US 11,996,548 B2
Negative active material, preparation method thereof, secondary battery and related battery module, battery pack and device
Chengdu Liang, 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)
Appl. No. 16/973,152
Filed by Contemporary Amperex Technology Co., Limited, Ningde (CN)
PCT Filed Jul. 14, 2020, PCT No. PCT/CN2020/101816
§ 371(c)(1), (2) Date Dec. 8, 2020,
PCT Pub. No. WO2021/017810, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 201910687980.X (CN), filed on Jul. 29, 2019.
Prior Publication US 2022/0140318 A1, May 5, 2022
Int. Cl. H01M 4/38 (2006.01); H01M 4/36 (2006.01); H01M 4/48 (2010.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/483 (2013.01); H01M 4/62 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A negative active material comprising a core structure and a polymer coating layer coated on at least a part of the outer surface of the core structure, wherein the core structure comprises silicon-based materials;
wherein the negative active material has an infrared spectrum comprising an infrared absorption peak at the wavelength of 1450 cm−1 to 1690 cm−1, and the infrared absorption peak has a transmittance T that satisfies 85%≤T≤98.5%, as measured according to the description,
wherein the coating layer comprises carbon element and comprises —C═C— linkage, and
wherein the coating layer comprises nitrogen element and comprises —C═N— linkage.