LITHIUM-SULFUR SECONDARY BATTERY

A lithium-sulfur secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution are provided. The positive electrode has an SC factor value of 0.45 or more. The electrolyte solution includes a solvent and a lithium salt, and the solvent includes a first solvent having a DVfactor value of 1.7 or less, and a second solvent which is a fluorinated ether-based solvent.