Question 1: Electrochemical Impedance Spectroscopy (40 points) a) Consider a Cu/Li conducting electrolyte/Cu symmetric cell. The two electrodes are identical. Draw the equivalent circuit of the full cell. Draw the Nyquist plot and the bode plot of the full cell based on following parameters. Electrode size: 10 cm". Electrolyte resistance is 10 ohm. Double layer capacitance is 10 ?F/cm". Choose frequency range of 10 kHz to 100 Hz. Determine the characteristic frequency corresponding to |Z'| = |Z"|, where Z' and Z" are the real and the imaginary part of the complex impedance, respectively. b) Now let us consider a Li/electrolyte interface. The electrode size is 10 cm", the exchange current density is 1 × 10?³ A/cm" (n=1), and the double layer capacitance is 10 ?F/cm". Draw the corresponding Nyquist plot. What is the characteristic frequency of the semicircle?
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The resistors represent the electrolyte resistance and the capacitors represent the double layer capacitance. The two branches are connected in series, representing the two identical electrodes. The Nyquist plot is a semicircle with a radius equal to the Show more…
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