Cathode Active Material And Cathode And Lithium Secondary Battery Comprising Same

Abstract: The present invention relates to a cathode active material comprising a lithium nickel based transition metal oxide of a large diameter and a lithium nickel based transition metal oxide of a small diameter wherein the lithium nickel based transition metal oxide of a large diameter is in the form of secondary particles that are aggregates of primary particles the lithium nickel based transition metal oxide of a small diameter is in the form of at least one of a single particle consisting of one nodule and a similar single particle as a composite of 30 or less nodules the lithium nickel based transition metal oxide of a large diameter has D50 of 5 30 ??? and a Y value defined by factors of the particle size distribution characteristics is 2.2 or less. The present invention provides a lithium secondary battery in which by applying the cathode active material to a cathode cracking of cathode active material particles may be suppressed so that the lithium secondary battery has improved lifespan and output characteristics and a reduced amount of gas generation.

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