US 12,334,536 B2
Positive electrode material, electrochemical device containing same, and electronic device
Wenyuan Liu, Ningde (CN); Gang Peng, Ningde (CN); and Ye Lang, Ningde (CN)
Filed by Ningde Amperex Technology Limited, Fujian (CN); and Dongguan Amperex Technology Limited, Guangdong (CN)
Filed on Apr. 8, 2024, as Appl. No. 18/629,202.
Application 18/629,202 is a continuation of application No. 17/187,629, filed on Feb. 26, 2021, granted, now 11,984,579.
Application 17/187,629 is a continuation of application No. PCT/CN2020/077940, filed on Mar. 5, 2020.
Prior Publication US 2024/0258496 A1, Aug. 1, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/04 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/0471 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A positive electrode material, comprising:
secondary particles, wherein the secondary particles comprise primary particles; and
the positive electrode material satisfies the following relational expression:

OG Complex Work Unit Math
wherein, Dv50a represents Dv50 directly measured by a laser particle size analyzer for the positive electrode material without ultrasonic treatment, Dv50b represents Dv50 measured by the laser particle size analyzer for the positive electrode material after ultrasonic treatment, and Dv50 represents a particle size of the positive electrode material at a cumulative volume of 50% in a volume-based particle size distribution as measured by starting from small particle sizes;
the secondary particles further comprise a material layer, the material layer is disposed on at least a part of a surface of the secondary particles, and the material layer comprises at least one of elements B, P, Al, Zr, C, or S;
wherein the positive electrode material has at least one of the following characteristics:

OG Complex Work Unit Math
wherein, Dv10a represents Dv10 directly measured by the laser particle size analyzer for the positive electrode material without ultrasonic treatment, Dv10b represents Dv10 measured by the laser particle size analyzer for the positive electrode material after ultrasonic treatment, Dv90a represents Dv90 directly measured by the laser particle size analyzer for the positive electrode material without ultrasonic treatment, Dv90b represents Dv90 measured by the laser particle size analyzer for the positive electrode material after ultrasonic treatment, Dv99a represents Dv99 directly measured by the laser particle size analyzer for the positive electrode material without ultrasonic treatment, Dv99b represents Dv99 measured by the laser particle size analyzer for the positive electrode material after ultrasonic treatment, Dv10 represents a particle size of the positive electrode material at a cumulative volume of 10% in the volume-based particle size distribution as measured by starting from small particle sizes, Dv90 represents a particle size of the positive electrode material at a cumulative volume of 90% in the volume-based particle size distribution as measured by starting from small particle sizes, and Dv99 represents a particle size of the positive electrode material at a cumulative volume of 99% in the volume-based particle size distribution as measured by starting from small particle sizes.