公开(公告)号：US20230369591A1

公开(公告)日：2023-11-16

申请号：US18349219

申请日：2023-07-10

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yuqun ZENG ,  Baida DENG ,  Meng KANG ,  Erling LI ,  Libing HE

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

CPC classification number: H01M4/583 ,  H01M4/0471 ,  H01M4/622 ,  H01M4/625 ,  H01M2004/021

Abstract: This application discloses a negative-electrode active material and a preparation method thereof, a secondary battery, and a battery module, a battery pack, and an apparatus that include such secondary battery. The negative-electrode active material includes a core and a coating layer covering at least part of a surface of the core, where the core includes artificial graphite, the coating layer includes amorphous carbon, a volume-based particle size distribution of the negative-electrode active material satisfies Dv99≤24 μm, a volume-based median particle size Dv50 of the negative-electrode active material satisfies 8 μm≤Dv50≤15 μm, Dv99 is a particle size corresponding to a cumulative volume distribution percentage of the negative-electrode active material reaching 99%, and Dv50 is a particle size corresponding to a cumulative volume distribution percentage of the negative-electrode active material reaching 50%.

公开(公告)号：US20220416244A1

公开(公告)日：2022-12-29

申请号：US17822260

申请日：2022-08-25

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yuqun ZENG ,  Baida DENG ,  Meng KANG ,  Erling LI ,  Libing HE

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

Abstract: This application discloses a negative-electrode active material and a preparation method thereof, a secondary battery, and a battery module, a battery pack, and an apparatus that include such secondary battery. The negative-electrode active material includes a core and a coating layer covering at least part of a surface of the core, where the core includes artificial graphite, the coating layer includes amorphous carbon, a volume-based particle size distribution of the negative-electrode active material satisfies Dv99≤24 μm, a volume-based median particle size Dv50 of the negative-electrode active material satisfies 8 μm≤Dv≤15 μm, Dv99 is a particle size corresponding to a cumulative volume distribution percentage of the negative-electrode active material reaching 99%, and WO is a particle size corresponding to a cumulative volume distribution percentage of the negative-electrode active material reaching 50%.

公开(公告)号：US20230268505A1

公开(公告)日：2023-08-24

申请号：US18138742

申请日：2023-04-25

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Baida DENG ,  Meng KANG ,  Chen ZENG ,  Libing HE

IPC: H01M4/583 ,  H01M10/0568 ,  H01M10/0569 ,  H01M4/58 ,  H01M4/04

CPC classification number: H01M4/583 ,  H01M10/0568 ,  H01M10/0569 ,  H01M4/5825 ,  H01M4/0471 ,  H01M2004/027

Abstract: This application provides a negative electrode active material and a preparation method thereof. The negative electrode active material may be self-embedded graphite composed of graphite A and graphite B, where the surface of the graphite A may have a tenon structure, the surface of the graphite B may have a mortise structure, the tenon structure of the graphite A and the mortise structure of the graphite B may be mutually embedded, and a hydrogen bond may be formed between the tenon structure of the graphite A and the mortise structure of the graphite B.

公开(公告)号：US20220328831A1

公开(公告)日：2022-10-13

申请号：US17853229

申请日：2022-06-29

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Erling LI ,  Meng KANG ,  Baida DENG ,  Libing HE

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

Abstract: A secondary battery, a preparation method thereof, and an apparatus including the secondary battery are described. Specifically, the secondary battery includes a negative-electrode plate, where the negative-electrode plate is of a multi-layer structure, and the multi-layer structure sequentially includes: a negative-electrode current collector, a primer layer, and a negative-electrode film layer; the negative-electrode film layer includes a first negative-electrode film layer and a second negative-electrode film layer, and the first negative-electrode film layer is located between the primer layer and the second negative-electrode film layer; and the first negative-electrode film layer includes a first negative-electrode active material, the first negative-electrode active material includes first artificial graphite, at least some particles in the first artificial graphite are secondary particles, and a quantity proportion A of the number of the secondary particles to a total number of particles of the first negative-electrode active material satisfies A≥50%.