公开(公告)号：US20220199996A1

公开(公告)日：2022-06-23

申请号：US17690252

申请日：2022-03-09

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Qunchao LIAO ,  Hang CUI ,  Yuansen XIE ,  Chao WANG

IPC: H01M4/587 ,  H01M4/38 ,  H01M4/04 ,  H01M4/36 ,  H01M10/0525 ,  H01M4/1395 ,  H01M4/1393 ,  H01M4/66

Abstract: A negative electrode material includes a silicon-based material and a carbon material. Peaks with a shift range of 1255˜1355 cm−1 and 1575˜1600 cm−1 in a Raman spectrum of the carbon material are a D peak and a G peak respectively. Peaks with a shift range of 1255˜1355 cm−1 and 1575˜1600 cm−1 in a Raman spectrum of the silicon-based material are the D peak and the G peak respectively. A scattering peak intensity ratio of D versus G peaks of the carbon material is A, and a scattering peak intensity ratio of D versus G peaks of the silicon-based material is B. 0.15≤A≤0.9, 0.8≤B≤2.0, and 0.2

公开(公告)号：US20220223835A1

公开(公告)日：2022-07-14

申请号：US17708508

申请日：2022-03-30

Applicant: Ningde Amperex Technology Limited

Inventor： Chao WANG ,  Qunchao LIAO ,  Hang CUI ,  Yuansen XIE

IPC: H01M4/131 ,  H01M4/62 ,  H01M4/485 ,  H01M4/66 ,  H01M10/0525

Abstract: A negative electrode includes a negative current collector and a negative active material layer. The negative active material layer includes a silicon-based material. A weight ratio R of the silicon-based material to a total weight of the negative active material layer and an absolute strength σ of the negative current collector satisfy the following formula: K=σ/(1.4×R+0.1), where K is a relation coefficient, and the relation coefficient is greater than or equal to 4,000 N/m. The electrochemical device can effectively mitigate XY expansion and deformation of the negative active material layer by using the foregoing negative electrode, thereby enhancing cycle performance and safety performance of the electrochemical device.