LAYERED LITHIUM NICKEL OXIDE, PROCESS FOR PRODUCING THE SAME AND LITHIUM SECONDARY CELL EMPLOYING IT

Provided is a metal oxide for a cathode active material of a lithium secondary battery capable of having improved structural and thermal stability, high efficiency, high capacity, and excellent cycle property and life span property, the metal oxide represented by the following Chemical Formula 1: [Chemical Formula 1]Li a Ni x Co y M z O 2 (in Chemical Formula 1, M is any one selected from aluminum, magnesium, titanium, gallium and indium, and a, x, y and z satisfy 1.01¤a¤1.05, 0.7¤x¤0.9, 0¤y¤0.17, 0.02¤z¤0.16, and x+y+z=1, respectively).