Evaluation of ionic mobility and transference number in a polymeric solid electrolyte by isothermal transient ionic current method

Abstract

We proposed a new method for evaluating mobilities of both Li+ and SCN- ions in a polymeric solid electrolyte formed by poly (ethylene succinate) and LiSCN. The method is based on the isothermal transient ionic current (ITIC) technique by using an ion-blocking platinum electrode and an ion-reversible lithium electrode. The differences of the ITIC profiles, depending on the kind of the electrodes, provided both mobilities of Li + and SCN- ions, and their assignment. The mobilities of Li+ and SCN- ions at 90°C were 1.3-4.2×10 -6 cm2 V-1 s -1 and 5.3-10.7×10-8 cm 2 V-1 s-1, respectively. The transference number of Li+ ions was 0.92-0.99.