COBALT STABILIZED LAYERED LITHIUM-NICKEL OXIDES, CATHODES IN LITHIUM RECHARGEABLE CELLS

In the present paper the effect of cobalt, as substituent, on the stabilization of layered lithium-nickel oxides has been shown. Using an original method of synthesis, the series LiCo1-xNixO2 (O<x<1), has been obtained and analysed by X-ray powder diffraction. The electrochemical characteristics has been obtained in a three-electrode glass cell using standard electrolyte of 1 M LiClO4 in propylene carbonate:dimethyoxyethene. It has been demonstrated by cyclic voltammetry that the reversibility in the ternary Li-Ni-Co-O system increases with the Co content due to the enhanced stability and structural order of materials.