Cathode Active Material, Preparation Method Therefor, Cathode Comprising Same, And Lithium Secondary Battery

Abstract: The present invention relates to a cathode active material of an overlithiated manganese-based oxide and a preparation method therefor, the cathode active material exhibiting enhanced capacity characteristics and excellent lifespan characteristics and rolling characteristics. The cathode active material is represented by chemical formula 1, and may contain an overlithiated manganese-based oxide having a mixed structure of a rock-salt phase lithium manganese oxide and a layered lithium transition metal oxide and have a predetermined internal porosity. [Chemical formula 1] Lia[NibCocMndMe]O2 , where 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.

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