Cobalt doped lithiated vanadium oxides LiV3-xCoxO8 as a promising cathode material for secondary lithium batteries are prepared with the hydrothermal method.The crystal structure and morphology are characterized by powder X-ray diffraction and scanning electron microscope.The electrochemical properties of synthesized samples are investigated by galvanostatic charge and discharge cycling.With x increasing,the initial capacity of LiV3-xCoxO8 decreases to some extent.On the other hand,the cycle ability of Co d...