Abstract
Eight new polymerizable ammonium-TFSI ionic liquids were synthesized and characterized with respect to an application in energy storage devices. The ionic liquids feature methacrylate or acrylate termination as polymerizable groups. The preparation was optimized to obtain the precursors and ionic liquids in high yield. All products were characterized by NMR and IR spectroscopy. Phase transition temperatures were obtained by DSC analysis. Density, viscosity and ionic conductivity of the ionic liquids were compared and discussed. The results reveal that the length of attached alkyl groups as well as the methyl group at the polymerizable function have significant influences on the ionic liquids physicochemical properties. Ionic conductivity values vary between 0.264 mS cm−1 for [C2NA,22]TFSI and 0.080 mS cm−1 for [C8NMA,22]TFSI at 25 °C. Viscosity values are within a range of 0.762 Pa s for [C2NA,22]TFSI and 1.522 Pa s for [C6NMA,22]TFSI at 25 °C.
Highlights
Ionic liquids (ILs) possess a wide range of applications, being employed in CO2 adsorption [1], catalysis [2] or as solvents [3]
We have synthesized and characterized eight new ionic liquids to improve the understanding of how structural changes affect the physicochemical properties of ionic liquids
The study reveals that an increasing side chain length at the ammonium moiety as well as and methyl group at the acrylate function accompany with increasing viscosity and decreasing ionic conductivity values
Summary
Ionic liquids (ILs) possess a wide range of applications, being employed in CO2 adsorption [1], catalysis [2] or as solvents [3]. A common example is the reactions of the aluminum current collector with bis(trifluoromethanesulfonyl)imide (TFSI) containing ionic liquids [9] This type of degradation mechanism can be avoided if the electrolyte is fixed between the electrodes. For application in energy storage systems the relationship between structure variations and fundamental properties such as glass transition temperature, viscosity and ionic conductivity are of great interest. The characterization of the IL products is presented with conditions to achieve almost quantitative precursor yields even for steric demanding alkyl chains and respect to an application the ionic liquids in energy storage systems. Of monomeric ILs are analyzed and their adaptability on polymerized ionic liquids are discussed
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