SOLID-STATE BATTERY POSITIVE ELECTRODE MATERIAL, PRODUCTION METHOD FOR SOLID-STATE BATTERY POSITIVE ELECTRODE MATERIAL, ALL-SOLID-STATE LITHIUM-SULFUR BATTERY USING SOLID-STATE BATTERY POSITIVE ELECTRODE MATERIAL, AND PRODUCTION METHOD FOR ALL-SOLID-STATE LITHIUM-SULFUR BATTERY USING SOLID-STATE BATTERY POSITIVE ELECTRODE MATERIAL

摘要

[Problem] To provide: a positive electrode material for producing a lithium-sulfur solid-state battery that does not experience degradation of battery performance from charging/discharging cycling, does not present the fire risk of liquid electrolytes, and thereby makes battery performance compatible with safety; an all-solid-state lithium-sulfur battery that uses the positive electrode material; and a production method. [Solution] A lithium-sulfur solid-state battery positive electrode material that contains: sulfur; a conductive material; a binder; and an ionic liquid or a solvate ionic liquid. An all-solid-state lithium-sulfur battery that includes: a positive electrode that comprises the positive electrode material; a negative electrode; and an oxide solid electrolyte. The positive electrode material is manufactured by means of a method wherein a slurry obtained by adding an organic solvent to the sulfur, the conductive material, the binder, and the ionic liquid or solvate ionic liquid is applied to one surface of an oxide solid electrolyte formation body and dried to remove the organic solvent. Said method makes it possible to manufacture a positive electrode material that is adhered to a solid electrolyte and to reduce interface resistance between a positive electrode and a solid electrolyte and improve battery function.