参考电极揭示了对金属/固体电解质接口循环和高电流密度和面积容量的排空行为的见解
Karl Larson1, Eric A Carmona1, Paul Albertus1
1Chemical and Biomolecular Engineering, Maryland Energy Innovation Institute, University of Maryland, 8136 Paint Branch Drive, College Park, Maryland 20742, United States.
ACS applied materials & interfaces
|October 13, 2023
概括
一个新的金属参考电极揭示了固态电池中的关键界面不稳定性. 该方法量化了高电流密度如何导致显著的电压变化和接触面积的损失,这对电池性能至关重要.
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:
- 固态电池需要固体金属电极和固体电解质之间的稳定接口来实现高能量密度.
- 在高电流密度下了解接口行为对于电池性能和安全至关重要.
研究的目的:
- 在对称的Na金属/β′′/Na金属电池中引入和使用 (Na) 金属参考电极.
- 在高电流密度的和剥离过程中研究界面极化和接触力学.
主要方法:
- 使用一个三电极对称电池设置与一个Na金属参考电极.
- 进行电流坡道和单向测试,以评估接口稳定性和电压变化.
- 使用二维模型将接口潜力与接触面积损失相关联.
主要成果:
- 在~3 mA cm-2.2以上的脱离电流密度下,接口极化变得不稳定.
- 在高电流密度下,在剥离电极上观察到显著的电压升高 (100s mV).
- 单向测试显示~40%的Na薄膜转移失败和大量的极化持续数小时.
- 模型表明,电化学活性接触面积损失>80%对应于100s的mV界面电位上升.
结论:
- 一个Na金属参考电极为两电极测试中没有看到的界面行为提供了关键的定量见解.
- 高电流密度导致显著的界面极化和失去活跃的接触面积.
- 这种方法阐明了在固体电极/电解质接口上的合电化学和机械过程,这对于先进的电池开发至关重要.
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