US 12,191,480 B2
Positive electrode active material for secondary battery, and secondary battery
Kosuke Kuroda, Osaka (JP); Hiroshi Kawada, Hyogo (JP); and Atsushi Fukui, Hyogo (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/604,144
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Apr. 24, 2020, PCT No. PCT/JP2020/017613
§ 371(c)(1), (2) Date Oct. 15, 2021,
PCT Pub. No. WO2020/218474, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019-086073 (JP), filed on Apr. 26, 2019.
Prior Publication US 2022/0216460 A1, Jul. 7, 2022
Int. Cl. H01M 4/36 (2006.01); C01G 53/00 (2006.01); H01M 4/02 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/58 (2010.01)
CPC H01M 4/364 (2013.01) [C01G 53/42 (2013.01); C01G 53/50 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/5825 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A positive electrode active material for secondary battery, comprising:
a first composite oxide component represented by general formula Liα[LixMnyCozMe(1−x−y−z)]O2 where Me is at least one selected from Ni, Fe, Ti, Bi, Nb, W, Mo, and Ta, and 0.5<α<0.85, 0.05<x<0.2, 0.4<y<0.75, 0<z<0.25, and 1−x−y−z≥0 hold true, and having at least one crystal structure selected from O2 structure, T2 structure, and O6 structure; and
a second composite oxide component represented by general formula LiaMObAc where M is at least one selected from Ni, Co, Mn, Fe, Cu, Ti, Nb, Al, Ga, Bi, Zr, Ce, Y, W, Ta, Sn, Ca, Ba, and Na; A includes at least one selected from F and Cl; and 1.3<a<7, 2>b<5, and 0<c>0.3 hold true,
wherein the positive electrode active material includes a composite of the first composite oxide component and the second composite oxide component,
the composite contains, within a single composite particle, a region having the first composite oxide component and a region having a second composite oxide composition.