Determination of Electrolyte Transport Properties with a Multi-Reference-Electrode Cell

Fast charging is one of the main challenges electric vehicles, partly due to electrolyte transport limitations across porous electrodes in Li-ion cells. The determination properties crucial for modeling fast and adjust cell design accordingly. In this work, diffusion coefficient cation transference number a 1 M LiPF 6 ethylene carbonate/diethyl carbonate mixture (1:1 weight) are determined using multireference electrode electrochemical (four herein). It an extension work by Farkhondeh et al. [J. Phys. Chem. C 2017, 121, 8, 4112–4129] that was based on two reference electrodes. Long galvanostatic pulses allow building up concentration gradients (restricted diffusion), which subsequently let relax under open circuit. multiple voltages (three herein) measured between four simultaneously analyzed with different procedures involve combination analytic methods nonlinear regression data numerical model. parameter mean values 95%-confidence intervals evaluated Student t -distribution bootstrap method. Values reported combining all together are: D = 2.62 × 10 ? width=".5em" ± width=".25em" 2.29 % m 2 mathvariant="normal">s 1 , ${t}_{+}^{0}=\,0.204\,\left[\pm 12.25\, \right]$?> t + 0 0.204 12.25 at 25 °C.