COMPOSITE POSITIVE ELECTRODE FOR ALL-SOLID-STATE BATTERY, MANUFACTURING METHOD THEREFOR, AND ALL-SOLID-STATE BATTERY THEREOF

A composite positive electrode is disclosed, as well as a method for making the composite positive electrode and an all-solid-state battery including the composite positive electrode. The composite positive electrode includes: a plurality of sulfur particles having an average particle size from 5 µm to 10 µm; a plurality of sulfur-containing solid electrolyte particles of formula Li6PS5X, wherein X = Cl, Br, or I; and a conductive material including a plurality of acetylene black carbon particles. The acetylene black carbon particles have a mean particle size from 10 nm to 100 nm, a BET specific surface area from 50 m2g-1 to 150 m2g-1, and a para-crystalline structure. The sulfur particles, sulfur-containing solid electrolyte particles, and conductive material are ball milled to form a milled mixture; and pressured to form the composite positive electrode.