公开(公告)号：US20220223851A1

公开(公告)日：2022-07-14

申请号：US17707129

申请日：2022-03-29

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Ting YI ,  Hang CUI ,  Yuansen XIE

IPC: H01M4/38 ,  H01M4/583 ,  H01M4/62 ,  H01M10/0525

Abstract: A negative electrode includes a negative current collector, a first negative active material layer and a second negative active material layer. The first negative active material layer is arranged on one side of a first portion of the negative current collector, and the second negative active material layers are arranged on two sides of a second portion, different from the first portion, of the negative current collector. A ratio of a weight per unit area of the first negative active material layer to a weight per unit area of the second negative active material layer on the negative current collector is 0.47 to 0.52, and a ratio of a compacted density of the first negative active material layer to a compacted density of the second negative active material layer is 0.9 to 1.1.

公开(公告)号：US20220199975A1

公开(公告)日：2022-06-23

申请号：US17690272

申请日：2022-03-09

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

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

IPC: H01M4/36 ,  H01M4/38 ,  H01M4/587 ,  H01M4/62 ,  H01M10/0525

Abstract: A negative electrode composite material includes a Si—M—C composite material. A conductive layer exists on a surface of the Si—M—C composite material, M includes at least one of boron, nitrogen, or oxygen. Chemical shifts of a silicon element in the Si—M C composite material as measured in a solid-state nuclear magnetic resonance test include −5 ppm±5 ppm, −35 ppm±5 ppm, −75 ppm±5 ppm, −110 ppm±5 ppm. A peak width at half height at −5 ppm±5 ppm is K, and K satisfies: 7 ppm

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：US20220223852A1

公开(公告)日：2022-07-14

申请号：US17708230

申请日：2022-03-30

Applicant: Ningde Amperex Technology Limited

Inventor： Ting YI

IPC: H01M4/38 ,  H01M4/583 ,  H01M4/62 ,  H01M10/0569

Abstract: A negative electrode material includes a silicon-based material, or a silicon-based material and graphite. The silicon-based material includes a silicon oxide material and a carbon layer located on a surface of the silicon oxide material. A particle size distribution of the silicon-based material satisfies 1≥(Dn99−Dn10)/Dn50≥4, Dn10≤1 μm, and Dn50≤3 μm. In the negative electrode material, a number distribution of particle sizes of the silicon-based material can be controlled so that large and small particles are better matched, thereby improving cycling performance of an electrochemical apparatus.