US 12,272,822 B2
Method for manufacturing positive electrode active material, and secondary battery
Masahiro Takahashi, Kanagawa (JP); Mayumi Mikami, Kanagawa (JP); Yohei Momma, Kanagawa (JP); Teruaki Ochiai, Kanagawa (JP); and Jyo Saitou, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
Appl. No. 16/624,319
Filed by SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi (JP)
PCT Filed Jun. 14, 2018, PCT No. PCT/IB2018/054351
§ 371(c)(1), (2) Date Dec. 19, 2019,
PCT Pub. No. WO2019/003025, PCT Pub. Date Jan. 3, 2019.
Claims priority of application No. 2017-124100 (JP), filed on Jun. 26, 2017; application No. 2017-199061 (JP), filed on Oct. 13, 2017; application No. 2018-007052 (JP), filed on Jan. 19, 2018; and application No. 2018-072924 (JP), filed on Apr. 5, 2018.
Prior Publication US 2020/0176770 A1, Jun. 4, 2020
Int. Cl. H01M 4/525 (2010.01); C01G 51/66 (2025.01); C01G 53/66 (2025.01); H01M 4/13915 (2010.01); H01M 10/0525 (2010.01); C01G 45/1214 (2025.01); C01G 51/42 (2025.01); C01G 53/44 (2025.01); H01M 4/02 (2006.01); H01M 4/1315 (2010.01)
CPC H01M 4/525 (2013.01) [C01G 51/66 (2013.01); C01G 53/66 (2013.01); H01M 4/13915 (2013.01); H01M 10/0525 (2013.01); C01G 45/1214 (2013.01); C01G 51/42 (2013.01); C01G 53/44 (2013.01); C01P 2002/32 (2013.01); C01P 2002/52 (2013.01); C01P 2002/72 (2013.01); C01P 2002/77 (2013.01); C01P 2002/85 (2013.01); C01P 2002/88 (2013.01); C01P 2004/04 (2013.01); C01P 2006/40 (2013.01); C01P 2006/42 (2013.01); H01M 2004/028 (2013.01); H01M 4/1315 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for manufacturing a positive electrode active material for a lithium-ion battery, the method comprising steps of:
forming a first mixture by mixing lithium fluoride (LiF) and magnesium fluoride (MgF2);
pulverizing the first mixture to reduce a particle size of the first mixture, thereby yielding a pulverized first mixture;
forming a second mixture by mixing a composite oxide containing lithium, a transition metal, and oxygen with the pulverized first mixture; and
heating the second mixture at higher than or equal to 600° C. and lower than or equal to 950° C. and for longer than or equal to 3 hours,
wherein a molar ratio of the lithium fluoride (LiF) and the magnesium fluoride (MgF2) in the first mixture is LiF:MgF2=x:1 (0.1≤x≤0.5),
wherein in the composite oxide, concentrations of elements other than the lithium, the transition metal, and the oxygen are less than or equal to 5,000 ppm wt when analysis is performed by a glow discharge mass spectroscopy, and
wherein an atomic ratio of the transition metal (TM) in the composite oxide included in the second mixture to magnesium (MgMix1) included in the first mixture is TM:MgMix1=1:y (0.0005≤y≤0.03).