	US 11,855,277 B2
	Composite positive-electrode material and preparation method thereof, positive-electrode plate, secondary battery, and battery module, battery pack, and apparatus containing such secondary battery
Bangrun Wang, Ningde (CN); Na Liu, Ningde (CN); Chengdu Liang, Ningde (CN); Yongchao Liu, Ningde (CN); Xin Sun, Ningde (CN); and Haotian Xie, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed on Oct. 21, 2022, as Appl. No. 17/971,500.
Application 17/971,500 is a continuation of application No. PCT/CN2020/131578, filed on Nov. 25, 2020.
Prior Publication US 2023/0261178 A1, Aug. 17, 2023
Int. Cl. H01M 4/36 (2006.01); H01M 4/04 (2006.01); H01M 4/485 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/58 (2010.01); H01M 4/02 (2006.01)

CPC H01M 4/366 (2013.01) [H01M 4/0404 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/5825 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)]

11 Claims

1. A composite positive-electrode material, comprising a core and a coating layer covering at least part of a surface of the core, wherein:

the core comprises a positive-electrode pre-lithiation material, the positive-electrode pre-lithiation material comprises a lithium-rich metal oxide, and the coating layer comprises a positive-electrode active material;

a charging cut-off voltage of the positive-electrode active material is 3.5V-4.2V (vs. Li/Li⁺), and the lithium-rich metal oxide is selected from one or more of Li₅FeO₄, Li₂CuO₂, Li₂Cu_x1Ni_1-x1-y1M_y1O₂, and Li₂MnO₂, wherein 0<x1 <1, 0≤y1<0.1, M is selected from one or more of Zn, Sn, Mg, Fe, and Mn; and

the positive-electrode active material is selected from one or more of LiFePO₄, Li₃V₂(PO₄)₃and LiFe_yMn_1-yPO₄, wherein 0<y<1.