一种高化酸主要盐,为稳定的金属电池提供动力
Guansheng Chen1,2,3,4, Lixin Qiao1,2,3, Gaojie Xu1,2,3
1Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
Angewandte Chemie (International ed. in English)
|March 13, 2024
概括
一种新的盐, perfluoropinacolatoborate (LiFPB),可以提高金属电池在高温和高电压下的性能. 它形成保护界面,改善循环稳定性,并使在极端条件下运行成为可能.
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:
- 像LiPF6这样的传统盐在苛刻的条件下与金属电池 (LMB) 的水分敏感性和热不稳定性作斗争.
- 高压和高温操作对于推进LMB的实际应用至关重要,但受到当前电解质限制的阻碍.
研究的目的:
- 为了合成和评估一种新的盐, perfluoropinacolatoborate (LiFPB),以提高LMB性能.
- 研究LiFPB的热和电化学稳定性及其对电极介面相的影响.
- 为了证明LiFPB在高电压和高温下实现稳定的LMB循环的有效性.
主要方法:
- 合成具有高化和酸盐功能组的 perfluoropinacolatoborate (LiFPB) .
- 在高压和高温条件下,对基于LiFPB的电解质在LiCoO2/Li金属电池中的电化学测试.
- 使用表面表征技术分析阴极和阳极相间形成.
主要成果:
- FPB具有卓越的热和电化学稳定性,在高温和高电压下不会产生HF.
- 在LiCoO2上,LiFPB促进了保护性阴极电解质界面 (CEI) 和在Li阳极上形成固体电解质界面 (SEI).
- 使用LiFPB的LiCoO2/Li金属电池具有出色的循环稳定性 (在60°C,4.45V的260个循环后保持80%),并在100°C工作.
结论:
- 新型LiFPB盐在高压和高温条件下显著提高了金属电池的稳定性和性能.
- FPB的离子结构在形成稳定的接相和实现快速离子导电方面发挥着至关重要的作用.
- FPB是下一代高性能金属电池的一个有前途的电解质组件.
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