abstract |
The present invention relates to a cathode active material for a lithium secondary battery, a method of preparing thereof and a lithium secondary battery comprising the same, wherein the cathode active material comprises a compound of formula (I): n Li z (Ni 1-x-y Co x Mn y )O 2 (I)n wherein, 0.97≦z≦1.1, 0.5≦1-x-y≦0.8, and x:y=1:1.15 to 1:3. |