Lithium-sulfur battery having high energy density

Abstract

Disclosed is a lithium-sulfur battery having a high energy density, which is capable of utilizing 80% or more of the theoretical discharging capacity, 1,675 mAh/g, of sulfur by using SSE (sparingly solvating electrolyte) electrolyte system (discharging capacity: ˜1,600 mAh/gs) rather than the existing catholyte electrolyte system (discharging capacity: ˜1,200 mAh/gs) and by not using a nitrile-based solvent, and also is capable of implementing an excellent life performance by using a positive electrode carbon material having high specific surface area. The lithium-sulfur battery comprises an electrolyte including a first solvent containing a fluorine-based ether compound, a second solvent containing a glyme-based compound, and a lithium salt; and a positive electrode including an active material containing sulfur and a carbon material, and the carbon material includes two or more carbon materials having different average pore sizes from each other.

Dependencies are inferred from the claim text.