| abstract |
The present invention relates to a positive electrode active material for a lithium secondary battery and a lithium secondary battery comprising the same, wherein the positive electrode active material is a retardable intercalation / de-intercalation of lithium and a metal compound layer formed on a surface thereof. It includes an additive compound represented by the formula (1).n n n [Formula 1]n n n Li x Ni y M 1-y O 2 n n n (Wherein, 2.01 ≦ x ≦ 2.1, 0.95 ≦ y ≦ 1,n n n M is selected from the group consisting of Al, Co, Ni, Mn, Fe and mixtures thereof)n n n As the positive electrode active material of the present invention includes an additive compound having a metal compound layer formed on the surface thereof, the charge capacity may be increased, the irreversible capacity of the battery may be reduced, and the safety may be increased.n n n n Cathode active material, metal oxide layer, irreversible capacity, explosion |