US 11,949,093 B2
Positive active material, positive electrode plate, electrochemical energy storage apparatus, and apparatus
Rui Du, Ningde (CN); Na Liu, Ningde (CN); Yongchao Liu, Ningde (CN); Sihui Wang, Ningde (CN); Deyu Zhao, Ningde (CN); and Xue Leng, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LTD., Ningde (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed on Dec. 23, 2020, as Appl. No. 17/132,567.
Application 17/132,567 is a continuation of application No. PCT/CN2019/129365, filed on Dec. 27, 2019.
Claims priority of application No. 201811646958.2 (CN), filed on Dec. 29, 2018.
Prior Publication US 2021/0126245 A1, Apr. 29, 2021
Int. Cl. H01M 4/134 (2010.01); H01M 4/02 (2006.01); H01M 4/131 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/134 (2013.01) [H01M 4/131 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); H01M 2220/20 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A positive active material, wherein
the positive active material is LixNiyCozMkMepOrAm or LixNiyCozMkMepOrAm whose surface is provided with a coating layer, wherein 0.85≤x≤1.15, 0<y<1, 0<z<1, 0<k<1, 0≤p≤0.1, 1≤r≤2, 0≤m≤1, m+r≤2, M is one or two selected from Mn and Al, Me is one or more selected from Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, Sr, Sb, Y, W, and Nb, and A is one or more selected from N, F, S, and Cl; and
the positive active material is secondary particles, a particle size Dn10 of the positive active material satisfies: 0.5 μm≤Dn10≤3 μm, a particle size Dv10 of the positive active material is 2.5 μm to 8 μm, and Dn10 and Dv10 satisfy 1≤Dn10×Dv10≤20, wherein
Dn10 is a corresponding particle size when a cumulative number distribution percentage of the positive active material reaches 10%, and
Dv10 is a corresponding particle size when a cumulative volume distribution percentage of the positive active material reaches 10%.