Impedance Spectroscopic Studies of the Porous Structure of Electrodes containing Graphite Materials with Different Particle Size and Shape

These findings suggest a correlation of the equivalent distributed resistance with the tortuosity of the graphite electrodes. In the case of flaky graphite materials the equivalent distributed resistance increases dramatically with the increase in electrode compaction causing a high tortuosity of the electrode. In the case of bulky or round-shaped graphite materials the equivalent distributed resistance is not much affected by the densification of the electrode which could be explained by smaller electrode tortuosity even at higher electrode density.