US 11,894,555 B2
Positive electrode active material for lithium ion secondary battery, method of manufacturing positive electrode active material for lithium ion secondary battery, and lithium ion secondary battery
Takuma Nakamura, Ehime (JP); Haruki Kaneda, Ehime (JP); and Yuki Koshika, Ehime (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Appl. No. 17/264,941
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Jul. 31, 2019, PCT No. PCT/JP2019/030036
§ 371(c)(1), (2) Date Feb. 1, 2021,
PCT Pub. No. WO2020/027204, PCT Pub. Date Feb. 6, 2020.
Claims priority of application No. 2018-147170 (JP), filed on Aug. 3, 2018; and application No. 2018-234866 (JP), filed on Dec. 14, 2018.
Prior Publication US 2021/0313570 A1, Oct. 7, 2021
Int. Cl. H01M 4/505 (2010.01); H01M 4/04 (2006.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
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
OG exemplary drawing
 
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.