LITHIUM TRANSITION METAL COMPOSITE OXIDE AND METHOD OF PRODUCTION

The present invention relates to a lithium transition metal composite oxide capable of being used as a positive electrode (cathode) active material for non-aqueous electrolyte lithium secondary batteries having a general formula 1 Li1+a(1-x-y-z)M1xM2yM3(1-a)(1-x-y-z)M3'a(1-x-y-z)M4zO2+a(1-x-y-z), [formula 1]in which 0.7 ≤ x < 1, y = (1 - x)/2, 0 ≤ z ≤ 0.05 and 0 < a(1-x-y-z) ≤ 0.05, and where M1 is Ni having an oxidation state of three, M2 is one or more ions having an oxidation state of three, M3' and M3 are identically one or more ions with at least one ion being Mn, wherein ions M3' have an oxidation state of four and ions M3 have an oxidation state of three, and M4 is one or more ions of Mg, Al and B. Further, the present invention relates and a method for preparing the lithium transition metal composite oxide and to a non-aqueous electrolyte lithium secondary battery containing the lithium transition metal composite oxide