公开(公告)号：US20230042519A1

公开(公告)日：2023-02-09

申请号：US17957179

申请日：2022-09-30

Applicant: Ningde Amperex Technology Limited

Inventor： Chao Wang ,  Ting Zhang ,  Daoyi Jiang ,  Hang Cui

IPC: H01M4/36 ,  H01M4/62 ,  H01M50/46 ,  H01M4/38 ,  H01M4/583

Abstract: A negative electrode material includes a composite of a silicon-based material (1), a polymer (2), and carbon nanotubes (3), where the polymer (2) contains a first group and a second group, the first group is chemically bonded to the carbon nanotubes (3), and the second group is chemically bonded to the silicon-based material (1). Both the carbon nanotubes (3) and the polymer (2) containing two groups are applied to surfaces of particles of the silicon-based material (1). The two groups of the polymer (2) are chemically bonded to the silicon-based material (1) and the carbon nanotubes (3) respectively, so that bonding force between the silicon-based material (1) and the carbon nanotubes (3) is enhanced and a uniform carbon nanotube (3) coating layer is formed. This can significantly improve conductive performance of the silicon-based material (1), thereby improving cycling performance and rate performance of an electrochemical apparatus.