Patent ID: 8980475
Filing Date: 2015-03-17
Classification: C01G,C01P,H01B,H01M,Y02E

Abstract:
1. A process for preparing a lithium mixed metal oxide, the process comprising a) thermally treating a mixture (A) in the presence of oxygen with continual mixing to form an intermediate (B), wherein: the mixture (A) comprises a transition metal compound comprised of manganese, cobalt, and nickel, and a lithium salt (L); the intermediate (B) comprises a lithium-comprising mixed metal hydroxide and a lithium-comprising mixed metal oxide hydroxide, where manganese, cobalt and nickel are comprised in the ratio (1-a-b):a:b, and the oxidation state averaged over all ions of manganese, cobalt and nickel is at least 4-1.75a-1.75b, such that 0≦a≦0.5 and 0.1≦b≦0.8; and the lithium salt (L) does not melt during the thermal treatment; and b) thermally treating the intermediate (B) without mixing and in the presence of oxygen, to form the lithium mixed metal oxide comprising lithium, manganese, cobalt and nickel having a stoichiometric ratio of lithium to all transition metals of greater than 1, wherein the temperature of said thermally treating in a) is from 310° C. to 400° C.