公开(公告)号：US11177475B2

公开(公告)日：2021-11-16

申请号：US16392113

申请日：2019-04-23

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Qi Wu ,  Jinhua He ,  Changyin Ji ,  Tao Qiao ,  Kelun Wang

IPC: H01M4/525 ,  C01G53/00 ,  H01M4/505 ,  H01M10/0525 ,  H01M4/02

Abstract: The present disclosure relates to a ternary positive electrode material and a battery using the ternary positive electrode material. The ternary positive electrode material includes secondary particles composed of primary particles. The secondary particles have an average particle diameter D50 of 6 μm-20 μm, BET of 0.2 m2/g-1 m2/g, and the number σ of primary particles per unit area of the secondary particles is 5 particles/μm2-100 particles/μm2. The ternary positive electrode material has a formula of Li1+a[NixCoyMnzM1bM2c]O2−dNd, where element M1 and element M2 are each independently selected from at least one of Al, Zr, Ti, Mg, Zn, B, Ca, Ce, Te and Fe, element N is selected from at least one of F, Cl and S, and 0

公开(公告)号：US11527752B2

公开(公告)日：2022-12-13

申请号：US17131012

申请日：2020-12-22

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Qi Wu ,  Jinhua He ,  Changyin Ji

IPC: H01M4/525 ,  H01M4/505 ,  H01M10/0525 ,  H01M4/36 ,  C01G53/00 ,  H01M4/02

Abstract: This application provides a positive active material and a preparation method thereof, an electrochemical battery, a battery module, a battery pack, and an apparatus. The positive active material includes an inner core and a coating layer, where the coating layer coats a surface of the inner core. The inner core is selected from a ternary material with a molecular formula of Li1+a[NixCoyMnzMbM′c]O2−dYd, where distribution of each of the doping elements M, M′, and Y in the inner core meets the following condition: there is a reduced mass concentration gradient from an outer side of the inner core to a center of the inner core. The positive active material herein features high gram capacity, high structural stability, and high thermal stability, so that the electrochemical battery has excellent cycle performance and storage performance and high initial discharge gram capacity.