期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202108805
关键词
air sensitivity; batteries; degradation mechanisms; halide; solid state electrolytes; water stability
类别
资金
- National Natural Science Foundation of China [52072138]
- Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, on the ALD experiment
Halide solid state electrolytes have been attracting attention due to their simple synthesis, high ionic conductivity, and good softness. This study focused on the degradation evolution of typical halide SSEs upon moisture exposure, finding that both Li3InCl6 and Li3YCl6 are prone to water absorption and deterioration, with different rates and amounts of water absorption due to differences in solubility. The study also revealed the degradation mechanism of halide SSEs and the potential for improving air stability through surface coating.
Halide solid state electrolytes (SSEs) have attracted the attention of researchers as a new family of SSEs due to simple synthesis, high ionic conductivity, and good softness. However, until now, most of the reported works are focused on promotion of ionic conductivity, and little attention is paid to their air stability and degradation mechanism upon exposure. Herein, the degradation evolution of typical halide SSEs upon moisture is investigated in detail. It is found both Li3InCl6 and Li3YCl6 halide SSEs are easy to absorb water and deteriorate, and the air sensitivity is closely related to the contact area with air. In comparison, the water absorption rate of Li3InCl6 is faster than that of Li3YCl6, while the amount of water absorption of Li3YCl6 is larger than that of Li3InCl6, due to the higher solubility of InCl3 compared to YCl3. Along with water absorption, Li3InCl6 first forms a crystalline hydrate, then partially decomposes to InCl3 and LiCl, and InCl3 further hydrolyzes and produces acid which is corrosive; finally In2O3 impurities are formed. Coating the surface of Li3InCl6 with Al2O3 can effectively improve the air stability. This work can help to understand the degradation mechanism of halide SSEs and provide guidance for the future design of new halide SSEs.
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