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

Abstract: A cathode active material according to the present invention comprises: lithium nickel-based transition metal oxide particles in which the molar ratio of Ni of all transition metals is 80 mol% or more; and a coating layer formed on the surfaces of the lithium nickel-based transition metal oxide particles, wherein the lithium nickel-based transition metal oxide particles are in a single-particle form consisting of one single nodule, or a quasi-single-particle form of a composite of 30 or less nodules, the coating layer includes cobalt and aluminum, and the aluminum may be included in an amount of 0.1 mol% to 0.5 mol% with respect to 100 moles of the lithium nickel-based transition metal oxide.

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