Electrochemical Impedance Spectroscopy (EIS)

Nyquist Plots

A Nyquist Plot is a common way to represent EIS data, where impedance is plotted as a complex number on a graph with real and imaginary components. Each point corresponds to a frequency in Hz [where 1 Hz = 1/s]. The points to the left are at high frequency (smaller times) and as you move to the right you go to smaller frequencies (longer times). This allows us to analyze the time dependent processes occurring in a battery.