Lithium Secondary Battery

Abstract: The present invention pertains to a lithium secondary battery comprising: a positive electrode containing lithium nickel cobalt manganese-based oxide as a positive electrode active material; a negative electrode containing a negative electrode active material made of Si; and a non-aqueous electrolyte containing lithium salt, an organic solvent, and additives, wherein the organic solvent includes a compound of formula 1 and fluoroethylene carbonate, and the compound of formula 1 constitutes more than 15 wt% of the total non-aqueous electrolyte. [Formula 1] In formula 1, A is a C2 or C3 cyclic phosphite, R is a C1-5 alkylene group, and X is a C1-5 perfluoroalkyl group.

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