Positive Electrode Active Material Manufacturing Method Therefor And Positive Electrode And Lithium Secondary Battery Comprising Same

Abstract: The present invention relates to a positive electrode active material and a manufacturing method therefor the positive electrode active material comprising: a lithium composite transition metal oxide which is in the form of a secondary particle in which a plurality of grains are aggregated and includes an oriented structure in which the long axis of the grains is arranged in a direction from the center of the secondary particle to the surface thereof in at least a portion of the secondary particle; and a coating layer formed on the surface of the secondary particle and comprising a Co element wherein the lithium composite transition metal oxide contains nickel and cobalt and satisfies C1 C2 C3 when the ratio of the mole number of cobalt to the mole number of nickel inside the grains is C1 the ratio of the mole number of cobalt to the mole number of nickel at the grain boundary which is the interface between the grains is C2 and the ratio of the mole number of cobalt to the mole number of nickel in the coating layer is C3.

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