The fundamental feature of BV kinetics is that the current versus overpotential relationship is linear at small overpotentials but becomes exponential at large overpotentials. EIS measurements are advantageous because they are quick, non-destructive, and can deconvolute Rct from other sources of resistance in the cell . However, when EIS measurements are conducted within the linear region of BV kinetics (i.e., at low overpotentials), it is impossible to directly measure the value of α or I0, because infinitely many combinations of α and I0 can yield the same Rct value.