原子扩散性:全固态电池合金阳极的临界电流密度和循环稳定性的关键描述因素
Guoyong Xue1,2, Jie Lu1,2, Zhe-Tao Sun3
1School of Chemistry and Chemical Engineering, in-situ Center for Physical Sciences, Shanghai Electrochemical Energy Device Research Center (SEED) and Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
Journal of the American Chemical Society
|October 18, 2025
概括
合金阳极改善了全固态电池 (ASSLB) 的沉积. 在LiGa阳极中的高扩散性使得记录临界电流密度 (CCD) 实现稳定的ASSLB性能.
科学领域:
- 材料科学
- 电化学
- 电池技术
背景情况:
- 合金阳极为没有树的全固态电池 (ASSLB) 提供了潜力.
- 在ASSLB中,电流合金阳极的临界电流密度 (CCD) 不足以适用于实际应用.
- 对于ASSLB的合金阳极中控制CCD的因素尚未完全理解.
研究的目的:
- 为ASSLB开发一种解释合金阳极的临界电流密度 (CCD) 的模型.
- 确定控制沉积行为和电池性能的关键参数.
- 优化合金阳极设计以提高ASSLB的稳定性和效率.
主要方法:
- 提出了一个扩散控制的沉积模型.
- 使用多模式表征来分析原子扩散性.
- 使用LiGa合金阳极和Li6PS5Cl固体电解质制造和测试的ASSLB.
主要成果:
- 合金阳极中的原子扩散性被确定为CCD和循环稳定的关键描述因素.
- 合金阳极显示了超过50 mA cm-2的创纪录的CCD.
- 具有LiGa阳极的ASSLB在1000个周期内表现稳定,容量保持80%.
结论:
- 原子扩散性是控制合金阳极中的沉积的关键因素.
- 开发的扩散控制模型为ASSLB性能提供了统一的描述符.
- 合金阳极显著促进了实用,高性能ASSLB的发展.
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