公开(公告)号：US20210167366A1

公开(公告)日：2021-06-03

申请号：US17123544

申请日：2020-12-16

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Xue LENG ,  Rui DU ,  Na LIU ,  Yongchao LIU ,  Huan NI

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/1315 ,  H01M4/525 ,  H01M4/505 ,  C30B29/22

Abstract: The present application provides a positive electrode sheet for a secondary battery, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer on a surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material includes a first lithium nickel transition metal oxide and a second lithium nickel transition metal oxide, the first lithium nickel transition metal oxide includes a first substrate and a first coating layer on a surface of the first substrate, the first substrate is secondary particles, and the second lithium nickel transition metal oxide is a single crystal or single-crystal-like morphological particles.

公开(公告)号：US20230062063A1

公开(公告)日：2023-03-02

申请号：US17938930

申请日：2022-09-06

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Hongyu LIU ,  Changfeng BIE ,  Xue LENG ,  Na LIU

IPC: H01M4/36 ,  H01M4/58 ,  H01M4/587 ,  H01M4/133 ,  H01M4/136 ,  H01M10/0525 ,  C01B25/45

Abstract: A positive active material made of carbon-coated lithium iron phosphate includes a lithium iron phosphate substrate, and a carbon coating layer on a surface of the substrate. The lithium iron phosphate substrate has a general structural formula LiFe1-aMaPO4, where M is at least one selected from Cu, Mn, Cr, Zn, Pb, Ca, Co, Ni, Sr, Nb, or Ti, and 0≤a≤0.01. A carbon coating factor of the carbon-coated lithium iron phosphate, η = BET ⁢ 1 BET ⁢ 2 , satisfies 0.81≤η≤0.95, where BET1 denotes a specific surface area of mesopore and macropore structures in the carbon-coated lithium iron phosphate, and BET2 denotes a total specific surface area of the carbon-coated lithium iron phosphate.

公开(公告)号：US20230170472A1

公开(公告)日：2023-06-01

申请号：US18084551

申请日：2022-12-20

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Changfeng BIE ,  Huan NI ,  Xue LENG ,  Miaomiao DONG ,  Shaocong OUYANG ,  Na LIU

IPC: H01M4/36 ,  H01M4/587 ,  H01M4/525 ,  H01M4/62

CPC classification number: H01M4/366 ,  H01M4/587 ,  H01M4/525 ,  H01M4/625 ,  H01M2004/028

Abstract: A positive electrode plate may include a current collector, a first positive electrode active material layer and a second positive electrode active material layer. The first positive electrode active material layer may comprise a first positive electrode active material, a first binder and a first conductive agent; the second positive electrode active material layer may comprise a second positive electrode active material, a second binder and a second conductive agent. The second positive electrode active material may be selected from carbon-coated LiβFeαM(1−α)PO4, and the second positive electrode active material may have a diffraction peak A between 29° and 30° in the X-ray diffraction pattern, and a diffraction peak B between 25° and 26°, and the intensity ratio IA/IB of the diffraction peaks may satisfy: 0.98≤IA/IB≤1.1.