CPC H01M 4/505 (2013.01) [H01M 4/0471 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] | 10 Claims |
1. A positive electrode active material for a lithium ion secondary battery containing lithium nickel manganese complex oxide particles,
wherein the lithium nickel manganese complex oxide particles are composed of secondary particles formed of aggregated primary particles of a lithium nickel manganese complex oxide represented by a general formula LidNi1−a−b−cMnaMbZrcO2+α (where M is at least one element selected from Co, W, Mo, Mg, Ca, Al, Ti, Cr, and Ta, and is 0.05≤a<0.60, 0≤b<0.60, 0.00003≤c≤0.03, 0.05≤a+b+c≤0.60, 0.95≤d≤1.20, and −0.2≤α≤0.2),
wherein at least a portion of zirconium is dispersed in the primary particle, and
wherein the positive electrode active material for the lithium ion secondary battery contains an amount of excessive lithium obtained by a neutralization titration method is 0.02 mass % or more and 0.09 mass % or less.
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