US 12,355,069 B2
Secondary battery, process for preparing same, and apparatus comprising secondary battery
Yuwen Wang, Ningde (CN); Baozhen Wu, Ningde (CN); and Yonghuang Ye, 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 Dec. 10, 2021, as Appl. No. 17/547,228.
Application 17/547,228 is a continuation of application No. PCT/CN2020/088464, filed on Apr. 30, 2020.
Prior Publication US 2022/0102708 A1, Mar. 31, 2022
Int. Cl. H01M 4/36 (2006.01); H01M 4/04 (2006.01); H01M 4/38 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/0404 (2013.01); H01M 4/386 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 2220/20 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A secondary battery, comprising a negative electrode plate, wherein the negative electrode plate comprises a negative electrode current collector and a negative electrode film;
the negative electrode film comprises a first negative electrode coating layer and a second negative electrode coating layer;
the first negative electrode coating layer is disposed on at least one surface of the negative electrode current collector and comprises a first negative electrode active material, the first negative electrode active material comprises artificial graphite and a silicon-based material;
the second negative electrode coating layer is disposed on a surface of the first negative electrode coating layer and comprises a second negative electrode active material, and the second negative electrode active material comprises artificial graphite and a silicon-based material;
the silicon-based material is present at a mass percentage denoted as W1 in the first negative electrode active material, the silicon-based material is present at a mass percentage denoted as W2 in the second negative electrode active material, and the negative electrode plate satisfies: W2>W1 and W1+W2≤6%; and
the silicon-based material comprises a first silicon-based material and a second silicon-based material, and the first silicon-based material has a particle size smaller than that of the second silicon-based material and
the first silicon-based material has a particle size of greater than 0.05 μm and less than 7 μm; and
the second silicon-based material has a particle size of greater than 7 μm and less than 15 μm.