Electrostatic spray deposition of porous Fe2V4O13 films as electrodes for Li-ion batteries

► Fe2V4O13 is rarely investigated for its electrochemical properties. ► It is found that amorphous film has small amounts of Fe2+ and V4+ ions which lead to both Fe3+/Fe2+ and V5+/V4+ mixed valences and enhanced electronic conductivity. ► The lithiation and delithiation are reversible in the voltage range of 2.5-4.0 V.