DIPHOSPHORUS PENTASULFIDE COMPOSITION FOR SULFIDE-BASED INORGANIC SOLID ELECTROLYTE MATERIAL

摘要

The purpose of the present invention is to provide a diphosphorus pentasulfide composition from which a sulfide-based inorganic solid electrolyte material having improved lithium ion conductivity can be obtained.　The present invention pertains to a diphosphorus pentasulfide composition for a sulfide-based inorganic solid electrolyte material, the diphosphorus pentasulfide composition having a molar ratio (S/P) of 2.40-2.49 which is the content of sulfur (S) to the content of phosphorus (P), wherein in a DSC curve of the diphosphorus pentasulfide composition, obtained by measurement using a differential scanning calorimeter under the conditions of a starting temperature of 25°C, a measurement temperature in the range of 30-350°C, a heating rate of 5°C/min, and an argon atmosphere of 100 ml/min, the DSC curve has an endothermic peak in the temperature range of 280-300°C, and the full width at half maximum of the endothermic peak is at least 4.1°C.