基于的固态电池:电化学和机械指导设计和操作
Pooja Vadhva1, Adam M Boyce1,2, Anisha Patel3
1Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, London WC1E 7JE, United Kingdom.
ACS applied materials & interfaces
|August 30, 2023
概括
这项研究模拟了固态电池 (SSB) 中的应力,以提高电极性能. 优化操作条件和固体电解质特性可以提高循环寿命,防止下一代电池的接口故障.
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
- 机械工程 机械工程
背景情况:
- 固态电池 (SSB) 为离子技术提供了替代方案,但面临着电阻接口和空隙形成等挑战.
- 这些接口问题导致由于断裂和分层而导致周期寿命缩短,阻碍了广泛采用.
研究的目的:
- 研究基于的SSB中的固体电解质 (SE) 和电极接口的应力演变.
- 将化学机械特性与电化学反应联系起来,以优化SSB的设计和制造.
- 了解施加压力和C-rate对薄膜SSB应力,应变和容量的影响.
主要方法:
- 为连续尺度模拟开发了一个2D化工机械模型.
- 模拟分析了薄膜SSB与无形负极的应力应变反应.
- 该模型结合了化诱导的膨胀,扩散和电极内的度梯度.
主要成果:
- 在中离子扩散会产生度梯度,导致局部应变和界面应力.
- 在适度的C-率和低施加压力下运行,在100%充电状态下 (SOC) 降低了界面应力和应变.
- 定制SE机械特性,如模量和屈服强度,可以减轻应力并优化细胞性能.
结论:
- 在优化薄膜SSB性能方面,SE材料的选择至关重要.
- 考虑机械性能和操作条件对于提高SSB循环寿命和防止界面退化至关重要.
- 这种建模方法为设计强大高效的基于的固态电池提供了指导.
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