US 11,695,112 B2
Negative electrode active material, process for preparing the same, and secondary battery, battery module, battery pack and apparatus related to the same
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)
Filed by Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed on Dec. 17, 2021, as Appl. No. 17/553,839.
Application 17/553,839 is a continuation of application No. PCT/CN2020/103253, filed on Jul. 21, 2020.
Claims priority of application No. 201910689510.7 (CN), filed on Jul. 29, 2019.
Prior Publication US 2022/0140325 A1, May 5, 2022
Int. Cl. H01M 4/04 (2006.01); H01M 4/38 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/386 (2013.01) [H01M 4/0416 (2013.01); H01M 4/387 (2013.01); H01M 2004/027 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A negative electrode active material, comprising a core material and a polymer-modified coating layer on at least part of a surface of the core material;
wherein
the core material comprises one or more of a silicon-based negative electrode material and a tin-based negative electrode material;
the polymer-modified coating layer comprises sulfur element and carbon element;
the sulfur element has a mass percentage of from 0.2% to 4% in the negative electrode active material;
the carbon element has a mass percentage of from 0.5% to 4% in the negative electrode active material;
the polymer-modified coating layer comprises —S—C— bond; and
the polymer-modified coating layer further comprises —S—S— bond.