US 12,034,153 B2
Secondary battery, process for preparing the same and apparatus containing the secondary battery
Jianjun Ma, Ningde (CN); Rui Shen, Ningde (CN); and Libing He, Ningde (CN)
Assigned to Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed by Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed on Dec. 10, 2021, as Appl. No. 17/547,271.
Application 17/547,271 is a continuation of application No. PCT/CN2020/088299, filed on Apr. 30, 2020.
Prior Publication US 2022/0102710 A1, Mar. 31, 2022
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/366 (2013.01) [H01M 4/0404 (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)] 17 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, and the negative electrode film comprises a first negative electrode film and a second negative electrode film;
the first negative electrode film is disposed on at least one surface of the negative electrode current collector and comprises a first negative electrode active material;
the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material,
the first negative electrode active material comprises natural graphite and satisfies: 0.60≤S1≤0.74, where S1=W2H/(W3R+W2H);
the second negative electrode active material comprises artificial graphite,
the first negative electrode film is thicker than the second negative electrode film, and
a thickness ratio of the first negative electrode film to the second negative electrode film is from 1:1.01 to 1:1.1,
in which W3R is a peak area of 101 crystal plane in a X-ray diffraction spectrum of the first negative electrode active material at a diffraction angle of 43.3±0.05°, and W2H is a peak area of 101 crystal plane in a X-ray diffraction spectrum of the first negative electrode active material at a diffraction angle of 44.5±0.05°.