US 12,230,791 B2
Positive electrode active material, method for the preparation thereof, positive electrode plate, secondary battery and electrical device containing the same
Qingyan Ma, Ningde (CN); Yan Wen, Ningde (CN); Yingjie Guan, Ningde (CN); Yuzhen Zhao, Ningde (CN); and Qisen Huang, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on May 20, 2024, as Appl. No. 18/668,268.
Application 18/668,268 is a continuation of application No. PCT/CN2022/084856, filed on Apr. 1, 2022.
Prior Publication US 2024/0304798 A1, Sep. 12, 2024
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/505 (2010.01); H01M 4/58 (2010.01); H01M 4/587 (2010.01); H01M 4/60 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/505 (2013.01); H01M 4/5825 (2013.01); H01M 4/587 (2013.01); H01M 4/602 (2013.01); H01M 2004/028 (2013.01); H01M 2220/20 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A positive electrode active material having a core-shell structure, comprising a core and a shell cladding the core,
wherein the core has a chemical formula of Li1+xMn1-yAyP1-zRzO4, in which x is any value in a range of −0.100 to 0.100, y is any value in a range of 0.001 to 0.500, z is any value in the range of 0.001 to 0.100, A comprises Fe, V, and Co, and R is S;
the values of x, y, and z satisfy that an entire core is electrically neutral; and
the shell comprises a first cladding layer cladding the core, a second cladding layer cladding the first cladding layer, a third cladding layer cladding the second cladding layer and a fourth cladding layer cladding the third cladding layer,
wherein the first cladding layer comprises crystalline pyrophosphates LiaMP2O7 and/or Mb(P2O7)c, 0≤a≤2, 1≤b≤4, 1≤c≤6, in which the values of a, b and c satisfy that the crystalline pyrophosphate LiaMP2O7 or Mb(P2O7)c is electrically neutral, and in which each M in the crystalline pyrophosphates LiaMP2O7 and/or Mb(P2O7)c comprises Fe;
the second cladding layer comprises crystalline phosphate XPO4, X comprises Li and Fe;
the third cladding layer is carbon; and
the fourth cladding layer comprises a polymer comprising a polysaccharide.