Air exposure towards stable Li/Li₁₀GeP₂S₁₂ interface for all-solid-state lithium batteries

Abstract Moist air is a great challenge for manufacturing sulfide-based all-solid-state lithium batteries as the water in will lead to severe decomposition of sulfide electrolytes and release H 2 S gas. However, different with direct reaction water, short-period exposure Li 10 GeP 12 electrolyte controlled humidity can greatly enhance stability against metal, thus realizing stable based metal batteries. During exposure, partial hydrolysis occurs on surface pellets, rapidly generating protective layer 4 P 6 , GeS HPO 3 dozens seconds. This ionically conductive but electronically insulation protecting effectively prevent interface between during electrochemical cycling. The Li/40s-air-exposed /Li cell shows long cycling 1000 h. And LiCoO /40s-air-exposed present good rate capability cyclic performances, showing capacity retention 80% after 100 cycles.