Universal equivalent circuit of electrochemical cell

A detailed analysis of the mathematical model of a random-structure RC two-terminal network is performed. It is shown that a circuit of any RC two-terminal network can be reduced to a universal form consisting of a set of parallel branches. Each branch corresponds to a single relaxation process and represents a circuit of serially connected resistance and capacitor. The equivalent circuit under consideration is a compact representation of experimental data obtained using the impedance spectroscopy method. It is recommended to use the universal circuit as an intermediate model of an electrochemical cell.