Electrochemical energy storage devices storage energy by reversibly convert electric energy to chemical energy either by faradic reaction or electric double-layer.The energy density,powder density,reversibility and cycling life are key parameters,which depend primarily on the electrode.Electrochemically active materials which participate faradic reactions in electrode usually suffer from low electron conductivity,especially for the cathode materials for lithium ion batteries and the oxides for supercapacitors,thereby delivering a limited power density.