公开(公告)号：US20240421289A1

公开(公告)日：2024-12-19

申请号：US18814587

申请日：2024-08-26

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Liangbin Liu ,  Jiazheng Wang ,  Zijian Lv ,  Yuan Li ,  Jingxian Deng ,  Donggen Xiong ,  Xiaobin Dong

IPC: H01M4/36 ,  C01B32/21 ,  H01M4/02 ,  H01M4/587 ,  H01M10/0525

Abstract: Provided are a negative electrode active material and a preparation method thereof, a secondary battery, and an electric apparatus. The negative electrode active material includes: a core material; and a first coating layer provided on at least part of a surface of the core material, where the first coating layer includes a porous carbon material and nano silicon-based particles, and the nano silicon-based particles are embedded into pore structures of the porous carbon material.

公开(公告)号：US20240274805A1

公开(公告)日：2024-08-15

申请号：US18636204

申请日：2024-04-15

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Kai Wu ,  Zijian Lv ,  Jiazheng Wang ,  Liangbin Liu ,  Jingxian Deng

IPC: H01M4/38 ,  H01M4/02 ,  H01M4/04 ,  H01M4/36 ,  H01M4/583

CPC classification number: H01M4/386 ,  H01M4/0421 ,  H01M4/364 ,  H01M4/366 ,  H01M4/583 ,  H01M2004/021 ,  H01M2004/027

Abstract: The present application provides a negative electrode active material, a secondary battery comprising the same and an electrical device, wherein the negative electrode active material comprises a matrix material and a silicon-based material, the matrix material comprises a plurality of pore structures, at least a part of the silicon-based material is located in pore structures of the matrix material, at least a part of the silicon-based material has a crystalline structure, the silicon-based material comprises a first silicon-based material and a second silicon-based material with different grain sizes, and a ratio of grain size of the first silicon-based material to grain size of the second silicon-based material is greater than or equal to 1.6. The negative electrode active material can result in a secondary battery having high energy density, high First Coulombic Efficiency, long cycle life and long storage life at the same time.