However, lowering the LiTFSI:IBMA ratio produced more brittle and fragile polymeric membranes, with fewer LiTFSI functional groups available for Li-ion transport. The three polymer compositions that were considered suitable for ED and were therefore selected for the next characterisation studies were P(LiMTFSI-IBMA)-2.5% EGDMA, P(LiMTFSI-IBMA)-10% EGDMA and P(LiSTFSI-IBMA)-10% EGDMA. Thermal characterisation of the selected polymeric CEMs was carried out using DSC to confirm the presence of a glass transition Tg and to identify the effect of the crosslinker composition in the CEMs.