Carbon hybrid as anode material for super lithium ion capacitor

Series of carbon hybrids as anode materials were prepared for super lithium ion capacitor using graphite and active carbon (AC) as raw materials. Their electrochemical properties were investigated by constant current charge-discharge test. The results showed that the compound anode had good capacitive performance as well as Li-ion battery performance. The potential of the capacitor could be as high as 3.5 V vs Li/Li⁺ when compared with 2.5 V vs Li/Li⁺ in the AC-AC capacitor, accordingly, the energy density increased from 21.7 to 40.3 Wh/kg. The compound anode also had excellent rate performance that as the current density increasing from 0.1 to 1 A/g, the capacitance decreased only 1.3 F/g, and good cycle performance that the capacitance holding remained 96.7% after 10 times cycles even at the highest potential of 3.5 V vs Li/Li⁺.