公开(公告)号：US20240120483A1

公开(公告)日：2024-04-11

申请号：US18374695

申请日：2023-09-29

Applicant: Ningde Amperex Technology Limited

Inventor： Yuxin CAI ,  Yusheng CHEN ,  Jiali DONG

IPC: H01M4/587 ,  H01M4/133

CPC classification number: H01M4/587 ,  H01M4/133 ,  H01M2004/021

Abstract: A negative electrode active material includes graphite and amorphous carbon, where according to Raman testing, the negative electrode active material satisfies: 1.6≤WD/WG≤2.6, where WD is a peak width at half height of peak D within 1340 cm−1 to 1370 cm−1 in the Raman spectrum, 40 cm−1≤WD≤100 cm−1, and WG is a peak width at half height of peak G within 1570 cm−1 to 1590 cm−1, 15 cm−1≤WG≤50 cm−1. The negative electrode active material undergoes surface treatment, where the surface thereof has a higher surface lattice defect degree, effectively improving a gram capacity and kinetics performance thereof, thereby making the electrochemical apparatus including the negative electrode active material have both high energy density and good electrochemical performance.

公开(公告)号：US20240021775A1

公开(公告)日：2024-01-18

申请号：US18373981

申请日：2023-09-28

Applicant: Ningde Amperex Technology Limited

Inventor： Yuxin CAI ,  Pengyang FENG ,  Jiali DONG ,  Yuansen XIE

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

CPC classification number: H01M4/0404 ,  H01M10/0525 ,  H01M4/583 ,  H01M2004/027

Abstract: A negative electrode includes a current collector and a negative active material layer disposed on the current collector. The negative active material layer includes negative active material particles. The negative active material particles include secondary particles. The negative active material layer includes a pore A. A diameter of the pore A is 59 nm to 73 nm when tested by a mercury intrusion porosimetry. A ratio C004/C110 of the negative active material layer is 6 to 20. The electrochemical device using the negative electrode according to this application possesses a relatively high capacity and improved performance of resistance to cycle expansion.

公开(公告)号：US20220223865A1

公开(公告)日：2022-07-14

申请号：US17708288

申请日：2022-03-30

Applicant: Ningde Amperex Technology Limited

Inventor： Pengyang FENG ,  Yuxin CAI ,  Jiali DONG ,  Yuansen XIE

IPC: H01M4/583 ,  H01M10/0525

Abstract: A negative electrode active material having a median particle size D1v50, the negative electrode active material has a median particle size D2v50 under a pressure of 1 t, and D2v50/D1v50 is not less than 0.8. The negative electrode active material achieves a balance between high capacity and high cycle expansion performance of an electrochemical device.

公开(公告)号：US20240405204A1

公开(公告)日：2024-12-05

申请号：US18679434

申请日：2024-05-30

Applicant: Ningde Amperex Technology Limited

Inventor： Yusheng CHEN ,  Yuxin CAI ,  Jiali DONG

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/04 ,  H01M4/583

Abstract: A secondary battery according to this application includes a negative electrode. The negative electrode includes a current collector and a negative electrode active material layer disposed on a surface of the current collector. The negative electrode active material layer includes a first negative electrode active material layer and a second negative electrode active material layer. The first negative electrode active material layer is disposed between the current collector and the second negative electrode active material layer. The first negative electrode active material layer includes a first negative electrode active material, and the first negative electrode active material has a maximum rebound rate Ra; and the second negative electrode active material layer includes a second negative electrode active material, and the second negative electrode active material has a maximum rebound rate Rb; where 5%≤Ra≤13%, 10%≤Rb≤17%, and Ra

公开(公告)号：US20230026799A1

公开(公告)日：2023-01-26

申请号：US17947751

申请日：2022-09-19

Applicant: Ningde Amperex Technology Limited

Inventor： Pengyang FENG ,  Yuxin CAI ,  Jiali DONG ,  Yuansen XIE

IPC: H01M4/587 ,  H01M4/62

Abstract: An anode active material, and an electrochemical device and electronic device using such anode active material. Also, an anode active material, including graphite. Controlling a graphitization degree of particles of different particle sizes of the anode active material can achieve a balance between kinetic performance and first cycle efficiency of the electrochemical device.