Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution consisting of:

• an ionizable lithium salt;
• an organic solvent;
• a mixed additive that is vinylene carbonate, 1,3-propylene sulfate, and 1,3-propane sultone;
• and
• optionally an additional additive,
• wherein the ionizable lithium salt is selected from the group consisting of LiCl, LiBr, LiI, LiClO4, LiB10Cl10, LiPF6, LiCF3SO3, LiCH3CO2, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, LiAlO4, and LiCH3SO3, LiN(SO2C2F5)2, LiN(SO2CF3)2, or mixtures thereof,
• wherein the organic solvent comprises at least one cyclic carbonate-based organic solvent and at least one linear carbonate-based organic solvent,
• wherein the at least one cyclic carbonate-based organic solvent is selected from the group consisting of ethylene carbonate, 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, and fluoroethylene carbonate (FEC),
• wherein the at least one linear carbonate-based organic solvent selected from the group consisting of dimethyl carbonate, diethyl carbonate, dipropyl carbonate, ethylmethyl carbonate, methylpropyl carbonate, and ethylpropyl carbonate,
• wherein the additional additive is at least one selected from the group consisting of fluorobenzene (FB), tert-butylbenzene (TBB), tert-pentylbenzene (TPB), and LiBF4,
• wherein the vinylene carbonate, the 1,3-propylene sulfate, and 1,3-propane sultone are present in the mixed additive in a weight ratio of 1:1:1 to 1:0.5:0.2, and
• wherein the mixed additive is included in an amount of 1 wt % to 4.5 wt % based on a total weight of the non-aqueous electrolyte solution for a lithium secondary battery.