US 12,170,368 B2
Method of manufacturing positive electrode active material for lithium ion secondary battery
Shuhei Oda, Ehime (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP); and Panasonic Energy Co., Ltd., Osaka (JP)
Appl. No. 17/310,690
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Feb. 18, 2020, PCT No. PCT/JP2020/006368
§ 371(c)(1), (2) Date Aug. 18, 2021,
PCT Pub. No. WO2020/171093, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 2019-029871 (JP), filed on Feb. 21, 2019.
Prior Publication US 2022/0123295 A1, Apr. 21, 2022
Int. Cl. H01M 4/525 (2010.01); C01G 41/00 (2006.01); H01M 4/04 (2006.01); H01M 4/1391 (2010.01); H01M 4/36 (2006.01); H01M 4/88 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [C01G 41/00 (2013.01); H01M 4/0471 (2013.01); H01M 4/1391 (2013.01); H01M 4/366 (2013.01); H01M 4/8882 (2013.01); H01M 2004/028 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of manufacturing a positive electrode active material for a lithium ion secondary battery comprising:
a water-washing step of washing a lithium-nickel composite oxide containing 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) with water, and conducting a filtration to form a washed cake;
a mixing step of mixing, while heating, the washed cake and a tungsten compound without lithium to obtain a tungsten mixture; and
a heat treatment step of heat-treating the tungsten mixture,
wherein a water content of the washed cake is 3.0% by mass or more and 10.0% by mass or less,
a ratio of a number of tungsten atoms contained in the tungsten mixture 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,
a temperature of the mixing step is 30° C. or higher and 70° C. or lower, and
a mixing time of the mixing step is 10 minutes or more and 30 minutes or less.