Jiangheng Jia, Zhizhan Dai, Song Ding, Yiwei Wang, Shengchun Shen, Ying Hou, Yuewei Yin, Xiaoguang Li
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引用次数: 0
Abstract
Low energy density of polymer film capacitors is regarded as one of the most serious drawbacks facing growing demands for equipment integration and miniaturization. Herein, ultraviolet light and ozone (UVO) surface modification is utilized to simultaneously improve dielectric constant and breakdown strength of polyethylene (PE) films. As a result, after 3 minutes of UVO treatment, an enhanced recoverable energy density of 4.79 J/cm with a charge-discharge efficiency of >95% is obtained under 650 MV/m at room temperature (RT). Significantly, stable energy storage performance under 200 MV/m maintains throughout a broad temperature range from -90°C to 90°C and during 20000 cycles of charge-discharge procedures. According to first-principles calculations and thermally stimulated depolarization current measurements, formation of carbonyl groups (C=O) after UVO treatment could effectively passivate initial deep-level defect states caused by H vacancies, which explains the improvement in capacitive energy storage. Moreover, the metalized UVO-modified PE exhibits valuable breakdown self-clearing ability, and the self-cleared specimen maintains stable energy storage performance over 20000 cycles at 200 MV/m and RT. This work offers an effective and user-friendly method for enhancing comprehensive dielectric characteristics of PE-based materials, potential for applications in modern power systems and electronic devices.
期刊介绍:
Materials Today Energy is a multi-disciplinary, rapid-publication journal focused on all aspects of materials for energy.
Materials Today Energy provides a forum for the discussion of high quality research that is helping define the inclusive, growing field of energy materials.
Part of the Materials Today family, Materials Today Energy offers authors rigorous peer review, rapid decisions, and high visibility. The editors welcome comprehensive articles, short communications and reviews on both theoretical and experimental work in relation to energy harvesting, conversion, storage and distribution, on topics including but not limited to:
-Solar energy conversion
-Hydrogen generation
-Photocatalysis
-Thermoelectric materials and devices
-Materials for nuclear energy applications
-Materials for Energy Storage
-Environment protection
-Sustainable and green materials