Development and characterization of Li-ion capacitor pouch cells

High energy density Li-ion capacitor (LIC) pouch cell prototypes were assembled with lab-scale equipment using activated carbon cathode and hard carbon/lithium stabilized metal power (SLMP) anode. The specific energy and energy density as high as 30 Wh kg(-1) and 39 Wh L-1 have been achieved, respectively. The pouch cells can deliver over 50% of the maximum stored energy at a discharge rate over 100 Crate. After 10,000 cycles, the LIC pouch cell still has 80% of the initial capacitance. The average leakage current is 0.3 mu A cm(-2) during the first 72 h. (C) 2014 Published by Elsevier B.V.