在LiFSI电解质中研究阴极电流采集器的腐蚀行为
Zijie Yuan1, Yongjing Wang1, Yaqi Chen1
1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China.
ChemSusChem
|April 18, 2024
概括
电流采集器腐蚀加速了离子电池的老化,特别是使用LiFSI电解质. 离子透导致AlF3的形成,导致表面裂和减少电池寿命.
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
- 电池技术 电池技术
背景情况:
- 循环衰老显著影响离子电池寿命.
- 电流收集器腐蚀在电池退化中的作用尚未完全理解.
- 的天然膜通常可以防止电解质腐蚀,但也有例外.
研究的目的:
- 为了研究基于LiFSI的电解质中的电流收集器腐蚀.
- 了解腐蚀的机制和影响因素.
- 为开发先进的离子电池提供见解.
主要方法:
- 腐蚀的电化学分析.
- 腐蚀与循环时间和潜力的相关性.
- 表面物种和形态特征的表征.
主要成果:
- 的腐蚀电流随着循环时间和应用潜力而增加.
- 化物离子穿透被动化层,形成化 (AlF3).
- 形成AlF3会导致内部体积变化和表面裂.
结论:
- 电流采集器腐蚀是电池老化的一个关键因素,特别是在LiFSI电解质.
- 了解AlF3的形成是缓解腐蚀的关键.
- 这些发现支持使用LiFSI开发高能和高功率的离子电池.
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