This work describes the effect of the number of roll pressings and the composition of carbon black on the electrical and mechanical properties of carbon–PTFE electrodes, in which the composition is MSP 20:carbon black:PTFE=95− x:x:5wt.%. It was found that the best electrical and mechanical properties were obtained in sheet electrodes roll-pressed for about 15 times and in sheet electrode, in which composition is MSP 20:carbon black:PTFE=80:15:5wt.%. These results can be explained by the network structure of PTFE fibrils and conducting paths linked with carbon blacks, respectively. On the other hand, a cell capacitor using a sheet electrode with 15wt.% of carbon black attached to an aluminum current collector with an electric conductive adhesive, and a composition of carbon black:CMC=70:30wt.%, exhibited the best rate capability in the current range of 0.5–100mAcm−2 and the lowest equivalent series resistance.