公开(公告)号：US20240021809A1

公开(公告)日：2024-01-18

申请号：US18074784

申请日：2022-12-05

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Zhe LI ,  Qili SU ,  Yong LU ,  Haijing LIU ,  Lianqi ZHANG ,  Yiming SUN

IPC: H01M4/525 ,  H01M4/36 ,  H01M4/62 ,  H01M10/0562 ,  H01M10/0525

CPC classification number: H01M4/525 ,  H01M4/366 ,  H01M4/62 ,  H01M10/0562 ,  H01M10/0525 ,  H01M2004/028

Abstract: The present disclosure provides a positive electroactive material for an electrochemical cell that cycles lithium ions. The positive electroactive material includes a nickel-rich material including a plurality of solid-state particles. Each solid-state particle has a heterogeneous structure that includes a core and a shell that at least partially coats the core. The core includes a nickel-cobalt-manganese material, and the shell includes a nickel-cobalt-aluminum material. When the nickel-rich material is represented by LiNi(1-x-y-z)CoxMnyAl2O2, the nickel-cobalt-manganese material is represented by LiNi(i-x″-(y/a))Cox″Mn(y/a)O2, and the nickel-cobalt-aluminum material is represented by LiNi(i-x″-(z/b))Cox″Al(z/b)O2, where (i) 1-x-y-z>0.5, (ii) a+b=1, (iii) zx″+bx″=x, and (iv) 1-x″-(y/a)>1-x″-(z/b). In certain variations, the core and the shell define a base structure, and the heterogeneous structure further includes a buffer layer that at least partially coats the base structure.