US 12,227,431 B2
Method of manufacturing positive electrode active material for lithium ion secondary battery, positive electrode active material for lithium ion secondary battery, and lithium ion secondary battery
Jun Suzuki, Ehime (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP); and Panasonic Energy Co., Ltd., Osaka (JP)
Appl. No. 17/432,163
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Feb. 18, 2020, PCT No. PCT/JP2020/006360
§ 371(c)(1), (2) Date Aug. 19, 2021,
PCT Pub. No. WO2020/171088, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 2019-029870 (JP), filed on Feb. 21, 2019.
Prior Publication US 2022/0135429 A1, May 5, 2022
Int. Cl. C01G 53/00 (2006.01); H01M 10/0525 (2010.01)
CPC C01G 53/42 (2013.01) [H01M 10/0525 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of manufacturing a positive electrode active material for a lithium ion secondary battery comprising:
a mixing step of mixing a lithium-nickel composite oxide, which is a starting material, with a tungsten compound powder without lithium, while being heated, to prepare a tungsten mixture;
a heat treatment step of heat-treating the tungsten mixture,
wherein the lithium-nickel composite oxide contains lithium (Li), nickel (Ni), and an element M
wherein, the element M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, Co, and Al,
wherein, in the starting material, a ratio of number of tungsten atom to a total number of nickel and the element M atoms contained in the lithium-nickel composite oxide is 0.05 at. % or more and 3.00 at. % or less,
wherein a water content, which is a proportion of the water in the starting material and the lithium-nickel composite oxide, is 3.0% by mass or more,
wherein a temperature of the mixing step is 30° C. or higher and 65° C. or lower, and
wherein an atmosphere of the mixing step is either a decarboxylated air or an inert gas.