Sulfide-based solid electrolyte, method for producing the sulfide-based solid electrolyte, and method for producing all-solid-state battery
Provided is a method for producing a sulfide-based solid electrolyte with a balance between the ion conductivity of the sulfide-based solid electrolyte and the heat generation amount of an electrode layer containing the sulfide-based solid electrolyte during an electrode reaction. Disclosed is a method for producing a sulfide-based solid electrolyte comprising a sulfide glass-based material that contains at least one lithium halide compound selected from the group consisting of LiI, LiBr and LiCl, the method comprising immersing the sulfide glass-based material, which is at least one sulfide glass-based material selected from the group consisting of a sulfide glass and a glass ceramic, in an organic solvent having a solubility parameter of 7.0 or more and 8.8 or less, for 1 hour to 100 hours.
1. A method for producing a sulfide-based solid electrolyte comprising a sulfide glass-based material that contains at least one lithium halide compound selected from the group consisting of LiI, LiBr and LiCl,
the method comprising immersing the sulfide glass-based material, which is at least one sulfide glass-based material selected from the group consisting of a sulfide glass and a glass ceramic, in an organic solvent having a solubility parameter of 7.0 or more and 8.8 or less, for 1 hour to 100 hours,
wherein the organic solvent is at least one selected from the group consisting of butyl butyrate, diethyl ether, cyclohexane, toluene, chlorotoluene, hexyl acetate, n-pentane, and n-octane, and
wherein, when the sulfide glass-based material is a sulfide glass, the method further comprises heating the sulfide glass at a temperature higher than a crystallization temperature (Tc) of the sulfide glass, which is a temperature observed by thermal analysis measurement, thereby obtaining a glass ceramic.
2. The method for producing the sulfide-based solid electrolyte according to claim 1 , wherein the organic solvent is butyl butyrate.
3. A method for producing an all-solid-state battery comprising a cathode layer that contains the sulfide-based solid electrolyte obtained by the production method defined by claim 1 .