METHOD FOR MANUFACTURING A PHOSPHORUS SULFIDE COMPOSITION FOR SULFIDE-BASED INORGANIC SOLID ELECTROLYTE MATERIAL

Provided is a phosphorus sulfide composition for a sulfide-based inorganic solid electrolyte material, the phosphorus sulfide composition including PS and PS, in which when a total content of PS, PS, PS, and PS in the phosphorus sulfide composition is represented by 100 mass%, a content of PS calculated from a solid P-NMR spectrum is 70 mass% or more and 99 mass% or less.