Fig. 1. FE-SEM images from the pristine composite electrodes with a) VGCF, b ) VGCF/Super-P (2:1), c ) VGCF/Super-P (1:2), and d) Super-P. e), f), g), h) The magnified SEM images of the VGCF, VGCF/Super-P (2:1), VGCF/Super-P (1:2) and Super-P electrodes.
Fig. 2. Electronic conductivities from pellets having SiO, graphite and conducting agents by a 4-probe method under various pressures from 200 to 600 kgf cm-2.
Fig. 3. GITT voltage curves from the cells having various conducting agents.
Fig. 4. the 1st voltage curves a) in the potential range from 5 mV to 2 V and b) with the limitation of 450 mAh g-1·c) Coulombic efficiencies by using a higher charge capacity than 450 mAh g-1 by combination with a) and b).
Fig. 5. Cycleability with the cells having VGCF, VGCF/Super-P (2:1), VGCF/Super-P (1:2), and Super-P. The current density was 0.5 C for discharge and 0.2 C for charge (1C = 450 mA g-1). Filled and blank circles represent for discharge and charge capacity, respectively.
Fig. 6. Discharge voltage curve from cells having various conducting agent systems: a) VGCF, b) VGCF:Super-P (2:1), c) Super-P.
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