Patent ID: 11152641

Abstract:
Provided is a sulfide solid electrolyte material which has a composition that does not contain Ge, while having a smaller Li content than conventional sulfide solid electrolyte materials, and which has both lithium ion conductivity and chemical stability at the same time. A sulfide solid electrolyte which has a crystal structure represented by composition formula (Li3.45+β−4αSnα)(Si0.36Sn0.09)(P0.55−βSiβ)S4 (wherein α≤0.67, β≤0.33 and 0.43<α+β (provided that 0.23<α≤0.4 when β=0.2 and 0.13<α≤0.4 when β=0.3 may be excluded)), or a crystal structure represented by composition formula Li7+γSiγP1−γS6 (wherein 0.1≤γ<0.3).