文献类型：期刊文献

英文题名：Enhancing energy storage performance of polyethylene via passivation with oxygen atoms through C-H vacancy carbonylation

作者：Jia, Jiangheng[1,2];Dai, Zhizhan[1,2];Ding, Song[1,2];Wang, Yiwei[1,2];Shen, Shengchun[1,2];Hou, Ying[3];Yin, Yuewei[1,2];Li, Xiaoguang[1,2,4]

机构：[1]Univ Sci & Technol China, Hefei Natl Res Ctr Phys Sci Microscale, Dept Phys, Hefei 230026, Peoples R China;[2]Univ Sci & Technol China, CAS Key Lab Strongly Coupled Quantum Matter Phys, Hefei 230026, Peoples R China;[3]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[4]Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China

年份：2024

卷号：42

外文期刊名：MATERIALS TODAY ENERGY

收录：;EI(收录号：20241315815698);WOS:【SCI-EXPANDED(收录号:WOS:001219159900001)】；

基金：This work was supported by the National Natural Science Foundation of China (U21A2066, 52125204, and 52272109) , the National Key Research and Development Program of China (2022YFB3807604 and 2022YFB3807602) , and the Funda- mental Research Funds for the Central Universities (WK2030000070) , and this work was partially carried out at the USTC Center for Micro and Nanoscale Research and Fabrication.

语种：英文

外文关键词：Capacitor; Breakdown strength; Self-clearing; Surface modification

摘要：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 min of UVO treatment, an enhanced recoverable energy density of 4.79 J/cm(3) 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 is maintained throughout a broad temperature range from -90 degrees C to 90 degrees C and during 20,000 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 20,000 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 and potential for applications in modern power systems and electronic devices. (c) 2024 Elsevier Ltd. All rights reserved.