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

Abstract: The present invention relates to a positive electrode active material which comprises a large particle size lithium nickel-based transition metal oxide, and a small particle size lithium nickel-based transition metal oxide, wherein the large particle size lithium nickel-based transition metal oxide is in the form of a secondary particle which is an aggregate of primary particles, the small particle size lithium nickel-based transition metal oxide is in the form of at least one of a single particle consisting of one nodule and a quasi-single particle which is a composite of 30 or less nodules, the large particle size lithium nickel-based transition metal oxide has a D50 of 5 ? to 30 ?, a Z value defined by factors of the sphericity distribution characteristics of 1.0 to 9.0, and a negative skewness factor (NSF) of 0.1 to 0.9. The present invention provides a lithium secondary battery in which, by applying the positive electrode active material to a positive electrode, cracking of positive electrode active material particles are suppressed to improve lifespan and output characteristics, and gas generation is reduced.

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