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Abstract

A method of producing a sulfide solid electrolyte having high ionic conductivity and high thermal stability without complicating the production process is provided, by a method of producing a sulfide solid electrolyte containing: mixing a raw material inclusion containing at least one type selected from a lithium atom, a sulfur atom, and a phosphorus atom, and a complexing agent having 2 or more of hetero atoms in the molecule to obtain an electrolyte precursor; mixing the electrolyte precursor in a solvent containing an oxygen atom-containing compound having a relative permittivity of 3.2 or higher at 25° C.; obtaining a grinding treatment product by performing grinding treatment of the mixture; and removing the solvent from the grinding treatment product to obtain a sulfide solid electrolyte.

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First Claim