Li transference number (tLi+) of the SPE8:1:1 was measured using a Li|Li symmetric cell at 70 °C. Figure displays the current profile following a 10 mV polarization and the insert shows the impedances of the initial state and steady state. The tLi+ of SPE8:1:1 was calculated to be 0.2 which is consistent with the typical PEO system and the HCIL electrolyte. Ionic conduction in PEO-based SPEs is attributed to the chain segmental motion, where Li + ions coordinates with the ether oxygen on PEO backbone, leading to Li dissociation. However, Li + movements are restricted by the strong Li + -EO coordination, which results in relatively low ionic conductivity and low tLi+ (around 0.2 -0.3). Thereby, the transference number achieved by the SPE8:1:1 falls within the well-accepted region supporting the previous literature reports.