Figure 7. (a) Effective series resistance (ESR) of full cells subjected
to the cycling protocol
shown in Figure 6a as a function of float time. (b)
Capacitance of
full cells subjected to the
cycling protocol shown in Figure 6a as a function of float time. Capacitance is normalized to F/g
of carbon for each individual electrode. Both specific capacitance and
ESR are derived from EIS
of fully discharged cells (0 V cell voltage).
22
Figure 8. Voltage profiles for a full cell (two-electrode button cell) with 1 m NaPF
6
/DME
electrolyte cycled at 1 mA/cm
2
between 0 and 3.5 V. The capacity is normalized
to the total mass
of carbon in the capacitor including both positive and negative electrodes.
23
Figure 9. Cycling stability of a full cell (two-electrode button cell) with 1 m NaPF
6
/DME
electrolyte cycled at 1 mA/cm
2
between 0 and 3.5 V. (a)
Specific
capacitance and ESR as a
function of cycle number calculated from EIS collected after every 100 cycles.
EIS was collected
on fully discharged cells (0 V cell voltage). Capacitance is normalized to F/g of carbon for each
individual electrode. (b) Coulombic efficiency as a function of cycle number.
