A lithium secondary battery is disclosed herein. In some embodiment, a lithium secondary battery which includes a positive electrode including a positive electrode material mixture layer, wherein the positive electrode material mixture layer has a loading capacity of 3.7 mAh/cm2 to 10 mAh/cm2, a negative electrode including a negative electrode material mixture layer, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte solution including a lithium salt, an organic solvent, and a compound represented by Formula 1, the concentration of the lithium salt in the non-aqueous electrolyte solution is 1.5 M to 3 M, the organic solvent is a mixed solvent including a cyclic carbonate-based organic solvent and a linear carbonate-based organic solvent, and the compound represented by Formula 1 is included in an amount of 0.1 wt % to 5 wt % based on a total weight of the non-aqueous electrolyte solution.