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.

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.