固体电解质间相的溶解及其对金属阳极循环性的影响
Philaphon Sayavong1, Wenbo Zhang2, Solomon T Oyakhire3
1Department of Chemistry, Stanford University, Stanford, California 94305-6104, United States.
Journal of the American Chemical Society
|May 23, 2023
概括
固体电解质间相 (SEI) 在电解质中的溶解度显著影响金属阳极 (LMA) 的容量损失. 尽量减少SEI溶解是改善电池循环和寿命的关键.
科学领域:
- 材料科学
- 电化学
- 电池技术
背景情况:
- 金属阳极 (LMA) 对高能量密度电池至关重要.
- 在LMA中,容量损失主要是由于固体电解质间相 (SEI) 的形成和生长.
- 目前尚不完全了解SEI在产能下降中的作用,特别是其解散行为.
研究的目的:
- 系统地量化和比较由不同的以太基电解质形成的SEI.
- 建立SEI溶解性,阳极被动性和电池循环性之间的相关性.
- 阐明影响SEI溶解性的因素及其对LMA性能的影响.
主要方法:
- 在操作中的电化学石英晶体微平衡 (EQCM) 用于实时SEI质量监测.
- 用于SEI组合分析的X射线光电子光谱 (XPS).
- 核磁共振 (NMR) 光谱用于电解质和SEI组件分析.
主要成果:
- 在以太基电解质中的SEI可溶性被系统量化.
- 在SEI溶解性,阳极被动性和电化学循环性能之间发现了直接的相关性.
- SEI溶解被认为是导致电解质性能差异的主要因素.
- 显示可溶性取决于SEI的组成和电解质特性.
结论:
- SEI溶解是限制金属阳极性能和寿命的关键因素.
- 了解和控制SEI溶解度对于设计稳定的电解质至关重要.
- 这项研究为减少容量损失和提高电池循环稳定性提供了关键见解.
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