公开(公告)号：US20250046784A1

公开(公告)日：2025-02-06

申请号：US18793181

申请日：2024-08-02

Applicant: Ningde Amperex Technology Limited

Inventor： Fujin Tan ,  Zigui Zheng ,  Wenlong Shao ,  Yuansen Xie

IPC: H01M4/133 ,  H01M4/02 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/0569

Abstract: An electrochemical device includes a negative electrode plate and an electrolyte solution. The negative electrode plate includes a negative current collector and a negative active material layer, and the negative active material layer is located on the negative current collector. The negative active material layer includes a negative active material, the negative active material includes hard carbon and graphite, and a mass percent of the hard carbon in the negative active material is w. The electrolyte solution includes at least one of ethyl propionate or propyl propionate. A mass percent of the ethyl propionate and/or propyl propionate in the electrolyte solution is v, 5≤v/w≤21. The synergistic effect between the hard carbon and the electrolyte solvent enables the electrochemical device to meet requirements of both a high energy density and cost-effectiveness, and improves the low-temperature performance and C-rate performance of the electrochemical device.

公开(公告)号：US20250006889A1

公开(公告)日：2025-01-02

申请号：US18758800

申请日：2024-06-28

Applicant: Ningde Amperex Technology Limited

Inventor： Zheng Yi ,  Fujin Tan ,  Wenlong Shao ,  Yuansen Xie

IPC: H01M4/133 ,  C01B32/05 ,  C01B32/21 ,  H01M4/02 ,  H01M4/36 ,  H01M4/587 ,  H01M10/0525

Abstract: A negative electrode includes: a negative electrode current collector and a negative electrode active material layer located on at least one surface of the negative electrode current collector. The negative electrode active material layer includes a negative electrode active material, where the negative electrode active material includes graphite and hard carbon. Based on a total mass of the hard carbon, a ratio of a mass of element hydrogen to a mass of element carbon in the hard carbon is W1, and based on a total mass of the graphite, a ratio of a mass of element hydrogen to a mass of element carbon in the graphite is W2, a value of W1/W2 being within a range of 5 to 19. The electrochemical apparatus has reduced impedance and improved rate performance and cycling performance.