CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY HAVING THE SAME

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Cathode active material for a lithium secondary battery and a lithium secondary battery with the same are disclosed. The cathode active material comprises a lithium metal complex oxide described by the following Formula 1 : [Formula 1] Li[LizA]O2 A={M11-x-y(M10.78Mn0.22)x}M2y (wherein, M1 and M2 are at least one distinct transition metal element, a rare earth element, and the combination thereof, -0.05≤z≤0.1, 0.8≤x+y≤1.8, 0.05≤y≤0.35, and the oxidation state of Ni is an oxidation number between 2.01 to 2.4).