SOLID ELECTROLYTE MATERIAL FOR LITHIUM ION BATTERY, SOLID ELECTROLYTE FOR LITHIUM ION BATTERY, LITHIUM ION BATTERY, AND METHOD FOR PRODUCING SOLID ELECTROLYTE MATERIAL FOR LITHIUM ION BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a sulfide-based solid electrolyte material for a lithium ion battery, excellent in lithium ion conductivity.SOLUTION: A solid electrolyte material for a lithium ion battery of the present embodiment contains Li, P and S, as constituent elements. In the solid electrolyte material of the present embodiment, the molar ratio (Li/P) of the content of the Li relative to the content of the P is 3.4 or more and 4.2 or less, and the molar ratio (S/P) of the content of the S relative to the content of the P is 3.5 or more and 4.5 or less.