| abstract |
The present invention relates to a core material having a layered crystal structure composed of element Li, metal M and oxygen; And a surface layer composed of a mixture of an element of the core material and an inorganic N-based oxide, wherein the Li content is stoichiometrically adjusted to be used as a cathode material in a rechargeable battery , the metal M type M = Co 1 - a M 'is represented by a, wherein a is a to 0.05 or less than 0, M' is at least one metal of the group consisting of Al, Ga and B, N is Mg, Ti And at least one metal selected from the group consisting of Fe, Cu, Ca, Ba, Y, Sn, Sb, Na, Zn, Zr and Si. |