公开(公告)号：US20220199975A1

公开(公告)日：2022-06-23

申请号：US17690272

申请日：2022-03-09

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Zhihuan CHEN ,  Ting YI ,  Daoyi JIANG ,  Hang CUI

IPC: H01M4/36 ,  H01M4/38 ,  H01M4/587 ,  H01M4/62 ,  H01M10/0525

Abstract: A negative electrode composite material includes a Si—M—C composite material. A conductive layer exists on a surface of the Si—M—C composite material, M includes at least one of boron, nitrogen, or oxygen. Chemical shifts of a silicon element in the Si—M C composite material as measured in a solid-state nuclear magnetic resonance test include −5 ppm±5 ppm, −35 ppm±5 ppm, −75 ppm±5 ppm, −110 ppm±5 ppm. A peak width at half height at −5 ppm±5 ppm is K, and K satisfies: 7 ppm