| abstract |
The present invention provides a lithium-sulfur secondary battery comprising a positive electrode, a negative electrode, a separator and an electrolyte. The electrolyte solution includes a solvent and a lithium salt, and the solvent includes a first solvent having a DV 2 factor of 1.75 or less, a fluorinated ether solvent, and one oxygen atom. And a third solvent which is a cyclic ether solvent. The solvent includes 1% by weight or more and less than 20% by weight of the third solvent based on the total weight of the first solvent and the second solvent. |