公开(公告)号：US10164249B2

公开(公告)日：2018-12-25

申请号：US14831871

申请日：2015-08-20

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Xiangpeng Fang ,  Chengren Wu ,  Na Liu ,  Xuguang Gao

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/131 ,  H01M4/525 ,  C01G51/00 ,  C01G53/00

Abstract: The present invention provides a positive active material for use in a secondary lithium battery, a method for preparing the positive active material and a secondary lithium battery containing the positive active material. The positive active material includes a core of lithium transition metal oxide represented by Formula LixMyN1-yO2-αAβ and a coating layer of lithium transition metal silicate represented by Formula x′Li2O.y′N′Oa.SiO2-λBζwhich in-situ formed on the core, wherein 0.8≤x≤1.3, 0.6≤y≤1.0, 0.01≤x′≤2.1, 0.2≤y′≤1.5, 0.1≤a≤3.0, 0≤α≤0.2, 0≤β≤0.4, 0≤λ≤0.5, 0≤ζ≤0.5. The positive active material according to the present invention has high capacity, desirable cycling performance and safety performance, as well as desirable thermal stability.