Positive Electrode Active Material And Positive Electrode Comprising Same

Abstract: The present invention relates to a positive electrode active material which comprises: a nickel-based lithium composite metal oxide in a single-particle or quasi-single-particle form, wherein the content of Ni among transition metals other than lithium is 80 atm% or more; and a coating layer positioned on the surface of the nickel-based lithium composite metal oxide and containing cobalt, and which satisfies expression 1. [Expression 1] 1= XY/Z =3, wherein, in expression 1, X is the number of moles (mol%) of Co in the coating layer with respect to 100 moles of the nickel-based lithium composite metal oxide, Y is an average particle diameter (µm) of nodules of the nickel-based lithium composite metal oxide, Z is D50(µm) of the positive electrode active material, and Z is 5-12 µm.

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