Effect of electrolyte resistance in porous anodes

A transmission-line treatment has been used to explain the variation of capacitance and dissipation factor of cylindrical porous-anode bodies as a function of frequency due to the distributed resistance of the electrolyte within the pores. A correction has been determined to account for the effect of the ends of the cylindrical body. An effective resistivity is determined from experimental results which is a function of rhe volume of either the solid or liquid electrolyte and is also a function of the proportion of closed pores. A packed-sphere model is used to indicate the effect of the mean metal-particle size. The theory is applied to experimental results on a tantalum electrolytic capacitor.