LITHIUM-SULFUR SECONDARY BATTERY COMPRISING GRAPHENE COMPOSITE CATHODE INCLUDING SULFUR AND METHOD FOR MANUFACTURING SAME

摘要

The present invention relates to a lithium-sulfur secondary battery comprising a graphene composite cathode including sulfur and a method for manufacturing the same. The present invention uses a synthesized graphene composite as a cathode active material for a lithium-sulfur secondary battery, wherein pores are formed on the surface of a graphene sheet by processing the graphene sheet with hydrofluoric acid (HF), a graphene composite including sulfur particles is synthesized by growing the sulfer particles in the formed pores. The graphene composite has a structure which allows graphene to encompass the sulfer particles, and can effectively inhibit polysufides elution caused by solution reactions in a battery charge and discharge regulator, thereby minimizing capacity reduction and side effects resulting from the elution. Therefore, properties of a lithium-sulfur secondary battery can be improved.