Positive Electrode Active Material, Method for Preparing the Same, Positive Electrode and Lithium Secondary Battery Comprising the Same

Abstract

A positive electrode active material includes a lithium-rich manganese-based oxide represented by the following Chemical Formula 1, and has a structure in which a rock-salt-type lithium manganese oxide and a layered lithium transition metal oxide are mixed. The lithium-rich manganese-based oxide may have a prescribed internal porosity. in Chemical Formula 1, 1.00<a, 0≤b≤0.53, 0≤c≤0.10, 0.47≤d≤1.00, 0≤e≤0.20, and M is at least one selected from the group consisting of Al, B, Co, W, Mg, V, Ti, Zn, Ga, In, Ru, Nb, Sn, Sr and Zr.

Dependencies are inferred from the claim text.