| abstract |
Provided is a cathode active material represented by chemical formula 1 below.n[Formula 1]nLi x (M 1-m-z A m D z )O 2-t X t nIn chemical formula 1, 0.8≤x≤1.2, 0≤m≤0.01, 0≤z≤0.04, 0≤t≤0.2, M is selected from the group consisting of Ni, Co, Mn, Al, Ti, Fe and a combination thereof, A is selected from the group consisting of Mg, Ca, Sr, Ba and a combination thereof, D is selected from the group consisting of Ti, Zr, Ce, Ge, Sn and a combination thereof, X is selected from the group consisting of S, P, F and a combination thereof, the average oxidation number of A and D is E, and E is E < 2.5. |