固体电解质颗粒密度对固态电池故障的影响
Mouhamad S Diallo1, Tan Shi1, Yaqian Zhang1
1Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.
Nature communications
|January 29, 2024
概括
固态电池 (SSB) 可以在固体电解质密度超过95%时避免短路. 在此下方,密度的增加加速了树的生长和这些先进电池的故障.
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
- 电池技术 电池技术
背景情况:
- 固态电池 (SSB) 的能量密度和安全性高于离子电池.
- 树的透和短路是SSB中的关键故障模式.
研究的目的:
- 为了研究固体电解质密度和丝成长之间的关系.
- 确定关键密度值,以防止SSB中的树岩形成.
主要方法:
- 使用聚焦离子束扫描电子显微镜断层扫描对微结构性质 (孔隙性,孔隙连接性,扭曲性) 的量化.
- 透性测试用于评估电解质特性.
- 在不同尺寸 (0.22微米) 的毛孔内建模丝的生长.
主要成果:
- 在固体电解质颗粒中,丝的生长被抑制,其相对密度大约超过95%.
- 在95%密度值以下,密度增加会加速丝的生长,并由于孔隙透而导致短路.
- 微观结构分析揭示了影响树传播的关键性质.
结论:
- 固体电解质密度是一个关键参数,可以防止SSB中的树形成.
- 实现相对密度高于95%对于设计更安全,无石固态电池至关重要.
- 了解孔隙结构及其与密度的关系为SSB设计和故障缓解提供了指导方针.
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