The present invention provides a powderous lithium transition metal oxide with the composition as represented by the below Formula and prepared by solid state reaction in air from a mixed transition metal precursor and Li.sub.2CO.sub.3, with being practically free of Li.sub.2CO.sub.3 impurity: Li.sub.xM.sub.yO.sub.2 wherein M=M'.sub.1-kA.sub.k, where M'=Ni.sub.1-a-b(Ni.sub.1/2Mn.sub.1/2).sub.aCo.sub.b on condition of 0.65.ltoreq.a+b.ltoreq.0.85 and 0.1.ltoreq.b.ltoreq.0.4; A is a dopant; and 0.ltoreq.k.ltoreq.0.05; and x+y=2 on condition of 0.95.ltoreq.x.ltoreq.1.05. The Ni-based lithium transition metal oxide according to the present invention has a well-layered structure, and also improved safety, cycling stability and stability against aging and low gas evolution during storage, when used as an active material for cathode of lithium secondary batteries, because it has a high sintering stability and is substantially free of soluble bases.Moreover, the lithium transition metal oxide of the present invention can be prepared by a low-cost process using a mixed transition metal precursor and Li.sub.2CO.sub.3 as raw stocks and under relatively unrestricted conditions.

 
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