Transference number measurements on a hybrid polymer electrolyte

Abstract

Two methods were used to measure the transference number of a hybrid polymer electrolyte at different salt concentrations. The hybrid polymer electrolyte was based on a radiation induced cross-linked polyether network with propylene carbonate in an interpenetrating liquid phase and LiAsF 6 as electrolyte salt. One method for transference number measurements was based on the Hittorf method, which gave values ranging from 0.15 at 0.1 mole kg −1 to 0.31 at 2.1 mole kg −1. The other method was the DC-polarization method, which gave values from 0.31 at 0.1 mole kg −1 to 0.72 at 2.1 mole kg −1. The difference in the transference numbers between the two methods is explained by contribution from mobile ion-pairs.