Al<sub>2</sub>O<sub>3</sub>/PEI复合介质的高温储能特性研究

doi:10.11896/cldb.23110021

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Abstract High temperature energy storage dielectric materials are of great significance for improving the capacity and reliability of electronic and power equipment, as well as reducing their volume. In this work, aluminum oxide/polyether imide (Al₂O₃/PEI) composite films were obtained via solution blending and casting method using high-temperature resistant PEI as the matrix and Al₂O₃ with wide bandgap as the fillers. The effects of alumina nanoparticles (AO NPs) and electrospun alumina nanofibers (AO NFs) on the dielectric energy storage characteristics of the composite films were studied comparatively. The results show that Al₂O₃ can improve polarization and breakdown strength simultaneously, as well as decrease conductivity. Compared with AO NPs, AO NFs are more evenly dispersed in the PEI matrix, thus obtaining high energy storage Al₂O₃/PEI composite films at extremely low filler content. When the filler content is 0.50%, the energy storage density of AO NFs/PEI at 25 ℃ reaches 5.80 J/cm³, which is 1.2 and 2.5 times higher than that of 0.50AO NPs/PEI and pure PEI films, respectively. Furthermore, 0.50AO NFs/PEI composite films still exhibit excellent energy storage characteristics at 150 ℃, with energy storage density and charge discharge efficiency of 4.36 J/cm³ and 75%, respectively.

Key words： polyetherimide alumina nanofibers high temperature dielectric property energy storage density

Published: 25 November 2024 Online: 2024-11-22

CLC number:

TB332

Fund:Natural Science Foundation of Heilongjiang Province (LH2019E059) and theNational Natural Science Foundation of China (U20A20307).

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	Articles by authors
	MENG Lingxin
	DENG Wei
	HU Siyuan
	FENG Jiawei
	WANG Zhaopan

Cite this article:

MENG Lingxin,DENG Wei,HU Siyuan, et al. Research on High Temperature Energy Storage Characteristics of Al₂O₃/PEI Dielectric Composites[J]. Materials Reports, 2024, 38(22): 23110021-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23110021 OR http://www.mater-rep.com/EN/Y2024/V38/I22/23110021

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