在金属阳极上调节稳定的固体电解质间相
Chong Yan1,2, Hao-Ran Li3, Xiang Chen3
1School of Materials Science & Engineering , Beijing Institute of Technology , Beijing 100081 , China.
Journal of the American Chemical Society
|May 24, 2019
概括
了解电双层是稳定的固体电解质间相 (SEI) 形成的关键. 这项研究将SEI化学与双层结构相关联,改善电池寿命.
科学领域:
- 电化学
- 材料科学
- 电池技术
背景情况:
- 电池的稳定性取决于固体电解质相间层 (SEI).
- 电双层 (EDL) 在金属阳极-电解质接口之前形成SEI.
- 了解EDL规则对于安全电池的SEI结构和稳定性至关重要.
研究的目的:
- 将SEI界面化学与纳米级Li表面吸附EDL相关联.
- 研究电解质添加剂在形成强大的EDL结构中的作用.
- 阐明受EDL影响的SEI形成机制.
主要方法:
- 界面化学的理论和实验分析.
- 用酸 (LiNO3) 和化铜 (CuF2) 修改金属阳极电解质.
- 在内赫尔姆霍尔茨平面上竞争性离子吸附的研究.
主要成果:
- 微量LiNO3和CuF2添加剂在金属上产生强大的EDL结构.
- -NO3复合物优先吸附和减少以形成SEI.
- 经过修改的电极在500个循环中显示99.5%的平均库伦比效率.
结论:
- 这项研究确立了Li+溶解与电极接口形成之间的联系.
- 这些发现使得可以设计稳定的SEI层,用于长期使用的高容量电池.
- 这项工作为工作电池的接口现象提供了基本的见解.
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