公开(公告)号：US20230420637A1

公开(公告)日：2023-12-28

申请号：US18365233

申请日：2023-08-04

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Meng Kang ,  Guangping Dai ,  Libing He ,  Baida Deng ,  Chen Zeng

IPC: H01M4/04 ,  H01M4/583 ,  H01M4/62

CPC classification number: H01M4/0471 ,  H01M2004/027 ,  H01M4/625 ,  H01M4/583

Abstract: Provided are a modified graphite and a preparation method thereof, a carbon-coated negative active material and a preparation method thereof, a negative electrode plate, a secondary battery, a battery module, a battery pack, and an electrical device. The preparation method of a modified graphite includes the following steps: (S10) providing a graphite substrate; and (S20) heat-treating the graphite substrate in a micro-oxidizing atmosphere to obtain the modified graphite, where the micro-oxidizing atmosphere includes a reactive gas, and the reactive gas is one or more selected from CO2, O2, and O3. The preparation method of a carbon-coated negative active material includes the following steps: (S100) providing a negative active material substrate; and (S200) heat-treating the negative active material substrate and a carbonaceous precursor in a micro-oxidizing atmosphere to obtain the carbon-coated negative active material, where the micro-oxidizing atmosphere includes a reactive gas.