公开(公告)号：US20220123314A1

公开(公告)日：2022-04-21

申请号：US17563071

申请日：2021-12-28

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Chengdu LIANG ,  Yuzhen ZHAO ,  Yinglie GUAN ,  Yan WEN ,  Qisen HUANG

IPC: H01M4/62 ,  H01M4/36 ,  H01M4/04 ,  H01M10/0525

Abstract: The present application provides a negative electrode active material, a process, a battery, a battery module, a battery pack and an apparatus related to the same. The negative electrode active material comprises a core material and a polymer modified coating on at least a part of a surface of core material; wherein the core material is one or more of a silicon-based negative electrode material and a tin-based negative electrode material; the negative electrode active material has a weight loss rate satisfying 0.2%≤weight loss rate≤2% in a thermogravimetric analysis test wherein temperature is elevated from 25° C. to 800° C. under a non-oxidizing inert gas atmosphere. The present application can reduce damage to the surface structure of the negative electrode active material, reduce loss of active ions and capacity, meanwhile can well improve coulomb efficiency and cycle performance of the battery.