Publication Date
2008
Document Type
Thesis
Committee Members
William Feld (Committee Member), David Grossie (Committee Member), Vladimir Katovic (Committee Chair)
Degree Name
Master of Science (MS)
Abstract
Ionic liquids are an attractive possibility for battery electrolytes. Five ionic liquids were synthesized using a 1-alkyl-3-methylimidazolium (XMI+) cation, where the alkyl group was ethyl, propyl, butyl, pentyl, or hexyl, and a bis(pentafluoroethyl-sulfonyl)imide (Beti-) anion. The absorption and desorption of water, conductivities, densities, viscosities, decomposition temperatures, and electrochemical properties were studied. These ionic liquids were found to absorb less water than previously studied ionic liquids with tetrafluoroborate (BF4-) and hexafluorophosphate (PF6-) anions. Their conductivities decreased with longer alkyl chains on the imidazolium cation and were lower than ionic liquids with BF4- as the anion. The densities of the ionic liquids decreased with increasing temperature and alkyl chain length. Viscosities decreased with increasing temperature but increased with increasing chain length. All of the ionic liquids were found to be thermally stable to nearly 400 °C. The potential windows increased with increasing chain length, from 4.2 V (EMIBeti) to 4.7 V (HMIBeti).
Page Count
105
Department or Program
Department of Chemistry
Year Degree Awarded
2008
Copyright
Copyright 2008, all rights reserved. This open access ETD is published by Wright State University and OhioLINK.
