公开(公告)号：US20210013513A1

公开(公告)日：2021-01-14

申请号：US16969475

申请日：2019-11-15

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Wei LI ,  Qingrui XUE ,  Jing LI ,  Zige ZHANG ,  Jianbao XU

IPC: H01M4/62 ,  H01M4/66 ,  H01M4/36 ,  H01M4/137 ,  H01M4/131 ,  H01M4/134 ,  H01M4/525 ,  H01M4/505 ,  H01M4/133 ,  H01M10/0525

Abstract: This application relates to a positive electrode plate and an electrochemical device. The positive electrode plate comprises a metal current collector, a positive electrode active material layer and a safety coating disposed between the metal current collector and the positive electrode active material layer; the safety coating comprises a polymer matrix, a conductive material and an inorganic filler; the positive electrode active material layer comprises Li1+xNiaCobMe(1−a−b)O2, wherein −0.1≤x≤0.2, 0.6≤a

公开(公告)号：US20200161640A1

公开(公告)日：2020-05-21

申请号：US16422872

申请日：2019-05-24

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Wei LI ,  Haihao SHI ,  Huihui LIU ,  Chao JIN ,  Tianyi GAO ,  Jianbao XU ,  Shisong LI ,  Chao GUO

IPC: H01M4/36 ,  H01M4/62

Abstract: The present invention relates to a battery, comprising a positive electrode plate, a separator and a negative electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and at least two layers of positive active materials on at least one surface of the positive electrode current collector in which the underlying positive active material layer in contact with the positive electrode current collector comprises a first positive active material, a first polymer material, and a first conductive material and in which the upper positive active material layer comprises a second positive active material, a second polymer material, and a second conductive material and the first polymer material comprises an oil-dispersible polymer material having a solubility in NMP at 130° C. for 5 minutes, which is 30% or less of the solubility of PVDF under the same conditions. The battery exhibits good safety performance and improved electrical performance.