| abstract |
A method for producing a composite active material includes a preparation step of preparing composite particles comprising active material particles and an oxide solid electrolyte coating at least a part of the surfaces of the active material particles, wherein the active material particles comprise lithium, oxygen and at least one selected from the group consisting of cobalt, nickel, and manganese; and a coating step of mixing the composite particles and a crystalline sulfide solid electrolyte while controlling a temperature of a mixture of the composite particles and the sulfide solid electrolyte to be no greater than 58.6° C. and while applying an energy to the mixture such that the sulfide solid electrolyte undergoes plastic deformation, such that the surfaces of the composite particles are coated with the sulfide solid electrolyte. |