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

Abstract: The present invention pertains to a positive electrode material for a lithium secondary battery, and a lithium secondary battery comprising the positive electrode material, the positive electrode material comprising a large-diameter positive electrode active material and a small-diameter positive electrode active material, wherein: the large-diameter positive electrode active material and the small-diameter positive electrode active material each independently comprise a lithium nickel-based oxide; Ml/Ms is 0. 6 to 4.0, Ml and Ms respectively representing the cation mixing ratio of the large-diameter positive electrode active material and the cation mixing ratio of the small-diameter positive electrode active material; and Pl/Ps is 0.1 to 2.0, Pl and Ps respectively representing the average particle size of primary particles in the large-diameter positive electrode active material and the average particle size of primary particles in the small-diameter positive electrode active material.

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