Method for producing sulfide solid electrolyte and sulfide solid electrolyte

Abstract

The present invention provides a method for producing a sulfide solid electrolyte capable of enhancing solubility of a raw material when producing the sulfide solid electrolyte by a melting method. The present invention relates to a method for producing a sulfide solid electrolyte containing at least one element of Sn, Si and Sb by heating and melting a sulfide solid electrolyte raw material containing at least one element of Sn, Si and Sb in a gas atmosphere containing a sulfur element and cooling and solidifying the obtained melt, wherein the heating and melting increases the valence of the element contained in the sulfide solid electrolyte raw material.