A lithium secondary battery comprising: a positive electrode including a positive electrode material mixture layer formed on a positive electrode collector; a negative electrode including a negative electrode material mixture layer formed on a negative electrode collector; 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 as a first additive, wherein the positive electrode material mixture layer has a loading capacity of 3.7 mAh/cm 2 to 10 mAh/cm 2 , a concentration of lithium salt in the non-aqueous solution is 1.5 M to 3 M, wherein the organic solvent is a mixed solvent including a cyclic carbonate-based organic solvent and a linear carbonate-based organic solvent, and wherein 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: wherein, in Formula 1, R 1 is an alkylene group having 1 to 5 carbon atoms which is unsubstituted or substituted with fluorine, or -R 1 '-O-, wherein R 1 ' is an alkylene group having 1 to 5 carbon atoms which is unsubstituted or substituted with fluorine, R 2 is an alkylene group having 1 to 3 carbon atoms which is unsubstituted or substituted with fluorine, or -R 2 '-O-, wherein R 2 ' is an alkylene group having 1 to 3 carbon atoms which is unsubstituted or substituted with fluorine, R 3 is an alkylene group having 1 to 5 carbon atoms which is unsubstituted or substituted with fluorine, R 4 is an aliphatic hydrocarbon group or an aromatic hydrocarbon group, R a and R b are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms, o, p, q, and r are the numbers of repeating units, o is an integer of 1 to 5, p is an integer of 1 to 10, r is an integer of 1 to 5, q is an integer of 1 to 15, and b and c are each independently an integer of 1 to 3. a positive electrode including a positive electrode material mixture layer formed on a positive electrode collector; a negative electrode including a negative electrode material mixture layer formed on a negative electrode collector; 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 as a first additive, wherein the positive electrode material mixture layer has a loading capacity of 3.7 mAh/cm 2 to 10 mAh/cm 2 , a concentration of lithium salt in the non-aqueous solution is 1.5 M to 3 M, wherein the organic solvent is a mixed solvent including a cyclic carbonate-based organic solvent and a linear carbonate-based organic solvent, and wherein 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: wherein, in Formula 1, R 1 is an alkylene group having 1 to 5 carbon atoms which is unsubstituted or substituted with fluorine, or -R 1 '-O-, wherein R 1 ' is an alkylene group having 1 to 5 carbon atoms which is unsubstituted or substituted with fluorine, R 2 is an alkylene group having 1 to 3 carbon atoms which is unsubstituted or substituted with fluorine, or -R 2 '-O-, wherein R 2 ' is an alkylene group having 1 to 3 carbon atoms which is unsubstituted or substituted with fluorine, R 3 is an alkylene group having 1 to 5 carbon atoms which is unsubstituted or substituted with fluorine, R 4 is an aliphatic hydrocarbon group or an aromatic hydrocarbon group, R a and R b are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms, o, p, q, and r are the numbers of repeating units, o is an integer of 1 to 5, p is an integer of 1 to 10, r is an integer of 1 to 5, q is an integer of 1 to 15, and b and c are each independently an integer of 1 to 3. <EOS>