公开(公告)号：US20250125341A1

公开(公告)日：2025-04-17

申请号：US18715249

申请日：2022-11-29

Applicant: OCI COMPANY LTD.

Inventor： Joonhyun CHANG ,  Minho NOH ,  Minkyung OH ,  Eunok CHI

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

Abstract: The present invention provides a method for preparing a negative electrode material for a secondary battery, comprising a high-quality nano-silicon-carbon composite material formed by uniformly and densely coating the surface of nano-silicon particles with a pitch. Further, the present invention provides a negative electrode material, for a secondary battery, prepared by the method for preparing the negative electrode material for a secondary battery, and a secondary battery comprising same, in order to enhance the initial discharge capacity, initial efficiency, and life characteristics of the secondary battery.

公开(公告)号：US20250054951A1

公开(公告)日：2025-02-13

申请号：US18722854

申请日：2022-12-09

Applicant: OCI COMPANY LTD.

Inventor： Minkyung OH ,  Minho NOH ,  Joonhyun CHANG ,  Eunok CHI

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/587

Abstract: According to a method for manufacturing an anode active material for a secondary battery of the present invention, in manufacturing an anode active material for a secondary battery, having: i) a structure in which a pitch coating layer is formed on a composite material comprising nano silicon and amorphous carbon; or ii) a structure of a graphite core and a nano silicon-pitch shell surrounding the core, a pitch coating layer is formed by using two types of solvent, thereby improving uniformity and density of the pitch coating layer. In addition, an anode material for a secondary battery, comprising the anode active material for a secondary battery of the present invention, can improve initial discharge capacity, initial coulombic efficiency, and cycle life characteristics of a secondary battery.