	US 12,463,213 B2
	Positive electrode active material for lithium-ion secondary cell, and lithium-ion secondary cell
Mikito Suto, Tokyo (JP); Hiroyuki Masuoka, Tokyo (JP); Akira Matsuzaki, Tokyo (JP); and Rintaro Nagano, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP); and JFE MINERAL COMPANY, LTD., Tokyo (JP)
Appl. No. 17/430,253
Filed by JFE STEEL CORPORATION, Tokyo (JP); and JFE MINERAL COMPANY, LTD., Tokyo (JP)
PCT Filed Jan. 31, 2020, PCT No. PCT/JP2020/003683 § 371(c)(1), (2) Date Aug. 11, 2021, PCT Pub. No. WO2020/170763, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 2019-027419 (JP), filed on Feb. 19, 2019.
Prior Publication US 2022/0140336 A1, May 5, 2022
Int. Cl. H01M 4/525 (2010.01); H01M 4/36 (2006.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 10/0562 (2010.01); H01M 50/431 (2021.01); H01M 4/02 (2006.01)

CPC H01M 4/525 (2013.01) [H01M 4/366 (2013.01); H01M 4/62 (2013.01); H01M 4/628 (2013.01); H01M 10/0525 (2013.01); H01M 10/0562 (2013.01); H01M 50/431 (2021.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0068 (2013.01)]

3 Claims

1. A positive electrode active material for a lithium ion secondary battery comprising:

powdery particles including a composite oxide represented by Formula (1) below; and

an organosilicon compound adhered to surfaces of the powdery particles,

wherein the organosilicon compound is at least one selected from the group consisting of n-propyltriethoxysilane, octyltriethoxysilane, and phenyltriethoxysilane,

Li_aNi_bX_cBa_dY_eO_x (1)

where X is at least one element selected from the group consisting of Co and Mn,

Y is at least one element selected from the group consisting of Na, K, Si, B, P and Al,

a, b, c, d and e are each a real number and satisfy relationships below, and

x is a real number and is not limited to a particular numerical value,

a/(b+c): 0.9 to 1.1,

b/(b+c): 0.5 to 0.95,

c/(b+c): 0.05 to 0.5,

d/(b+c): 0.0001 to 0.01,

e/(b+c): more than 0 and not more than 0.1, and

b+c=1.