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Page 4 of 14 Alvarez-Tirado et al. Energy Mater 2023;3:300003 https://dx.doi.org/10.20517/energymater.2022.59
Figure 1. Chemical structures of the ILs evaluated in this work. ILs: Ionic liquids.
Scheme 1. Schematic of UV-photopolymerisation process to obtain crosslinked iongel electrolytes.
and/or functional groups . The additional fluorinated moieties of DEME-BETI, DEME-C F SO and
[8]
3
3 9
FD-TFSI increased the ion sizes, leading to an increase in viscosity. Interestingly, DEME-BETI and FD-TFSI
had similar F/O ratio (~2), but the viscosity of DEME-BETI at room temperature was double (319
compared to 144 mPa·s, respectively), suggesting that FD-TFSI has ions with weaker interaction forces,
leading to smaller energies being required for molecular motion.
Scheme 1 shows the simple UV-photopolymerisation method followed to obtain iongels with very high
[16]
liquid electrolyte contents (up to 90 wt.%) . Poly(ethylene glycol) dimethacrylate (PEGDM) was directly
mixed with the ionic liquid electrolyte (ILE) in the presence of a radical photoinitiator (2-hydroxy-2-
