US 12,170,363 B2
Positive active material and lithium-ion battery
Qiao Zeng, Fujian (CN); and Kefei Wang, Fujian (CN)
Assigned to NINGDE AMPEREX TECHNOLOGY LIMITED, Ningde (CN)
Filed by Ningde Amperex Technology Limited, Fujian (CN)
Filed on Jun. 23, 2022, as Appl. No. 17/847,801.
Application 17/847,801 is a continuation of application No. 16/249,888, filed on Jan. 16, 2019, abandoned.
Application 16/249,888 is a continuation of application No. PCT/CN2018/122758, filed on Dec. 21, 2018.
Claims priority of application No. 201810123144.4 (CN), filed on Feb. 7, 2018; and application No. 201810779137.X (CN), filed on Jul. 16, 2018.
Prior Publication US 2022/0336793 A1, Oct. 20, 2022
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/364 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A positive active material, comprising: a first particle and a second particle, the first particle has a chemical formula of LieCogM1-gO2-i, and the second particle has a chemical formula of LifCohN1-hO2-j, the element M includes at least two selected from the group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr; the element N includes at least one selected from the group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr; and 0.8≤e≤1.2, 0<g<1, −0.1≤i≤0.2, 0.8≤f≤1.2, 0<h<1, −0.1≤j≤0.2, the number of types of the element M in the first particle is greater than the number of types of the element N in the second particles, wherein a particle diameter of the positive active material meets the following formula (3):
(Dv90-Dv50)−(Dv50-Dv10)≤2.5  equation (3)
Dv90 refers to a particle diameter reaching a volume accumulation of 90% from the small particle diameter side in the volume-based particle size distribution, Dv50 refers to a particle diameter reaching a volume accumulation of 50% from the small particle diameter side in the volume-based particle size distribution, Dv10 refers to a particle diameter reaching a volume accumulation of 10% from the small particle diameter side in the volume-based particle size distribution;
wherein Dv90 is within the range of 20.2 μm to 32.9 μm.