POSITIVE ELECTRODE ACTIVE MATERIAL POWDER FOR LITHIUM SECONDARY BATTERY, METHOD FOR MANUFACTURING THE SAME, AND LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a positive electrode active material for a lithium secondary battery comprising a lithium-nickel-manganese-cobalt composite oxide capable of enhancing the capacity per unit volume and the capacity retention ratio of a lithium secondary battery, to provide a method for manufacturing the same, and to provide a lithium secondary battery excellent in battery performance such as a capacity per unit volume and capacity retention ratio.

SOLUTION: A positive electrode active material powder for a lithium secondary battery is composed of secondary particles formed by the aggregation of primary particles composed of a lithium-nickel-manganese-cobalt composite oxide represented by the formula (1): LixNi1-y-zMnyCozO2. The secondary particles constituting the positive electrode active material powder for a lithium secondary battery have an average particle size of 4 to 30 μm, and the pressure density of the positive electrode active material powder for a lithium secondary battery when compressed at 3 ton/cm2is 3.55 g/cm3or higher.

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