Physical properties of high Li-ion content N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide based ionic liquid electrolytes

Hyun Gook Yoon, Adam Samuel Best, Maria Forsyth, Douglas Robert Macfarlane, Patrick Craig Howlett

Research output: Contribution to journalArticleResearchpeer-review

110 Citations (Scopus)


Electrolytes based on bis(fluorosulfonyl) imide (FSI) with a range of LiFSI salt concentrations were characterized using physical property measurements, as well as NMR, FT-IR and Raman spectroscopy. Different from the behavior at lower concentrations, the FSI electrolyte containing 1:1 salt to IL mole ratio showed less deviation from the KCl line in the Walden plot, suggesting greater ionic dissociation. Diffusion measurements show higher mobility of lithium ions compared to the other ions, which suggests that the partial conductivity of Li+ is higher at this higher composition. Changes in the FT-IR and Raman peaks indicate that the cis-FSI conformation is preferred with increasing Li salt concentration.
Original languageEnglish
Pages (from-to)4656 - 4663
Number of pages8
JournalPhysical Chemistry Chemical Physics
Issue number6
Publication statusPublished - 2015

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