US 11,728,469 B2
Positive electrode active material for secondary battery, secondary battery, battery management unit, and electronic device
Teppei Oguni, Kanagawa (JP); and Takuya Miwa, Mie (JP)
Assigned to SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Kanagawa-ken (JP)
Filed by SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi (JP)
Filed on May 11, 2021, as Appl. No. 17/316,986.
Application 17/316,986 is a continuation of application No. 15/446,041, filed on Mar. 1, 2017, granted, now 11,088,363.
Claims priority of application No. 2016-040959 (JP), filed on Mar. 3, 2016.
Prior Publication US 2021/0273216 A1, Sep. 2, 2021
Int. Cl. H01M 10/0525 (2010.01); H01M 4/136 (2010.01); C01B 25/45 (2006.01); H01M 4/36 (2006.01); H01M 4/58 (2010.01); H01M 10/42 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/136 (2013.01) [C01B 25/45 (2013.01); H01M 4/366 (2013.01); H01M 4/5825 (2013.01); H01M 10/0525 (2013.01); H01M 10/425 (2013.01); H01M 2004/028 (2013.01); H01M 2010/4278 (2013.01); H01M 2220/20 (2013.01); H01M 2220/30 (2013.01); Y02E 60/10 (2013.01); Y02T 10/70 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for manufacturing a positive electrode active material of a lithium-ion battery, comprising the steps of:
dissolving a lithium compound in a solvent to form a solution containing lithium;
dissolving a phosphorus compound in a solvent to form a solution containing phosphorus;
dissolving an M(II) compound in a solvent to form a solution containing M(II), wherein M(II) is one or more of iron(II), manganese(II), cobalt(II), and nickel(II);
mixing the solution containing lithium and the solution containing phosphorus to form a first mixed solution in an air atmosphere;
adding the solution containing M(II) dropwise to the first mixed solution while stirring the first mixed solution so as to form a second mixed solution in an air atmosphere;
putting the second mixed solution into a container resistant to heat and pressure;
heating the second mixed solution;
cooling the second mixed solution; and
obtaining a solid by filtration of the cooled down second mixed solution.