公开(公告)号：US20230035380A1

公开(公告)日：2023-02-02

申请号：US17935125

申请日：2022-09-25

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Xue Leng ,  Hongyu Liu ,  Changfeng Bie ,  Na Liu ,  Wanqing Cai

IPC: H01M4/58 ,  H01M10/0525

Abstract: A positive active material is provided. In some embodiments, the positive material includes: a substrate and a coating layer coating the substrate, wherein the coating layer includes a fast ion conductor layer and a carbon coating layer, the substrate includes more than one compound of formula (I): LiFe1-aM1aPO4 formula (I), in formula (I), M1 is more than one selected from Cu, Mn, Cr, Zn, Pb, Ca, Co, Ni, Sr, Nb and Ti, and 0≤a≤0.01; the fast ion conductor layer includes a fast ion conductor of a NASICON structure shown in formula (II), Li3-bFe2-bM2b(PO4)3 formula (II), in formula (II), M2 is more than one selected from Ti, Zr, Hf, Ge and Sn with valence of +4, and 0≤b≤1.