Cathode Active Material, Cathode Comprising Same, And Lithium Secondary Battery

Abstract: The present invention relates to a cathode active material comprising a large-particle-diameter lithium nickel-based transition metal oxide and a small-particle-diameter lithium nickel-based transition metal oxide, wherein the large-particle-diameter lithium nickel-based transition metal oxide is in the form of a secondary particle, which is an aggregate of primary particles, and the small-particle-diameter lithium nickel-based transition metal oxide is in the form of at least one of a single particle composed of one nodule and a pseudo-single particle which is a composite of 30 or fewer nodules, and the P value, defined by a factor relating to the shape of a large-particle diameter particle and a factor relating to the specific surface area of a small-particle diameter particle is 1.00 or larger. The application of the cathode active material to a cathode suppresses the cracking of cathode active material particles, thereby providing a lithium secondary battery which exhibits improved lifespan and output characteristics along with a reduced amount of gas generation.

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