▎ 摘　　要

NOVELTY - Composite negative electrode comprises negative electrode material, binder, conductive agent, lithium ion conductor, and lithium salt. USE - Composite negative electrode for solid-state battery (claimed) e.g. lithium ion battery used in electric automobile. ADVANTAGE - The composite negative electrode improves lithium ion conductivity of cathode pole piece by solid electrolyte. The composite cathode for solid state battery is applied to solid battery. It can exhibit high discharge capacity and long cycle performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included fo preparation method of composite cathode for solid state battery by preparing cathode slurry; adding binder in dimethyl formamide, N-methyl-2-pyrrolidinone or water, conductive agent, cathode material, lithium ion conductor and lithium salt; dispersing and stirring to obtain cathode slurry; preparing cathode pole piece; coating cathode paste on current collector; winding and drying; cutting to obtain cathode pole piece; preparing composite cathode for solid battery; pressing cathode pole piece; blanking; and oven storing to obtain composite cathode for solid battery. DESCRIPTION OF DRAWING(S) - The drawing shows a charging and discharging circulating graph of solid-state battery prepared using composite negative electrode (Drawing includes non-English language text).