This was determined to be 3.266076•10 -3 m 2 and 4.151297•10 -3 m 2 for the positive and negative electrode respectively. The Nyquist plot for the positive electrode only shows one semi-circle that can be attributed to the charge transfer process. This is because the SEI resistance shares a similar time constant with the double layer and therefore is difficult to visually discern the phenomena (see Figure ). However, two RC elements should be included in the equivalent circuit model to account for the charge transfer and SEI resistance.