NOVELTY - Manufacture of sulfide solid electrolyte material involves heating ion-conductive material synthesized by performing amorphization process using raw material composition containing lithium sulfide, phosphorus pentasulfide, and sulfide of tetravalent element. The sulfide solid electrolyte material contains element (M1) chosen from lithium, sodium, potassium, magnesium, calcium and zinc, element (M2) chosen from phosphorus, antimony, silicon, germanium, tin, boron, aluminum, gallium, indium, titanium, zirconium, vanadium, niobium and lithium, phosphorus element and sulfur element.    USE - Manufacture of sulfide solid electrolyte material (claimed). Uses include but are not limited to lithium cell used as power supply for video camera, mobile telephone, communication apparatus, electric vehicle and hybrid vehicle.    ADVANTAGE - The method effectively provides sulfide solid electrolyte material having high lithium-ion conductivity. The sulfide solid electrolyte material produces reduced amount of hydrogen sulfide during exposure. The battery containing the sulfide solid electrolyte material has favorable output characteristics.    DETAILED DESCRIPTION - Manufacture of sulfide solid electrolyte material involves synthesizing ion-conductive material by performing amorphization process using raw material composition containing lithium sulfide, phosphorus pentasulfide, and single unit or sulfide of tetravalent element, and heating the ion-conductive material, such that obtained sulfide solid electrolyte material has ratio of diffraction intensity of peak at 2 theta of 27.33 degrees plus minus 0.5 degrees and diffraction intensity of peak at 2 theta of 29.58 degrees plus minus 0.5 degrees , of 1 or less. The sulfide solid electrolyte material contains element (M1), element (M2), phosphorus element and sulfur element, and has a peak at 2 theta of 29.58 degrees plus minus 0.5 degrees based on X-ray diffraction measurement using copper K-( alpha )-ray. The element (M1) is chosen from lithium, sodium, potassium, magnesium, calcium and zinc. The element (M2) is chosen from phosphorus, antimony, silicon, germanium, tin, boron, aluminum, gallium, indium, titanium, zirconium, vanadium, niobium and lithium. The ratio of phosphorus pentasulfide and raw material other than phosphorus pentasulfide in the raw material composition satisfies relation: M1(4-x)M2(1-x)PxS4 (I), where x is more than 0 to less than 1. An INDEPENDENT CLAIM is included for sulfide solid electrolyte material.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view explaining the manufacture of sulfide solid electrolyte material. (Drawing includes non-English language text)