The object of this invention is a process of making a cathode material for a secondary electrochemical battery including a lithium anode, wherein said material corresponds to one of the formulas Liy Ni2-y O2 and LiNi1-x Cox O2, wherein y is a number ranging from 0.84 to 1.22 and x is a number ranging from 0.09 to 0.5, wherein the starting materials are a mixture of lithium hydroxide and nickel oxi