硫化物固体电解质的表面化屏蔽,以提高全固态电池的电化学稳定性
Kyu Tae Kim1, Jae-Seung Kim2, Ki Heon Baeck1
1Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
Advanced materials (Deerfield Beach, Fla.)
|June 23, 2025
概括
表面化增强了硫化物固体电解质的稳定性,用于所有固态电池. 这一改进提高了电池的性能和安全性,为实际应用铺平了道路.
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
- 固态化学 固态化学
背景情况:
- 硫化物固体电解质具有高离子导电性,但缺乏电化学稳定性,阻碍了全固态电池 (ASSB) 的开发.
- 硫化物电解质的电化学稳定性有限,限制了ASSBs的全部潜力.
研究的目的:
- 为Li6PS5Cl固体电解质开发一种易于表面化策略.
- 提高ASSB的电化学稳定性和性能.
主要方法:
- 使用XeF2进行Li6PS5Cl的表面化,这是一个可扩展的干燥工艺.
- 使用X射线光电子光谱,X射线瑞特维尔德精细化,核磁共振和DFT计算进行了表征.
- 在LiNi0.90Co0.05Mn0.05O2半电池和袋式ASSB中进行电化学测试.
主要成果:
- 在Li6PS5Cl上形成了一个均的37.3nm化层,保留了82.8%的初始Li+导电率.
- 化机制涉及表面氧化副产品和F替代,创建一个强大的阴极电解质介相.
- 化Li6PS5Cl显著提高了ASSB中的放电能力,容量保留和安全性.
结论:
- 表面化是一种有效的策略,可以提高Li6PS5Cl电解质的电化学稳定性.
- 开发的方法为改善ASSB性能和安全提供了一个可扩展的方法.
- 这项工作展示了使用改性硫化物电解质的实用,高性能ASSB的潜力.
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