公开(公告)号：US20190044135A1

公开(公告)日：2019-02-07

申请号：US15577290

申请日：2017-08-24

申请人： Contemporary Amperex Technology Co., Limited

发明人： RUI DU ,  Na LIU ,  Yongchao LIU ,  Sihui WANG ,  Zhongling XU ,  Chao YANG

IPC分类号： H01M4/505 ,  H01M4/62 ,  H01M4/525 ,  H01M4/50

摘要： The disclosure provides a modified positive electrode active material, a preparation method thereof, and an electrochemical energy storage device. The modified positive electrode active material comprises positive electrode active material substrate; first oxide layer, coated on the surface of the positive electrode active material substrate and selected from one or more of oxides of element M being selected from the group of one or more of Li, Al, Zr, Mg, Ti, Y, Si, Ca, Cr, Fe, Zn, Nb, Sn, Ba, and Cd; and second oxide layer having a continuous layered structure, coated on the surface of the first oxide layer and selected from one or more of oxides of element M′ being selected from one or more of Li, B, P, As, Pb, V, Mo, and Sn. High temperature storage performance and cycling performance of electrochemical energy storage device are improved by the modified positive electrode active material.