Lithium secondary battery

Abstract

A lithium secondary battery comprising a positive electrode, a negative electrode, a separator inserted between the positive electrode and the negative electrode and a non-aqueous electrolyte is provided. The positive electrode comprises a first positive electrode active material represented by following Chemical Formula 1. And the non-aqueous electrolyte comprises a first lithium salt, a second lithium salt represented by following Chemical Formula 2 and a non-aqueous organic solvent. LixMyOz  [Chemical Formula 1] Li+RCOO−  [Chemical Formula 2] (In Chemical Formulae 1 and 2, M=NiaMnbCoc, in which 0<a<2, 0<b<2, 0<c<2, a+b+c=1 or 2, 0.5≦x≦1.3, 1<x+y≦3.3, 2≦z≦4, and R is independently a C1-C10 alkyl group, a C6-C12 aryl group, a C2-C5 alkenyl group, a halogen substituted C1-C10 alkyl group, a halogen substituted C6-C12 aryl group or a halogen substituted C2-C5 alkenyl group).

Dependencies are inferred from the claim text.