SULFIDE SOLID ELECTROLYTE MANUFACTURING METHOD

Provided is a method for producing a sulfide solid electrolyte, the method including a first step of mixing a raw material-containing substance that contains a lithium atom, a phosphorus atom, a sulfur atom, and a halogen atom in an organic solvent to prepare a mixture, a second step of irradiating the mixture with a microwave of 0.5 to 700 W/g to heat the mixture to 50 to 360° C., and a third step of cooling the mixture to 20 to 70° C., the second and third steps being repeated 2 to 50 times. In the method for producing a sulfide solid electrolyte, a liquid phase method is adopted with a lowered heating temperature, and a sulfide solid electrolyte that has a particle size maintained by suppressing granulation caused by heating and further has a high quality can be efficiently produced.