EGDMA membrane and the Nafion TM 117 membrane as benchmark was evaluated by performing analogous electrodialysis experiments using 3 M Na2SO4 as the anolyte and 0.5 M NaOH as the catholyte (replacing the Li2SO4 and LiOH solutions) to analyse the Na-ion transport dynamics of membrane. The results are summarised in Table . The LiMTFSI-based membrane presented a Li + /Na + selectivity of 0.98 (based on the molar fluxes ratios), which was higher than the Nafion TM 117 membrane selectivity of 0.88. This shows the beneficial effect of having the more Li-selective LiTFSI functional groups, in comparison with the sulfonic acid groups present in the Nafion TM membrane.