对于全固态金属电池的Ce/O共同替代策略增强了硫化物电解质的稳定性
Miaoyi Zhao1,2,3, Jie Zhang1,2,3, Lihua Pu4
1School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, P. R. China.
Small methods
|May 22, 2025
概括
这项研究引入了一种使用和氧气稳定硫化物固体电解质的新方法,提高了空气稳定性和金属电池性能. 增强的电解质可以防止有害气体的释放和树岩的形成,使电池更安全,更持久.
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 (SSEs) 为所有固态金属电池 (ASSLB) 提供高离子导电性.
- 商业化受到水解和树生长的H2S生成的阻碍.
- 现有的SSE缺乏足够的结构完整性和空气稳定性来实现实际应用.
研究的目的:
- 开发一种新的Ce/O共同替代策略,以稳定阿吉罗类型的SSE.
- 提高SSE的结构完整性,空气稳定性和离子导电性.
- 为了提高SSEs和金属阳极之间的界面稳定性.
主要方法:
- 通过Ce/O共同替代合成的化类型Li5.4+xP1-xCexS4.4-2xO2xCl1.6固体电解质.
- 具有特征的结构性质,离子导电性和空气稳定性 (H2S排放).
- 在使用LiNbO3@NCM622阴极的ASSLB中评估了电化学性能,包括临界电流密度和循环稳定性.
主要成果:
- 优化的Li5.42P0.98Ce0.02S4.36O0.04Cl1.6电解质实现了7.13mS cm-1.1的离子导电性.
- 证明了出色的空气稳定性,显著减少了H2S排放 (0.36厘米3g-1在30%RH下30分钟后).
- 实现了高临界电流密度1.3mA cm-2和稳定的化/剥离超过5000小时;ASSLB在300个循环后显示99.49%的容量保留.
结论:
- Ce/O共同替代有效地稳定了阿尔吉罗狄特结构,并增强了离子导电性.
- 开发的SSE具有卓越的空气稳定性和与金属阳极的界面兼容性.
- 这一战略为开发高性能,实用的全固态金属电池铺平了道路.
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