	US 12,172,906 B2
	Precursor for lithium secondary battery positive electrode active materials, method for producing precursor for lithium secondary battery positive electrode active materials, and method for producing lithium composite metal compound
Keiji Degura, Fukui (JP); Ryota Kobayashi, Fukui (JP); and Yusuke Maeda, Fukui (JP)
Assigned to SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP); and TANAKA CHEMICAL CORPORATION, Fukui (JP)
Appl. No. 17/298,815
Filed by SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP); and TANAKA CHEMICAL CORPORATION, Fukui (JP)
PCT Filed Dec. 6, 2019, PCT No. PCT/JP2019/047941 § 371(c)(1), (2) Date Jun. 1, 2021, PCT Pub. No. WO2020/116649, PCT Pub. Date Jun. 11, 2020.
Claims priority of application No. 2018-230351 (JP), filed on Dec. 7, 2018.
Prior Publication US 2022/0033275 A1, Feb. 3, 2022
Int. Cl. C01G 53/04 (2006.01); C01G 53/00 (2006.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)

CPC C01G 53/04 (2013.01) [C01G 53/006 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2002/72 (2013.01); C01P 2004/61 (2013.01); C01P 2006/12 (2013.01)]

26 Claims

1. A precursor for lithium secondary battery positive electrode active materials, comprising:

nickel,

wherein the following formula (1) is satisfied,

0.20≤Dmin/Dmax (1)

where, in the formula (1), Dmin is a minimum particle diameter (μm) in a cumulative particle size distribution curve obtained by measuring the precursor with a laser diffraction-type particle size distribution measuring instrument, and Dmax is a maximum particle diameter (μm) in the cumulative particle size distribution curve obtained by the measurement with the laser diffraction-type particle size distribution measuring instrument, and

wherein the following formula (5) is satisfied,

0.65≤α/β≤1.45 (5)

where, in the formula (5), α is a half width of a diffraction peak at 2θ=52.4±1° that is obtained by X-ray diffraction using a CuKα ray, and β is a half width of a diffraction peak at 2θ=73.9±1° that is obtained by X-ray diffraction using a CuKα ray.