公开(公告)号：US20240413399A1

公开(公告)日：2024-12-12

申请号：US18810521

申请日：2024-08-21

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Meng Qin ,  Yingjie Guan ,  Qingyan Ma ,  Huiling Yang ,  Yan Wen ,  Qisen Huang

IPC: H01M10/0567 ,  H01M4/04 ,  H01M4/62 ,  H01M10/054 ,  H01M10/0569 ,  H01M50/249

Abstract: Provided is a secondary battery including a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate includes a positive current collector and a positive active material layer arranged on the positive current collector, and the positive active material layer contains a sodium ion active material. The negative electrode plate includes a negative current collector and a metal film layer arranged on at least one surface of the negative current collector. A nucleation overpotential of sodium on the negative electrode plate is smaller than or equal to 35 mV. The electrolyte is arranged between the positive electrode plate and the negative electrode plate, and the electrolyte contains a sodium borate.

公开(公告)号：US20240304798A1

公开(公告)日：2024-09-12

申请号：US18668268

申请日：2024-05-20

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Qingyan Ma ,  Yan Wen ,  Yingjie Guan ,  Yuzhen Zhao ,  Qisen Huang

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/505 ,  H01M4/58 ,  H01M4/587 ,  H01M4/60

CPC classification number: H01M4/366 ,  H01M4/505 ,  H01M4/5825 ,  H01M4/587 ,  H01M4/602 ,  H01M2004/028 ,  H01M2220/20

Abstract: Provided are a positive electrode active material, a method for the preparation thereof and a positive electrode plate, a secondary battery and an electrical device containing the same. The positive electrode active material has a core-shell structure, comprising a core and a shell cladding the core, wherein the core has a chemical formula of Li1+xMn1-yAyP1-zRzO4, the shell comprises a first cladding layer cladding the core, a second cladding layer cladding the first cladding layer, a third cladding layer cladding the second cladding layer and a fourth cladding layer cladding the third cladding layer. The positive electrode active material of the present application enables the secondary battery to have a relatively high energy density, and good cycling performance, rate performance and safety performance.

公开(公告)号：US20230352674A1

公开(公告)日：2023-11-02

申请号：US18347456

申请日：2023-07-05

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Qingyan Ma ,  Yingjie Guan ,  Yuzhen Zhao ,  Yan Wen ,  Qisen Huang

IPC: H01M4/505 ,  H01M4/62 ,  H01M4/04

CPC classification number: H01M4/505 ,  H01M4/622 ,  H01M4/625 ,  H01M4/0471 ,  H01M4/0404 ,  H01M2004/028

Abstract: The present application provides a positive electrode active material, a preparation method therefor, a positive electrode plate, a secondary battery and a power consuming device containing same. The positive electrode active material has a core-shell structure, including an inner core and a coating layer coating at least a part of the inner core, wherein the inner core has a chemical formula of LiaAxMn1-yByP1-zCzO4-nDn, and the coating layer comprising a polymer which comprises one or more of plant polysaccharide, marine polysaccharide and their respective derivatives. The positive electrode active material of the present application enables a secondary battery to have a high energy density as well as significantly improved rate performance, cycling performance and/or high-temperature stability.