材料科学
纳米复合材料
介电常数
复合材料
聚醚酰亚胺
电介质
带隙
电容感应
电容器
聚合物
光电子学
电气工程
电压
工程类
作者
Lulu Ren,Jingqi Qiao,Can Wang,Wenyue Zheng,He Li,Xuetong Zhao,Lijun Yang,Ruijin Liao
标识
DOI:10.1016/j.mtener.2022.101161
摘要
Since the promotion of the concept of nanodielectrics, the composite approach has long been considered as an effective way to improve the energy density of electrostatic capacitor films for energy storage applications. However, the selection criteria of nanofiller are blur in spite of multifarious attempts, such as Al2O3, HfO2, BaTiO3, TiO2, MnO2, MgO, etc. This paper is devoted to demonstrating the priority consideration of bandgap and permittivity in the filler selection of capacitive nanocomposite. The antagonistic effect between the bandgap and permittivity of fillers in the capacitive nanocomposite was revealed by the study of the physicochemical, dielectric, electric breakdown, and capacitive energy storage properties of polyetherimide (PEI) nanocomposites, i.e., PEI/ZrO2, PEI/SiO2, and PEI/TiO2 nanocomposites with systematically varied bandgap and permittivity. It is found that the ZrO2 nanofillers combine a wide bandgap and moderate permittivity; hence, the corresponding PEI/ZrO2 nanocomposite shows the highest discharged energy density over PEI/SiO2 and PEI/TiO2 nanocomposite. Specifically, the PEI/ZrO2 nanocomposite exhibits a maximum discharged energy density of 6.15 J/cm3 at an optimal filler content of 3 vol%, which is 57.7% higher than that of neat PEI.
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