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：US20230420653A1

公开(公告)日：2023-12-28

申请号：US18338393

申请日：2023-06-21

Applicant: Ningde Amperex Technology Limited

Inventor： Zigui Zheng ,  Zheng Yi ,  Yuansen Xie

IPC: H01M4/36 ,  H01M4/587 ,  H01M4/133

CPC classification number: H01M4/364 ,  H01M4/587 ,  H01M4/133 ,  H01M2004/021

Abstract: A negative active material includes composite particles. The composite particle includes a first region and a second region, where the first region includes a disordered carbon structure, and the second region includes an ordered carbon structure and/or a metal oxide structure. The negative active material of this application has a high gram capacity and active ion diffusion coefficient, so that a secondary battery containing such negative active material has a high energy density and excellent cycling performance, rate performance, and fast charging capacity.