The oversupply of solvent molecules and, thus, the presence of free G3 molecules assumed by the long end-to-end distances at small mole fractions of [Li][NTf 2 ] is quantified in Figure . As suggested by Ueno et al., the amount of free glyme should not exceed 20 % to be categorized as a potential SIL. This criterion is only fulfilled for mixtures with x([Li][NTf 2 ]) ≥ 1/3. For all other mixtures, the amount of G3 molecules involved in complexes with the cations is less than 80 % at all investigated temperatures.