公开(公告)号：US20230062442A1

公开(公告)日：2023-03-02

申请号：US17974775

申请日：2022-10-27

Applicant: Ningde Amperex Technology Limited

Inventor： Ting YI ,  Zhihuan CHEN ,  Hang CUI ,  Yuansen XIE

IPC: H01M4/38 ,  H01M4/36

Abstract: A composite negative electrode material includes a Si-M-C composite material and graphene on a surface of the Si-M-C composite material, where M includes at least one of boron, nitrogen, or oxygen. Solid state nuclear magnetic resonance testing of the Si-M-C composite material shows that chemical shifts of element silicon include −5 ppm±5 ppm, −35 ppm±5 ppm, −75 ppm±5 ppm, and −110 ppm±5 ppm, and a peak width at half height at −5 ppm±5 ppm satisfies 7 ppm

公开(公告)号：US20220328840A1

公开(公告)日：2022-10-13

申请号：US17708279

申请日：2022-03-30

Applicant: Ningde Amperex Technology Limited

Inventor： Daoyi JIANG ,  Zhihuan CHEN

IPC: H01M4/62 ,  H01M4/48 ,  H01M4/36

Abstract: An anode material, including a matrix material, and the matrix material comprises carbon-doped silicon monoxide, and a content of the carbon ranges from 0.5% to 10% based on a total mass of the carbon and silicon monoxide. The anode material can significantly improve the cycle performance of an electrochemical device at room temperature and high temperature.

公开(公告)号：US20220223854A1

公开(公告)日：2022-07-14

申请号：US17708501

申请日：2022-03-30

Applicant: Ningde Amperex Technology Limited

Inventor： Daoyi JIANG ,  Zhihuan CHEN ,  Ting ZHANG ,  Hang CUI

IPC: H01M4/38 ,  H01M4/62 ,  H01M4/134

Abstract: A negative electrode material includes silicon-based particles. The silicon-based particles include a silicon-containing matrix and a polymer layer disposed on at least a portion of a surface of the silicon-containing matrix, and the polymer layer includes a carbon material and a polymer; when a thermogravimetric analysis is conducted at a temperature ranging from 0° C. to 800° C., a derivative thermogravimetric curve of the polymer in a free state has at least one characteristic peak, a temperature at the maximum characteristic peak of the at least one characteristic peak is Ti, a derivative thermogravimetric curve of the silicon-based particles has at least one characteristic peak, a temperature at the maximum characteristic peak of the at least one characteristic peak is T2, and T1-T2 is from 1.5° C. to 20° C. A lithium-ion battery prepared from the negative active material has improved cycle performance and deformation resistance, and reduced DC resistance.

公开(公告)号：US20220199969A1

公开(公告)日：2022-06-23

申请号：US17690257

申请日：2022-03-09

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Daoyi JIANG ,  Zhihuan CHEN ,  Hang CUI ,  Yuansen XIE

IPC: H01M4/134 ,  H01M4/62

Abstract: An anode material includes a silicon composite substrate, wherein the Dv50 of the silicon composite substrate is from 2.5 μm to 15 μm, and the particle size distribution of the silicon composite substrate meets 0.1≤Dn10/Dv50≤0.6. The anode material has good cycle performance, and the battery prepared with the anode material has good rate performance and lower swelling rate.

公开(公告)号：US20220140322A1

公开(公告)日：2022-05-05

申请号：US17577739

申请日：2022-01-18

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Zhihuan CHEN ,  Daoyi JIANG ,  Hang CUI ,  Yuansen XIE

IPC: H01M4/36 ,  H01M4/60 ,  H01M4/48 ,  H01M10/0525

Abstract: An anode material includes silicon-containing particles including a silicon composite substrate and an oxide MeOy layer, wherein the oxide MeOy layer is coated on at least a portion of the silicon composite substrate, wherein Me includes at least one of Al, Si, Ti, Mn, V, Cr, Co or Zr, and y is 0.5 to 3; and wherein the oxide MeOy layer includes a carbon material. The anode material has good cycle performance, and the battery prepared from the anode material has better rate performance and lower swelling rate.

公开(公告)号：US20230343946A1

公开(公告)日：2023-10-26

申请号：US18342044

申请日：2023-06-27

Applicant: Ningde Amperex Technology Limited

Inventor： Daoyi JIANG ,  Zhihuan CHEN

IPC: H01M4/62 ,  H01M4/583 ,  H01M4/48

CPC classification number: H01M4/48 ,  H01M4/583 ,  H01M4/622 ,  H01M2004/027

Abstract: A negative electrode material includes silicon monoxide particles. A molar ratio A of oxygen to silicon on a surface of the silicon monoxide particle is greater than a molar ratio B of oxygen to silicon inside the silicon monoxide particle, so that the molar ratio A of oxygen to silicon on the surface of the silicon monoxide particle and a molar ratio B of oxygen to silicon at any point above 25 nm from the surface of the silicon monoxide particle satisfy A/B > 1.5, allowing the electrochemical apparatus to have a smaller volume swelling and better cycling performance during charge and discharge cycles.

公开(公告)号：US20230343943A1

公开(公告)日：2023-10-26

申请号：US18342039

申请日：2023-06-27

Applicant: Ningde Amperex Technology Limited

Inventor： Zhihuan CHEN ,  Daoyi JIANG

IPC: H01M4/38 ,  H01M4/62 ,  H01M10/0525 ,  H01M4/134 ,  C01B33/18

CPC classification number: H01M4/386 ,  H01M4/625 ,  H01M4/622 ,  H01M10/0525 ,  H01M4/134 ,  C01B33/18 ,  H01M2004/027

Abstract: A negative electrode material including a silicon compound SiOx, a first conductive layer, and a second conductive layer; where 0.5≤x≤1.5; at least part of the first conductive layer is present between the silicon compound and the second conductive layer; and the first conductive layer includes graphene, and the second conductive layer includes carbon nanotubes. This application further provides a negative electrode material different from the above negative electrode material in that the first conductive layer includes carbon nanotubes and the second conductive layer includes graphene. An electrochemical apparatus having the negative electrode material combines the advantages of graphene and carbon nanotubes, to obtain long cycle life and low swelling rate.

公开(公告)号：US20220223850A1

公开(公告)日：2022-07-14

申请号：US17707059

申请日：2022-03-29

Applicant: Ningde Amperex Technology Limited

Inventor： Zhihuan CHEN ,  Daoyi JIANG ,  Hang CUI ,  Yuansen XIE

IPC: H01M4/38 ,  H01M4/04 ,  H01M4/583 ,  H01M10/0525

Abstract: A negative electrode includes a current collector and a coating located on the current collector. The coating includes silicon-based particles and graphite particles. The silicon-based particles include a silicon-containing substrate and a polymer layer. The polymer layer includes a polymer and carbon nanotubes. The polymer layer is located on at least a part of a surface of the silicon-containing substrate. A minimum value of film resistances at different positions on a surface of the coating is R1, a maximum value of the film resistances is R2, an R1/R2 ratio is M, and a percentage of a weight of the silicon-based particles in a total weight of the silicon-based particles and the graphite particles is N, where M≥0.5, and N is 2 wt %-80 wt %.