07-19
卷期号:14 (14): 2918-2918
被引量:14
标识
DOI:10.3390/polym14142918
摘要
Advanced polymer dielectrics with high energy density at elevated temperatures are highly desired to meet the requirements of modern electronic and electrical systems under harsh conditions. Herein, we report a novel polyimide/magnesium oxide (PI/MgO) nanodielectric that exhibits high energy storage density (Ue) and charge–discharge efficiency (η) along with excellent cycling stability at elevated temperatures. Benefiting from the large bandgap of MgO and the extended interchain spacing of PI, the composite films can simultaneously achieve high dielectric constant and high breakdown strength, leading to enhanced energy storage density. The nanocomposite film doped with 0.1 vol% MgO can achieve a maximum Ue of 2.6 J cm−3 and a η of 89% at 450 MV m−1 and 150 °C, which is three times that of the PI film under the same conditions. In addition, embedding ultralow content of inorganic fillers can avoid aggregation and facilitate its large-scale production. This work may provide a new paradigm for exploring polymer nanocomposites with excellent energy storage performance at high temperatures and under a high electric field.
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