To probe the characteristics of GdmTFSI in aqueous solutions, electrolytes were prepared up to the saturation limit of 8 mol/kg (m). The anion environment in solution can be uncovered through probing the IR region at 1000 -1250 cm -1 which corresponds to vibrations modes from TFSI -. The region at 700-850 cm -1 studied above for dry salt could not be examined in solution as the peaks are obscured by a broad water band. Fig. showcases that with increasing concentration, peaks for asymmetric CF3 and symmetric SNS (denoted aCF3 and sSNS) are shifted to lower wavenumbers, indicating the TFSI -environment changes with concentration.