A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution consisting of: a lithium salt; an organic solvent; a compound represented by the following Formula 1 as a first additive; and lithium difluorophosphate as a second additive; and optionally at least one selected from a cyclic carbonate-based compound, a halogensubstituted carbonate-based compound, a sultone-based compound, a sulfate-based compound, a phosphate-based compound, a borate-based compound, a nitrile-based compound, a benzene-based compound, an amine-based compound, a silane-based compound, and a lithium salt-based compound as a third additive, wherein a weight ratio of the first additive to the second additive is in a range of 1:2 to 1:10: wherein, in Formula 1, R is a substituted or unsubstituted alkylene group having 1 to 3 carbon atoms, and R 1 to R 3 are each independently hydrogen; and wherein the lithium salt includes Li + as a cation, and includes at least one selected from the group consisting of F -, Cl -, Br -, I -, NO 3 -, N 2 -, BF 4 -, ClO 4 -, AlO 4 -, AlCl 4 -, PF 6 -, SbF 6 -, AsF 6 -, B 10 Cl 10 -, BF 2 C 2 O 4 -, BC 4 O 8 -, PF 4 C 2 O 4 -, PF 2 C 4 O 8 -, (CF 3) 2 PF 4 -, (CF 3) 3 PF 3 -, (CF 3) 4 PF 2 -, (CF 3) 5 PF -, (CF 3) 6 P -, CF 3 SO 3 -, C 4 F 9 SO 3 -, CF 3 CF 2 SO 3 -, (CF 3 SO 2) 2 N -, (FSO 2) 2 N -, CF 3 CF 2 (CF 3) 2 CO -, (CF 3 SO 2) 2 CH -, CH 3 SO 3 -, CF 3 (CF 2) 7 SO 3 -, CF 3 CO 2 -, CH 3 CO 2 -, SCN -, and (CF 3 CF 2 SO 2) 2 N - as an anion, and wherein the nitrile-based compound when present is at least one compound selected from succinonitrile, adiponitrile, acetonitrile, propionitrile, butyronitrile, valeronitrile, caprylonitrile, heptanenitrile, cyclopentanecarbonitrile, cyclohexanecarbonitrile, 2-fluorobenzonitrile, 4-fluorobenzonitrile, difluorobenzonitrile, trifluorobenzonitrile, phenylacetonitrile, 2-fluorophenylacetonitrile, and 4-fluorophenylacetonitrile; and wherein the lithium salt-based compound when present is a compound different from the lithium salt and is at least one compound selected from the group consisting of LiPO 2 F 2, LiODFB, LiB(C 2 O 4) 2, and LiBF 4. a lithium salt; an organic solvent; a compound represented by the following Formula 1 as a first additive; and lithium difluorophosphate as a second additive; and optionally at least one selected from a cyclic carbonate-based compound, a halogensubstituted carbonate-based compound, a sultone-based compound, a sulfate-based compound, a phosphate-based compound, a borate-based compound, a nitrile-based compound, a benzene-based compound, an amine-based compound, a silane-based compound, and a lithium salt-based compound as a third additive, wherein a weight ratio of the first additive to the second additive is in a range of 1:2 to 1:10: wherein, in Formula 1, R is a substituted or unsubstituted alkylene group having 1 to 3 carbon atoms, and R 1 to R 3 are each independently hydrogen; and wherein the lithium salt includes Li + as a cation, and includes at least one selected from the group consisting of F -, Cl -, Br -, I -, NO 3 -, N 2 -, BF 4 -, ClO 4 -, AlO 4 -, AlCl 4 -, PF 6 -, SbF 6 -, AsF 6 -, B 10 Cl 10 -, BF 2 C 2 O 4 -, BC 4 O 8 -, PF 4 C 2 O 4 -, PF 2 C 4 O 8 -, (CF 3) 2 PF 4 -, (CF 3) 3 PF 3 -, (CF 3) 4 PF 2 -, (CF 3) 5 PF -, (CF 3) 6 P -, CF 3 SO 3 -, C 4 F 9 SO 3 -, CF 3 CF 2 SO 3 -, (CF 3 SO 2) 2 N -, (FSO 2) 2 N -, CF 3 CF 2 (CF 3) 2 CO -, (CF 3 SO 2) 2 CH -, CH 3 SO 3 -, CF 3 (CF 2) 7 SO 3 -, CF 3 CO 2 -, CH 3 CO 2 -, SCN -, and (CF 3 CF 2 SO 2) 2 N - as an anion, and wherein the nitrile-based compound when present is at least one compound selected from succinonitrile, adiponitrile, acetonitrile, propionitrile, butyronitrile, valeronitrile, caprylonitrile, heptanenitrile, cyclopentanecarbonitrile, cyclohexanecarbonitrile, 2-fluorobenzonitrile, 4-fluorobenzonitrile, difluorobenzonitrile, trifluorobenzonitrile, phenylacetonitrile, 2-fluorophenylacetonitrile, and 4-fluorophenylacetonitrile; and wherein the lithium salt-based compound when present is a compound different from the lithium salt and is at least one compound selected from the group consisting of LiPO 2 F 2, LiODFB, LiB(C 2 O 4) 2, and LiBF 4.