Patent ID: 9614220
Date: 2017-04-04
CPC Classifications: C01G,C01P,H01M,Y02E,Y10T

Claim:
1. A powderous lithium metal oxide for a cathode material in a rechargeable battery comprising particles having the general composition Li x Co 1−a−b M 1 a M 2 b O 2−d with 0.97<x<1.01, 0.005≦a<0.10, 0.001≦b≦0.02, and −0.1≦d≦0.1, wherein M 1 is Ni and Mn, M 2 is either one or more metals from the group consisting of Al, Mg, Ca, Ti, and Zr, wherein the particles comprise a core P2 and a shell P1 wherein P1 consists of a plurality of islands densely sintered to the core P2, wherein the weight ratio P1/P2 is <0.5 and P1+P2=1, wherein the molar content of M 1 in P2 is less than in P1, and the molar content of (M 2 +Co) in P2 is more than in P1; and wherein P2 comprises at least 3 mole % of Ni and Mn and is a LiM″O 2 -based material with M″ comprising Co and M 2 ,and P1 is a LiMO 2 based material with M comprising Co, M 1 and M 2 .