Lithium-ion and magnesium-ion CoO-layered electrode materials,are potential material for both high-power and high-capacity lithium ion cells.In this paper,the synthesis,structural and electrochemical characterization of Li11Mg2Co3O15 electrodes is explored.Particular attention is given to the electrode composition Li11Mg2Co3O15in which the magnesium ions are tetravalent and,when fully discharged,Electrochemical charge/discharge profiles and cyclic voltammogram data suggest that the possibility of new material,generated in cycled electrodes,particularly at low lithium loadings.The study emphasizes that find one new kinds of electrode material to reversible lithium insertion and extraction.