在固态电池中操作轴应力和接口的空间和时间跟踪
Simon Mičky1,2, Erik Šimon1,3, Juraj Todt4
1Center for Advanced Materials Application, Dúbravská cesta 9, Bratislava, 845 11, Slovakia.
Small (Weinheim an der Bergstrasse, Germany)
|December 3, 2023
概括
固态电池由于机械应力而面临导电性损失. 这项研究量化了循环过程中的应力分布,揭示了降解和体积变化,以改进电池设计.
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:
- 固态电池比液体电解质电池具有优势,但会遭受离子导电性损失.
- 这种损失主要是由电池循环期间体积变化的机械应力引起的,导致组件分层.
- 了解固态电池内部的实时应力演变对于其发展至关重要.
研究的目的:
- 为了研究在固态电池运行过程中机械应力的时空分布.
- 将这些应力与观察到的降解现象和组件体积变化相关联.
- 建立一种实时监测固态电池中化学机械过程的方法.
主要方法:
- 使用操作扫描高能X射线衍射 (XRD) 来测量横截面轴应力.
- 实现了10μm的空间分辨率,用于详细的应力映射.
- 监测了阴极中的单元细胞体积变化和阳极附近的降解.
主要成果:
- 在电池循环过程中,观察到压力分布在时间上的非单调演变.
- 确定了阳极旁边固态电解质的降解.
- 追踪了阴极单元体积的周期性变化,与循环相关.
结论:
- 开发的操作式XRD技术为化学机械诱导的压力和接口演变提供了实时的洞察力.
- 这种方法对于理解固态电池的降解机制是有价值的.
- 这些发现为优化固态电池设计和性能提供了一个平台.
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