CATHODE ACTIVE MATERIAL FOR LITHIUM-SULFUR BATTERY, PREPARATION METHOD THEREFOR, AND LITHIUM-SULFUR BATTERY COMPRISING SAME

The present invention relates to a positive electrode active material for a lithium-sulfur battery, a preparation method thereof, and a lithium-sulfur battery comprising the same, more particularly to a positive electrode active material for a lithium-sulfur battery comprising a particulate structure of a core-shell structure which comprises a core part and a shell part covering the whole surface or a part of the surface of the core part, wherein the core part comprises a sulfur compound, and the shell part comprises a polythiophene acetic acid-polyethylene glycol graft copolymer.The positive electrode active material for lithium-sulfur battery of the present invention has excellent electrochemical reactivity and adsorbs lithium polysulfide to improve capacity and lifetime characteristics of the lithium-sulfur battery.