Acid-base titration of the resulting solutions was carried out using a Thermo Scientific Orion DUAL (1) STAR pH meter at 25 o C to determine the free acid and free base concentrations in the anolyte and catholyte, respectively, with 0.5 M NaOH or 0.5 M HCl, from which recovered H2SO4 or produced NaOH were indirectly quantified. Dynamic Mechanical Analysis (DMA) was performed using a TA Instruments DMA Q800. Scans were conducted from 0.01 to 25 Hz at 25 °C. Photopolymerised lithium-conductive membranes based on LiMTFSI or LiSTFSI and IBMA were cut in a rectangular shape of 2 cm x 1 cm for the measurement. Differential Scanning Calorimetry (DSC) measurements were performed using a DSC Q2000 instrument from TA Instruments. The DSC scans were performed at heating and cooling rates of 10 °C min -1 from -70 °C to 150 °C. Between 5 to 10 mg of each LiTFSI-based membrane were employed for the measurements. The glass transition temperature (Tg) was determined for the second heating cycle employing the middle temperature.