公开(公告)号：US10700344B2

公开(公告)日：2020-06-30

申请号：US16199246

申请日：2018-11-26

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Meng Kang ,  Tianquan Peng ,  Yuliang Shen ,  Jiazheng Wang ,  Libing He

IPC: H01M4/133 ,  H01M4/583 ,  H01M10/0525 ,  H01M10/48 ,  H01M4/02

Abstract: The disclosure relates to a negative electrode plate and a secondary battery comprising the same. Specifically, the present disclosure provides a negative electrode plate comprising a negative electrode current collector and a negative electrode layer coated on at least one surface of the negative electrode current collector, the negative electrode layer comprising a negative electrode active material, wherein the negative electrode active material comprises a graphite material, and the negative electrode layer fulfills the condition: 0.45≤7.8/D50+1.9*D50/(VOI)2≤3.1, wherein D50 represents a volume distribution average particle diameter of particles of the negative electrode active material in micron; VOI represents the OI value of the negative electrode layer. The negative electrode plate can allow that a secondary battery containing the same has the combination of high energy density, fast charge, and long cycle life.

公开(公告)号：US20190097271A1

公开(公告)日：2019-03-28

申请号：US16199240

申请日：2018-11-26

Applicant: Contemporary Amperex Technology CO., Limited

Inventor： Jiazheng WANG ,  Meng Kang ,  Tianquan Peng ,  Yuliang Shen ,  Libing He

IPC: H01M10/0583 ,  H01M10/04 ,  H01M4/04 ,  H01M4/66

Abstract: The disclosure relates to a negative electrode plate and a secondary battery comprising the same. Specifically, the disclosure provides a negative electrode plate comprising a negative electrode current collector and a negative electrode layer coated on at least one surface of the negative electrode current collector, the negative electrode layer comprising a negative electrode active material, wherein the negative electrode active material comprises graphite, and the negative electrode layer meets: 4×L×VOI−¼×Dn10≤25, wherein L represents the thickness of single-side negative electrode layer on the negative electrode current collector in millimeter; Dn10 represents the particle diameter corresponding to 10% of the number distribution of particles of the negative electrode active material in micrometer; VOI represents the orientation index of the negative electrode layer. The negative electrode plate can allow that a secondary battery containing the same has the combination of high energy density, fast charge, and long cycle life.

公开(公告)号：US20240313202A1

公开(公告)日：2024-09-19

申请号：US18669551

申请日：2024-05-21

Applicant: Contemporary Amperex Technology Co,. Limited

Inventor： Jiazheng WANG ,  Meng Kang ,  Xiaobin Dong ,  Yuliang Shen ,  Libing He

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/587

CPC classification number: H01M4/366 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/587 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2220/20

Abstract: The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the same. In particular, the secondary battery comprises a negative electrode plate, and the negative electrode plate comprises a negative current collector and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film and a second negative electrode film, the first negative electrode film is disposed on at least one surface of the negative current collector and comprises a first negative electrode active material; the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material, and the second negative electrode active material comprises secondary particles, a number percentage of which is greater than or equal to 20%, wherein the first negative electrode active material comprises natural graphite and the second negative electrode active material comprises artificial graphite.

公开(公告)号：US12027695B2

公开(公告)日：2024-07-02

申请号：US17566713

申请日：2021-12-31

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jiazheng Wang ,  Meng Kang ,  Xiaobin Dong ,  Yuliang Shen ,  Libing He

IPC: H01M4/36 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/587 ,  H01M4/02

CPC classification number: H01M4/366 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/587 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2220/20

Abstract: The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. In particular, the secondary battery comprises a negative electrode plate, and the negative electrode plate comprises a negative current collector and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film and a second negative electrode film, the first negative electrode film is disposed on at least one surface of the negative current collector and comprises a first negative electrode active material, the first negative electrode active material comprises graphite; the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material, the second negative electrode active material comprises artificial graphite, and the second negative electrode active material comprises secondary particles, the number percentage of which is greater than or equal to 20%.

