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

Abstract: The present invention relates to a positive electrode active material comprising a lithium nickel-based transition metal oxide in the form of secondary particles which are aggregates of primary particles, wherein, with respect to the cross-section at the point of 40% to 60% of the diameter of the secondary particles, the following are satisfied: a) the ratio of the number of primary particles having an aspect ratio of 1.6 or greater in the cross-section is 0.81 or greater; and b) a K value calculated by formula 1 below is 12 to 40. The positive electrode active material as characterized above may reduce particle cracking between cycles and thus may inhibit battery degradation and enhance stability. [Formula 1] K = RAP x NP / AS. Here, RAP is the average aspect ratio of the primary particles, NP is the number of primary particles, and AS is the cross-sectional area of the secondary particles.

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