| abstract |
The present invention relates to a lithium-sulfur secondary battery comprising a positive electrode, a negative electrode, a separator and an electrolyte, wherein the electrolyte comprises a lithium salt and a solvent, the solvent comprising a nitrile-based solvent, a fluorinated ether-based solvent and a disulfide-based solvent in a specific ratio by volume, and thus, for the positive electrode which satisfies the specific conditions of high loading and low porosity, the first cycle discharge capacity and average discharge voltage of the lithium-sulfur secondary battery comprising the electrolyte may be improved. |