Since the low initial coulombic efficiency could consume a large number of lithium ions in LICs without prelithiation to form the SEI film and insertion material structure, we first used the metal lithium electrode as the counter electrode to prelithiate the NFLF working electrode, and then the prelithiated NFLF electrode was removed from the pristine device and used as the anode together with cathode in the new device to assemble a LIC. The charge/discharge curves of a LIC assembled in 1 mol/L LiPF 6 in EC:DMC by coupling of lithium-inserted NFLF as anode and an activated porous carbon-based EDL electrode with the equal mass of NFLF and active carbon. The positive EDL electrode in Fig. displays symmetric charge/discharge curves in a narrow potential window of 3.4-3.5 V vs Li/Li + . Additionally, the minimum potential of the positive electrode is 2.2 V vs. Li/Li + , preventing any possible SEI formation on the AC surface , while the maximum potential of the latter electrode is below the electrolyte oxidation limit of 4.3 V vs. Li/Li + . The narrow potential window of the EDL electrode compared to the pseudocapacitive electrode (enlarged potential window of 0.1 to 1.0 V vs. Li/Li + ) indicates the high capacity and charge storage capability. Moreover, the minimum potential of the negative electrode is higher than 0 V vs. Li/Li + to avoid the lithium plating . Nevertheless, a relatively larger potential window for the pseudocapacitive electrode indicates a lower capacity compared to the carbon electrode at 2.5 mA/g (the specific current is based on the total mass of NFLF and carbon electrodes). The cell voltage shown in Fig. indicates an overall symmetric charge/discharge behavior of the LIC confirming the contribution from both electrodes and verifying the pseudocapacitance and EDL capacitance for anode and cathode, respectively, which is the structure we proposed in the introduction. To demonstrate the advantages of our proposed LICs, a series of electrochemical properties will be tested and compared to the literature. An energy density of 41 Wh/kg and a power density of 0.61 kW/kg has been estimated for the hybrid supercapacitor. Despite the gravimetric capacitance and energy values calculated per total mass of electrodes including the binder and conductivity additive, they are still comparable to the traditional Li-ion cells using a battery-like negative electrode . The LIC was cycled between 3.2-2.2 V at a high specific current of 50 mA/g for 10000 galvanostatic charge/discharge cycles. During the cycling period, galvanostatic charge-discharge curves were collected after every 1000 cycles in Fig. and charge-discharge time decreases slightly during cycling, where a small yet gradual decrease of capacitance can be seen and the energy efficiency remains at the level of 91% (Fig. ). This decrease could be due to the interactions on the electrode surface where faradaic reactions occur, and these reversible reactions might be affected by electrolyte depletion or structural changes in the electrode over longer cycling periods (see below). Nevertheless, the symmetric charge/discharge curve after 10000 cycles and nearly constant capacitance of 26 F/g (per total mass of electrodes) Since the pseudocapacitive faradaic processes are dependent on the short pathways for the Li-ion movement, any contaminant in the electrode acting as a parasitic reaction site could drive minor potential and capacity loss . On the other hand, the activated carbon electrode, which is a highly porous electrode, stores charges physically at the EDL, and a constant potential during the open circuit indicates nearly no involvement of parasitic reactions. Furthermore, the LIC was tested via galvanostatic charge/discharge at high current from 2.5 mA/g up to 100 mA/g by the gradual increase of specific current while keeping the cell voltage from 2.2-3.2 V.