A novel cathode material, lithium decavanadate Li6V10O28 with a large tunnel within the framework structure for lithium ion battery has been prepared by hydrothermal synthesis and annealing dehydration treatment. The structure and electrochemical properties of the sample have been investigated. The novel material shows good reversibility for Li+ insertion/extraction and long cycle life. High discharge capacity (132mAh/g) is obtained at 0.2mA/cm2 discharge current and potential range between 2.0 and 4.2V versus Li+/Li. AC impedance of the Li/Li6V10O28 cell reveals that the cathode process is controlled mainly by Li+ diffusion in the active material. The novel material would be a promising cathode material for Li-ion batteries.