Process of making cathode material containing Ni-based lithium transition metal oxide

A process for production of a lithium transition metal oxide comprising:

• (a) combining solid Li2CO3 and a solid mixed transition metal precursor to form a mixture;
• (b) performing a solid state reaction of the mixture in air, wherein the air supplied is at least 2 m3 for 10 hour per 1 of the lithium transition metal oxide;
• and
• (c) forming at least about 5 kg of the lithium transition metal oxide, the lithium transition metal oxide having the composition of the general formula
• Lix((Ni1−a−b(Ni1/2Mn1/2)aCob)1−kAk)2−xO2,
• wherein 0.65≦a+b≦0.85, 0.1≦b≦0.4,
• A is a dopant,
• 0≦k<0.05, and
• 0.95≦x≦1.05.