| 摘要 |
The present invention relates to a cathode active material for a lithium secondary battery, a preparation method therefor, and a lithium secondary battery containing the same and, specifically, can provide: a cathode active material for a lithium secondary battery, the material being an orthorhombic layered structure represented by the following chemical formula 1 or a compound represented by the following chemical formula 2; a preparation method therefor; and a lithium secondary battery containing the same. [Chemical formula 1] Li1+xMyO2+z [Chemical formula 2] {m(Li1+xMyO2+z)}⋅{1-m(LiMO2)} In chemical formula 1 or 2, M is at least one or more elements selected from the group consisting of Mn, Co, Ni, Al, Ti, Mo, V, Cr, Fe, Cu, Zr, Nb and Ga, and 0.7≤x≤1.2, 0.8≤y≤1.2, -0.2≤z≤0.2, and 0<m≤1. |
