一个XPS研究电解质的离子电池在全细胞LNMOvsSi/石墨电解质
Raheleh Azmi1, Fredrik Lindgren1, Killian Stokes-Rodriguez1,2
1Department of Chemistry - Ångström Laboratory, Structural Chemistry, Uppsala University, Box 538, Uppsala 751 21, Sweden.
ACS applied materials & interfaces
|June 21, 2024
概括
多盐电解质为高压离子电池提供了最佳的整体性能,提供了卓越的长期电极被动化. 与共同溶剂和基线电解质相比,它表现出更好的接口稳定性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 高压离子电池需要稳定的电解质来防止电极降解.
- 了解固体电解质界面 (SEI) 和阴极电解质界面 (CEI) 对电池寿命至关重要.
研究的目的:
- 为了评估配溶剂和多盐电解质的高压 LiNi0.5Mn1.5O4 石灰/石墨全电池.
- 为了比较它们的性能与标准的碳酸盐基电解质.
- 分析SEI和CEI在电池性能上的形成和影响.
主要方法:
- 具有不同电解质的全细胞的电化学循环.
- 现场死后的X射线光电子光谱 (XPS) 分析电极.
- 对电极交叉电话和腐蚀的分析.
主要成果:
- 基线电解质显示持续的SEI/CEI增长和显著的电极交叉交谈.
- 同溶剂电解质形成稳定的CEI,并有效减少交叉电话.
- 多盐电解质形成无机丰富,最薄的SEI/CEI,但表现出Al腐蚀.
- 多盐电解质显示出最佳的整体性能和长期被动化.
结论:
- 电解质选择显著影响高压电池中的SEI/CEI形成和稳定性.
- 接口厚度是电池性能的一个关键因素,可能比交叉通话缓解更重要.
- 多盐电解质在高压应用中显示出长期被动化的前景.
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