NON-AQUEOUS ELECTROLYTE FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY INCLUDING THE SAME

The present invention relates to a non-aqueous electrolyte for a lithium secondary battery, and to a lithium secondary battery comprising the non-aqueous electrolyte, the non-aqueous electrolyte comprising: an organic solvent; a lithium salt; a first additive which is a compound represented by formula 1; a second additive which is lithium tetrafluoroborate; and a third additive including a saturated nitrile-based compound and an unsaturated nitrile-based compound, wherein the lithium salt is different from the second additive.