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：US20220093925A1

公开(公告)日：2022-03-24

申请号：US17542533

申请日：2021-12-06

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Rui SHEN ,  Jianjun MA ,  Libing HE

IPC: H01M4/587 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M4/58

Abstract: This application discloses a secondary battery and an apparatus containing the secondary batteries. The secondary battery includes a positive electrode plate and a negative electrode plate, the positive electrode plate comprising a positive electrode current collector and a positive electrode film comprising a positive active material; the negative electrode plate comprising a negative electrode current collector and a negative electrode film comprising a negative electrode active material, wherein the positive active material comprises one or more of layered lithium transition metal oxides and modified compounds thereof, the negative electrode active material comprises artificial graphite and natural graphite, and the negative electrode plate satisfies 0.02≤I3R(012)/I2H(100)≤0.18, alternatively the positive active material comprises one or more of lithium-containing phosphates with olivine structure and modified compounds thereof, the negative electrode active material includes artificial graphite and natural graphite, and the negative electrode plate satisfies 0.04≤I3R(012)/I2H(100)≤0.22.

公开(公告)号：US20220059864A1

公开(公告)日：2022-02-24

申请号：US17519601

申请日：2021-11-05

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Yuliang SHEN ,  Meng KANG ,  Jiazheng WANG ,  Libing HE

IPC: H01M10/04 ,  H01M4/04

Abstract: The present application relates to a negative electrode plate and a secondary battery. Specifically, the present application provides a negative electrode plate comprising a negative electrode current collector and an negative electrode film coated on at least one surface of the negative electrode current collector and containing the negative active material, wherein the negative electrode plate satisfies 0.6≤0.7×P×(D90−D10)/D50+B/3≤8.0, wherein P refers to the porosity of the negative electrode film; B refers to the active specific surface area of the negative electrode film, and the unit thereof is m2/g; D10 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 10%, D90 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 90%, and D50 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 50%.

公开(公告)号：US20210399301A1

公开(公告)日：2021-12-23

申请号：US17463525

申请日：2021-08-31

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Libing HE

IPC: H01M4/587 ,  H01M4/133 ,  C01B32/20 ,  C01B32/205

Abstract: The present application discloses an artificial graphite, a secondary battery, a preparation method and an apparatus. The artificial graphite includes secondary particles formed by agglomeration of primary particles, the artificial graphite having a volume average particle size Dv50, denoted as A, the artificial graphite through powder compaction under a pressure of 2000 kg having a volume average particle size Dv50, denoted as B, wherein A and B satisfies: B/A≥0.85. Using the artificial graphite provided by the present application can greatly reduce the cyclic expansion of the secondary battery.

公开(公告)号：US20210249650A1

公开(公告)日：2021-08-12

申请号：US16973903

申请日：2019-10-14

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Meng KANG ,  Yuliang SHEN ,  Jiazheng WANG ,  Libing HE

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M4/134 ,  H01M4/133 ,  H01M10/0525

Abstract: The present application provides a negative electrode sheet and a secondary battery. The negative electrode sheet includes a negative current collector and a negative electrode film provided on at least one surface of the negative current collector and comprising a negative active substance. The negative electrode sheet also satisfies: 0.3≤a×(1.1/b+0.02×c)≤6.0, where a represents the specific surface area of the negative electrode film, and the unit is m2/g; b represents the compaction density of the negative electrode film, and the unit is g/cm3; c represents the cohesive force between the negative electrode film and the negative current collector, and the unit is N/m. The present application can make the negative electrode sheet have excellent dynamics performance, and meanwhile ensure that the secondary battery has good dynamics performance and cycle performance without sacrificing energy density.

公开(公告)号：US20180062167A1

公开(公告)日：2018-03-01

申请号：US15662139

申请日：2017-07-27

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Rui SHEN ,  Libing HE ,  Shuli LI ,  Jianjun MA

IPC: H01M4/36 ,  H01M4/587 ,  H01M4/48 ,  H01M4/62

CPC classification number: H01M4/366 ,  C01B32/05 ,  C01B33/18 ,  C01P2004/61 ,  H01M4/48 ,  H01M4/483 ,  H01M4/587 ,  H01M4/625 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/027

Abstract: The present application relates to the field of secondary batteries and, particularly, relates to a negative electrode material for the secondary battery, a method for preparing the same, and a secondary battery containing the same. The negative electrode material includes a kernel particle, a connection carbon layer, a conductive carbon microparticle, the connection carbon layer is coated on a surface of the kernel particle, and the conductive carbon microparticle is distributed on a surface of the connection carbon layer. A high-molecular polymer is used as binder. A layer of conductive carbon microparticle is uniformly coated on a surface of the negative electrode active material, so that a stable and effective conductive network is formed in the electrode plate, thereby significantly improving a dynamic performance of the negative electrode material and providing a battery containing the negative electrode material with high rate performance and fast charging capability.

公开(公告)号：US20240363864A1

公开(公告)日：2024-10-31

申请号：US18769457

申请日：2024-07-11

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Yuanyuan LI ,  Jianjun MA ,  Rui SHEN ,  Libing HE

IPC: H01M4/587 ,  C01B32/205 ,  H01M4/02 ,  H01M10/0525

CPC classification number: H01M4/587 ,  C01B32/205 ,  H01M10/0525 ,  C01P2004/50 ,  C01P2004/51 ,  C01P2004/61 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/40 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2220/20

Abstract: The present application discloses a secondary battery, an apparatus including the secondary battery, artificial graphite and a method for the preparation thereof. The secondary battery includes a negative electrode plate including a negative active material, wherein the negative active material includes an artificial graphite having a numerical particle size Dn10 of at least 1 μm; the artificial graphite has a graphitization degree of 90% to 95%; and the negative electrode plate has an OI value of at most 15, wherein the OI value of the negative electrode plate represents a ratio C004/C110, in which C004 is the peak area of the diffraction peak of 004 crystal plane of the artificial graphite in the negative electrode plate and C110 is the peak area of the diffraction peak of 110 crystal plane of the artificial graphite in the negative electrode plate.

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：US20230183073A1

公开(公告)日：2023-06-15

申请号：US17942080

申请日：2022-09-09

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Zilong SONG ,  Rui SHEN ,  Libing HE

IPC: C01B32/205 ,  H01M10/052

CPC classification number: C01B32/205 ,  H01M10/052 ,  C01P2004/53 ,  C01P2004/61

Abstract: A method for preparing a modified graphite includes performing crushing on coal-based needle coke to obtain a first material, performing shaping fine powder removal on the first material to obtain a second material, performing heat treatment on the second material in a reaction kettle and then cooling the second material after the heat treatment to room temperature to obtain a third material, and performing graphitization on the third material in a graphitization furnace and then cooling the third material after the graphitization to room temperature to obtain the modified graphite.

公开(公告)号：US20230098119A1

公开(公告)日：2023-03-30

申请号：US17959188

申请日：2022-10-03

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yuanyuan LI ,  Rui SHEN ,  Libing HE

IPC: H01M4/583 ,  H01M10/0525 ,  H01M4/04

Abstract: This application provides a negative electrode plate, including an active layer 1 and an active layer 2. The active layer 1 contains an active material 1, and the active layer 2 contains an active material 2. A powder OI value of the active material 1 falls in a range of 8 to 32, and a powder OI value of the active material 2 falls in a range of 2 to 7. A gram capacity of the active material 1 falls in a range of 290 to 350 mAh/g, and a gram capacity of the active material 2 falls in a range of 350 to 368 mAh/g. A ratio α of the powder OI value between the active material 1 and the active material 2 falls in a range of 2.00 to 6.25.