US 12,087,944 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
Haruki Kaneda, Ehime (JP); Yuki Koshika, Ehime (JP); and Takuma Nakamura, Ehime (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Appl. No. 17/263,621
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Jul. 30, 2019, PCT No. PCT/JP2019/029905
§ 371(c)(1), (2) Date Jan. 27, 2021,
PCT Pub. No. WO2020/027158, PCT Pub. Date Feb. 6, 2020.
Claims priority of application No. 2018-144554 (JP), filed on Jul. 31, 2018.
Prior Publication US 2021/0305567 A1, Sep. 30, 2021
Int. Cl. H01M 4/525 (2010.01); C01G 53/00 (2006.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01); H01M 4/131 (2010.01); H01M 4/1391 (2010.01)
CPC H01M 4/525 (2013.01) [C01G 53/50 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); C01G 53/006 (2013.01); C01P 2002/60 (2013.01); C01P 2002/72 (2013.01); C01P 2002/74 (2013.01); C01P 2002/77 (2013.01); C01P 2002/85 (2013.01); C01P 2004/51 (2013.01); C01P 2004/61 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); H01M 4/131 (2013.01); H01M 4/1391 (2013.01); Y02E 60/10 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method of manufacturing a positive electrode active material for a lithium ion secondary battery comprising:
obtaining nickel-manganese composite hydroxide particles represented by a following general formula:
NiaMnbM-Mgd(OH)2+β  (2)
in which an element M in the general formula (2) is at least one element selected from Co, Ti, W, B, Mo, V, Nb, Ca, Al, Cr, Zr, and Ta, 0.50≤a≤0.95, 0.03≤b≤0.40, 0.02≤c≤0.40, 0.0005≤d≤0.05, a+b+c+d=1.0, and 0≤β≤0.4;
mixing the nickel-manganese composite hydroxide particles and a lithium compound to obtain a raw material mixture; and
firing the raw material mixture in a temperature range of 700° C. to 1000° C. in an oxidizing atmosphere to obtain a lithium-nickel-manganese composite oxide
wherein in the obtaining of the nickel-manganese composite hydroxide particles, a mixed aqueous solution containing at least nickel, manganese, and magnesium, and an alkaline aqueous solution are continuously supplied to a reactor, and a precipitate is collected by overflowing from the reactor.