US 11,916,229 B2
Positive electrode active material and preparation method therefor, positive electrode plate containing same, secondary battery, and power consuming device
Qingyan Ma, Ningde (CN); Yuzhen Zhao, Ningde (CN); Yingjie Guan, Ningde (CN); Yan Wen, Ningde (CN); and Qisen Huang, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed on Jun. 15, 2023, as Appl. No. 18/335,143.
Application 18/335,143 is a continuation of application No. PCT/CN2022/084479, filed on Mar. 31, 2022.
Prior Publication US 2023/0335723 A1, Oct. 19, 2023
Int. Cl. H01M 4/36 (2006.01); H01M 4/58 (2010.01); H01M 4/583 (2010.01); H01M 4/62 (2006.01); H01M 4/04 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/0404 (2013.01); H01M 4/0471 (2013.01); H01M 4/583 (2013.01); H01M 4/5825 (2013.01); H01M 4/622 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A positive electrode active material with a core-shell structure, comprising an inner core and a shell coating the inner core, wherein
the inner core comprises Li1+xMn1−yAyP1−zRzO4, wherein x is −0.100 to 0.100, y is 0.001 to 0.500, z is 0.001 to 0.100, A is one or more selected from Zn, Al, Na, K, Mg, Mo, W, Ti, V, Zr, Fe, Ni, Co, Ga, Sn, Sb, Nb, and Ge, optionally one or more of Fe, Ti, V, Ni, Co, and Mg, and R is one or more selected from B, Si, N, and S; and
the shell comprises a first coating layer coating the inner core, a second coating layer coating the first coating layer, and a third coating layer coating the second coating layer, wherein
the first coating layer comprises a pyrophosphate of MP2O7 and a phosphate of XPO4, and M and X are each independently selected from one or more of Li, Fe, Ni, Mg, Co, Cu, Zn, Ti, Ag, Zr, Nb, and Al;
the second coating layer comprises carbon; and
the third coating layer comprises a polymer and the polymer comprises one or more selected from a polysiloxane with a linear structure and a polysiloxane with a cyclic structure.