LITHIUM SECONDARY BATTERY HAVING LONG LIFESPAN

The present disclosure relates to a lithium-sulfur battery, comprising an electrode assembly, an electrolyte solution, and a case accommodating the electrode assembly, wherein the electrode assembly comprises a positive electrode comprising a sulfur-carbon composite, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; wherein the negative electrode comprises a lithium-containing layer; and a solid electrolyte interphase (SEI) layer on at least one surface of the lithium-containing layer, wherein the electrolyte solution contains 1 weight% or more of a nitrogen compound based on the total weight of the electrolyte solution, and / or wherein the negative electrode comprises sulfur (S) in an amount of 3 weight% or less based on a total weight of the negative electrode at a state of charge (SOC) 100. [0002] Furthermore, the present disclosure relates to a method for evaluating a lifespan of a lithium-sulfur battery.