| abstract |
A lithium metal oxide powder used as a cathode material in a rechargeable battery, comprising a core material and a surface layer, the core having a layered crystal structure composed of an element Li and a metal M, wherein the Li content is stoichiometrically controlled Where the metal M has the chemical formula M=Co 1-a M' a ,0 a 0.05, wherein M' is a metal in one or more of the group consisting of Al, Ga, and B; and the surface layer is composed of a mixture of an element of the core material and an N-based inorganic oxide, wherein the N is one or more A metal in the group consisting of Mg, Ti, Fe, Cu, Ca, Ba, Y, Sn, Sb, Na, Zn, Zr, and Si. |