公开(公告)号：US11901557B2

公开(公告)日：2024-02-13

申请号：US17547277

申请日：2021-12-10

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Meng Kang ,  Xiaobin Dong ,  Jiazheng Wang ,  Libing He

IPC: H01M4/587 ,  H01M4/04 ,  H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M4/133 ,  H01M4/02

CPC classification number: H01M4/587 ,  H01M4/0404 ,  H01M4/133 ,  H01M4/366 ,  H01M4/505 ,  H01M4/525 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2004/028 ,  H01M2220/20

Abstract: The present application discloses a negative electrode active material and a method for preparing the same, a secondary battery, and an apparatus including the secondary battery. The negative electrode active material includes a core and a coating layer covering the surface of the core, the core includes artificial graphite, the coating layer includes amorphous carbon, and the particle size uniformity of the negative electrode active material is from 0.25 to 0.45.

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.

公开(公告)号：US11682788B2

公开(公告)日：2023-06-20

申请号：US17810646

申请日：2022-07-05

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Xiaobin Dong ,  Jiazheng Wang ,  Meng Kang ,  Libing He

IPC: H01M10/0525 ,  H01M4/04 ,  H01M4/587 ,  H01M4/66 ,  H01M4/02

CPC classification number: H01M10/0525 ,  H01M4/0404 ,  H01M4/587 ,  H01M4/661 ,  H01M2004/021 ,  H01M2004/027

Abstract: Embodiments provide a secondary battery and an apparatus containing the secondary battery. The secondary battery includes a negative electrode plate. The negative electrode plate includes a copper-based current collector and a negative electrode film layer disposed on at least one surface of the copper-based current collector and including a negative electrode active material, and the negative electrode active material includes graphite. The negative electrode plate satisfies Tx≥25, where Tx is as defined in the specification.

公开(公告)号：US20220336844A1

公开(公告)日：2022-10-20

申请号：US17810610

申请日：2022-07-04

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Meng Kang ,  Xiaobin Dong ,  Jiazheng Wang ,  Libing He

IPC: H01M10/0525 ,  H01M4/587 ,  H01M4/04 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M10/04

Abstract: Embodiments provide a secondary battery and a preparation method thereof, and a battery module, battery pack, and apparatus containing such secondary battery. In those embodiments, a negative electrode plate includes a negative-electrode current collector and a negative-electrode film layer that is disposed on at least one surface of the negative-electrode current collector and that includes a negative-electrode active material. The negative-electrode active material contains graphite, and the negative electrode plate satisfies that, when the negative electrode plate and a lithium metal sheet constitute a button battery which is discharged to 5.0 mV at 0.05C, a capacity increment curve V-dQ/dV of the button battery has a third-order lithiation phase transition peak of graphite at position 0.055V-0.085V.

公开(公告)号：US20200280048A1

公开(公告)日：2020-09-03

申请号：US16875124

申请日：2020-05-15

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Meng Kang ,  Tianquan Peng ,  Yuliang Shen ,  Jiazheng Wang ,  Libing He

IPC: H01M4/133 ,  H01M4/583 ,  H01M10/0525

Abstract: The disclosure relates to a secondary battery comprising a negative electrode plate the same. Specifically, the present disclosure provides secondary battery, comprising a negative electrode plate, the negative electrode plate comprises a negative electrode current collector and a negative electrode layer coated on at least one surface of the negative electrode current collector, the negative electrode layer comprising a negative electrode active material, wherein the negative electrode active material comprises a graphite material, and the negative electrode layer fulfills the condition: 0.75≤7.8/D50+1.9*D50/(VOI)2≤2.0, wherein D50 represents a volume distribution average particle diameter of particles of the negative electrode active material in micron; VOI represents the OI value of the negative electrode layer. The secondary battery has the combination of high energy density, fast charge, and long cycle life.

公开(公告)号：US20240356013A1

公开(公告)日：2024-10-24

申请号：US18760050

申请日：2024-07-01

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

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

IPC: H01M4/36 ,  C01B32/21 ,  H01M4/02 ,  H01M4/48 ,  H01M4/587

CPC classification number: H01M4/366 ,  C01B32/21 ,  H01M4/48 ,  H01M4/587 ,  C01P2004/80 ,  C01P2006/40 ,  H01M2004/021 ,  H01M2004/027

Abstract: Provided are a negative active material, a method for preparing same, a secondary battery containing same, and an electrical device. The negative active material includes a natural graphite substrate of a porous structure and a functional material distributed in pores of the natural graphite substrate, and the functional material includes amorphous carbon and a titanium-containing compound. The negative active material provided in this application exhibits excellent kinetic performance, and the secondary battery provided herein exhibits excellent fast-charging performance and cycle performance.