运行调查固体电解质相间形成,动态进化和涂/脱落过程中的降解
Mihail R Krumov1, Shuangyan Lang1, Lucas Johnson1
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States.
ACS applied materials & interfaces
|September 26, 2023
概括
这项研究揭示了固体电解质介相 (SEI) 如何影响金属电池的性能. 了解SEI稳定性是设计更安全,更持久,更快充电池的关键.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 电池技术 电池技术
背景情况:
- 固体电解质介相 (SEI) 对于金属电池的稳定性和性能至关重要.
- 鉴于SEI的薄弱,动态和敏感性质,对其进行描述是具有挑战性的.
研究的目的:
- 在SEI的形成和降解过程中直接探测SEI的电子导电性.
- 了解SEI特性与板剥离行为之间的关系.
主要方法:
- 扫描电化学显微镜 (SECM) 用于表面电子导电.
- 操作电化学石英晶体微平衡 (EQCM) 用于质量变化.
- 外置X射线光电子光谱 (XPS) 用于组合分析.
主要成果:
- 在0.5V与Li/Li+相比,观察到稳定的阳极被动,独立于在1.0V以上的离子分解电位.
- 发现涂层脱落导致SEI破裂.
- 涂层剥离过程中的电流效率与SEI阳极稳定性相关.
结论:
- 电子导电性和稳定性对电池性能至关重要.
- 板剥离导致的SEI破裂突出了相互依赖的关系.
- 获得的洞察力可以指导用于先进金属电池的坚固SEI层的设计.
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