Evaluating Allyl and Vinyl-Modified Boronium Ionic Liquids for Energy Storage Applications

This work investigates two polymerizable boronium ionic liquids (BILs) that were identified as candidates for solid or pseudo-solid electrolytes in energy storage applications. The cation structures, [(1-v-imid)N 111 BH 2 ] + and [(1-a-pyrr)N 111 BH 2 ] + , were chosen to bolster high performing BILs from past studies with polymerizable functionality capable of producing solid or pseudo-solid state electrolytes. The second cation ([(1-a-pyrr)N 111 BH 2 ] + ) has not yet been reported in the literature. Ultimately, two polyBILs with the bis(trifluoromethanesulfonyl)imide anion were prepared and characterized using a suite of characterization techniques including nuclear magnetic resonance spectroscopy, X-ray diffractometry, thermal gravimetric analysis, differential scanning calorimetry, cyclic voltammetry, and electrochemical impedance spectroscopy.