528496.fig.004a
(a)
528496.fig.004b
(b)
Figure 4: I-V characteristics during the 1st cycle of electrochemical charging/discharging (a) and the cyclic stabilities of charging (closed data)/discharging (open data) test results for the 2nd to the 50th cycle (b) for various electrodes, such as conductive carbon blacks (●, ○), pitch carbon ( ), and + 30 wt% pitch carbon ( ) samples.