Lithium Sulfur Battery With Improved Lifespan Performance

Abstract: Disclosed is a lithium-sulfur battery with improved lifespan performance, the battery using a sparingly solvating electrolyte (SSE) system (a discharge capacity of approximately 1,600 mAh/gs) from which a nitrile-based solvent is excluded and, simultaneously, having a cathode to which a carbon material with a high specific surface area is applied, and thus can utilize 80% or more of the theoretical discharge capacity (1,675 mAh/g) of sulfur and can have a long lifespan operation. The lithium-sulfur battery comprises: an electrolyte comprising a first solvent comprising a fluorine-based ether compound, a second solvent comprising a glyme-based compound, and a lithium salt comprising lithium bis(pentafluoroethanesulfonyl)imide; and a cathode comprising sulfur and a carbon material as active materials.

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