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在没有储的固态电池中,导电丝引起的故障

Se Hwan Park¹, Abhinand Ayyaswamy², Jonathan Gjerde³

¹Andlinger Center for Energy and the EnvironmentPrinceton University, Princeton, New Jersey 08540, United States.

ACS energy letters

|March 20, 2025

概括

没有储的固态电池由于断裂和丝生长而失效. 较高的堆压力会导致表面断裂,导致电池短路.

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:

固态电池提供了安全优势,但由于电力短路而导致故障.
断裂和金属丝的形成是无储固态电池的关键故障机制.
固体电解质表面的机械应力,来自电化学和机械来源,诱导骨折并促进丝的生长.

研究的目的:

调查应用堆压力如何影响无储固态电池的故障机制.
了解表面粗度,堆压力和应力发展之间的相互作用.
确定导致过早短路的关键因素.

主要方法:

电化学实验电化学实验
3D同步成像 3D同步成像
中等尺度建模.

主要成果:

低堆压力导致不规则的涂层和高局部电流密度,驱动故障.
较高的堆压力促进了统一的涂层,但在表面口产生了高拉伸应力.
固体电解质表面的状特征在高拉伸应力下断裂,导致过早短路.

结论:

堆压力显著影响固态电池的故障模式.
优化表面形态和控制堆压力对于提高电池可靠性至关重要.
了解表面特征的应力度是防止短路故障的关键.

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