| abstract |
The present invention provides a lithium secondary battery having a cathode, an anode, a separation film interposed between the cathode and the anode, and a non-aqueous electrolyte, the lithium secondary battery being characterized by comprising: a cathode including a first cathode active material represented by formula 1; and a non-aqueous electrolyte including a first lithium salt, a second lithium salt represented by formula 2, and a non-aqueous organic solvent. [Formula 1] LixMyOz [Formula 2] Li+RCOO- (where, M=NiaMnbCoc, wherein 0<a<2, 0<b<2, 0<c<2, and a+b+c=1 or 2; 0.5<=x<=1.3; 1<x+y<=3; 2<=z<=4; and R is independently a C1-C10 alkyl group, a C6-C12 aryl group, a C2-C5 alkenyl group, a C1-C10 alkyl group substituted with halogen, a C6-C12 aryl group substituted with halogen or a C2-C5 alkenyl group substituted with halogen). |