The electrodes for the study of the tortuosity factor were assembled in symmetric cell configuration using 2032-coin cells assembled in a dry room with a H2O content lower than 15 ppms. For the assembly of the cells, a Celgard 2500 separator was used and a 10 mM TBAClO4 solution prepared in a 1:1 wt% mixture of EC: DMC, using 150 μL per coin cell was used as electrolyte. The electrolyte conductivity was experimentally determined by the EIS study of symmetric cells consisting of blocking stainless steel electrodes and a range of Celgard 2500 separator stacks (from 1 to 3) with known parameters as described by Landesfeind et al. The experimental electrolyte conductivity was between 2.4 x 10 -4 S/cm and 3.12 x 10 -4 S/cm at 25ºC, matching previous reports.