SULFIDE SOLID ELECTROLYTE MATERIAL, SULFIDE GLASS, SOLID-STATE LITHIUM BATTERY, AND METHOD FOR PRODUCING SULFIDE SOLID ELECTROLYTE MATERIAL

An object of the present invention is to provide a sulfide solid electrolyte material having a high Li ion conductivity. The present invention solves the above-mentioned problem by providing a sulfide solid electrolyte material comprising Li, P, I and S, having peaks at 2¸ = 20.2° and 23.6°, not having peaks at 2¸ = 21.0° and 28.0° in an X-ray diffraction measurement using a CuK± ray, and having a half width of the peak at 2¸ = 20.2° of 0.51° or less.