Positive Electrode Active Material, Positive Electrode Comprising The Same, And Lithium Secondary Battery

Abstract: The present invention relates to a cathode active material comprising an overlithiated manganese-based transition metal oxide, comprising an overlithiated manganese-based transition metal oxide, and having a density (P) of 42-50 as derived by equation 1, wherein the cathode active material maximizes intermolecular density by means of optimization of a ratio between lattice parameters of a unit cell and a rolling density under weak pressure, and accordingly, may provide a cathode having optimal density after electrode coating and electrode rolling. In equation 1, Vunit-cell is the volume of a unit cell (Å3) which is derived through equation 2, and d400 is the rolling density (g/cm3) when being rolled at 400 kgf. In equation 2, a and c are crystal lattice parameters (Å) derived from XRD measurement of the cathode active material.

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