公开(公告)号：US11108051B2

公开(公告)日：2021-08-31

申请号：US15968654

申请日：2018-05-01

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yujun Chen ,  Xinliang Kuang ,  Long Wang ,  Na Liu ,  Huan Ni

IPC: H01M4/62 ,  H01M4/36 ,  H01M4/525 ,  B01J13/08 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/04 ,  H01M4/1391 ,  H01M4/131 ,  H01M4/02

Abstract: The present disclosure provides a modified positive electrode active material. The modified positive electrode active material comprises a positive electrode active material inner core; a metal oxide layer comprising a metal oxide and coated on a surface of the positive electrode active material inner core; and a polymer layer comprising a polymer and coated on a surface of the metal oxide layer, the polymer being one or more selected from a group consisting of polyacrylic acid, polymethyl methacrylate, polyacrylamide and lithium polyacrylate. The modified positive electrode active material of the present disclosure has better structure stability and thermal stability, when the modified positive electrode active material is applied in the electrochemical energy storage device, cycle performance and safety performance of the electrochemical energy storage device can be significantly improved without decreasing energy density of the electrochemical energy storage device.

公开(公告)号：US10720643B2

公开(公告)日：2020-07-21

申请号：US15877403

申请日：2018-01-23

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Xinliang Kuang ,  Yujun Chen ,  Long Wang ,  Na Liu

IPC: H01M4/525 ,  H01M4/131 ,  H01M10/0525 ,  H01M4/02

Abstract: The present invention provides a positive electrode material for a lithium ion battery including a nickel-containing positive electrode material and a coating layer coated on the nickel-containing positive electrode material, wherein the nickel-containing positive electrode material has a chemical formula of LiNixM1-xO2, 0.5≤x≤1, M is at least one of Co, Mn and Al, and the coating layer contains lithium vanadium phosphate and silica. Compared with the prior art, the coating layer containing lithium vanadium phosphate and silica coated on the nickel-containing positive electrode material of the present invention can remarkably improve the dynamic performances and the cycle performances at high voltage of the lithium ion battery. In addition, the present invention also provides a method for preparing the positive electrode material a lithium ion battery containing the positive electrode material.

公开(公告)号：US10784508B2

公开(公告)日：2020-09-22

申请号：US15976713

申请日：2018-05-10

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Huan Ni ,  Yujun Chen ,  Xinliang Kuang ,  Xuguang Gao ,  Long Wang ,  Na Liu

IPC: H01M4/36 ,  C01B25/36 ,  C01G53/00 ,  H01M4/62 ,  H01M4/505 ,  H01M10/0525 ,  H01M4/525 ,  H01M10/052 ,  H01M4/04 ,  H01M4/1391 ,  H01M4/131 ,  H01M4/02

Abstract: The present disclosure provides a preparation method of a modified positive electrode active material preparation method, which comprising steps of: dispersing a positive electrode active material matrix into an alcohol solvent to form a positive electrode active material matrix suspension; dissolving an alcohol-soluble aluminum salt in an alcohol solvent to form an alcohol-soluble aluminum salt solution; dissolving an alcohol-soluble phosphorous compound in an alcohol solvent to form an alcohol-soluble phosphorous compound solution; mixing the alcohol-soluble aluminum salt solution and the alcohol-soluble phosphorous compound solution and heating to react, obtaining a liquid-phase coating solution which contains aluminum phosphate after the reaction is finished; mixing and stirring the positive electrode active material matrix suspension and the liquid-phase coating solution which contains aluminum phosphate, extraction filtrating and obtaining a filter cake after the stirring is finished, then drying and baking the filter cake, finally obtaining a modified positive electrode active material.

公开(公告)号：US20180212242A1

公开(公告)日：2018-07-26

申请号：US15877403

申请日：2018-01-23

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Xinliang Kuang ,  Yujun Chen ,  Long Wang ,  Na Liu

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/131 ,  H01M4/02

Abstract: The present invention provides a positive electrode material for a lithium ion battery including a nickel-containing positive electrode material and a coating layer coated on the nickel-containing positive electrode material, wherein the nickel-containing positive electrode material has a chemical formula of LiNixM1-xO2, 0.5≤x≤1, M is at least one of Co, Mn and Al, and the coating layer contains lithium vanadium phosphate and silica. Compared with the prior art, the coating layer containing lithium vanadium phosphate and silica coated on the nickel-containing positive electrode material of the present invention can remarkably improve the dynamic performances and the cycle performances at high voltage of the lithium ion battery. In addition, the present invention also provides a method for preparing the positive electrode material a lithium ion battery containing the positive electrode material.