Development and characterization of Li-ion capacitor pouch cells

摘要

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 C-rate. After 10,000 cycles, the LIC pouch cell still has 80% of the initial capacitance. The average leakage current is 0.3 μa cm~(-2) during the first 72 h.