US 11,967,706 B2
Composite metal oxide material and preparation method thereof, positive electrode plate, secondary battery, battery module, battery pack and electrical device
Bangrun Wang, Ningde (CN); Zhenguo Zhang, Ningde (CN); Chongheng Shen, Ningde (CN); and Na Liu, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed on Sep. 18, 2022, as Appl. No. 17/933,120.
Application 17/933,120 is a continuation of application No. PCT/CN2021/111682, filed on Aug. 10, 2021.
Prior Publication US 2023/0057959 A1, Feb. 23, 2023
Int. Cl. H01M 4/36 (2006.01); C01G 49/00 (2006.01); C01G 51/00 (2006.01); C01G 53/00 (2006.01); H01M 4/04 (2006.01); H01M 4/48 (2010.01); H01M 4/485 (2010.01); H01M 4/50 (2010.01); H01M 4/505 (2010.01); H01M 4/52 (2010.01); H01M 4/525 (2010.01); H01M 10/05 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [C01G 49/0027 (2013.01); C01G 49/0045 (2013.01); C01G 49/0072 (2013.01); C01G 51/42 (2013.01); C01G 53/42 (2013.01); H01M 4/0471 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2002/50 (2013.01); C01P 2004/03 (2013.01); C01P 2004/61 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A composite metal oxide material used for a positive electrode of a secondary battery, wherein the composite metal oxide material is in a form of a particle and comprises:
a central core, wherein the central core comprises a material having a chemical formula of Li5FexM1−xO4, wherein 0.6≤x<1; and
a coating layer on a surface of the central core, wherein the coating layer comprises a material having a chemical formula of LiMO2; and,
wherein M is one or more metal elements different from Fe and with +3 valence, and an absolute value of the difference between +3-valence ion radius of Fe and +3-valence ion radius of M is ≤0.02 nm.