增材策略增强高压金属电池的现场聚合均性
Jian Ma1, Mengyue Yu1, Minghao Huang1
1School of Materials Science and Engineering, Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei, Anhui, 230009, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|September 27, 2023
概括
一种新型的添加剂N-甲基-N-(trimethylsilyl) trifluoroacetamide (MSTFA) 解决了高压金属电池的现场聚合电解质中的气体残留问题,提高了性能和稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 在现场聚合为金属电池 (SMB) 中的准固体电解质提供了优势,这是由于密切的电极接触和工艺兼容性.
- 在聚合过程中产生的气体可以导致电解质不均,并降低当前准固体电解质的电化学性能.
- 高压中小企业需要稳定的电解质,能够承受恶劣的条件并防止退化.
研究的目的:
- 为高压中小企业应对现场聚合电解质废气的挑战.
- 引入和评估一种新型的多功能添加剂N-甲基-N-(三甲基) 三乙胺 (MSTFA),用于改善准固体电解质特性.
- 提高高压中小企业的电化学性能和循环稳定性.
主要方法:
- 开发一种基于聚乙烯碳酸的准固体电解质,使用现场聚合.
- 将N-甲基-N-三甲) 三乙胺 (MSTFA) 作为多功能添加剂.
- 使用优化的电解质对金属电池 (SMB) 进行电化学表征,包括在高电压 (4.4V) 上进行循环测试.
主要成果:
- MSTFA有效地塑化了电解质,减少了残留气体,并创造了具有更快离子导电性的均质,更柔软的电解质.
- MSTFA 作为 HF/H2O 的清除剂,减轻阴极腐蚀和界面层降解,从而提高高压循环稳定性.
- 带有优化电解质的NajijiNa3V2(PO4) 2F3电池在0.5C100次循环后实现了112.0mAhg-1的初始放电容量和91.3%的容量保留.
结论:
- 这项研究开创了针对中小企业的现场聚合电解质的气体残留问题.
- 多功能锡兰添加剂MSTFA显著提高了高压中小企业的电解质均性,离子导电性和电化学性能.
- 这些发现表明MSTFA在开发下一代金属电池的先进准固体电解质方面具有实际意义.
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