Thermophysical Properties of Ionic Liquid–LiX Mixtures

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dc.contributor.advisor Michael Dickey, Committee Member en_US
dc.contributor.advisor Wesley A. Henderson, Committee Chair en_US
dc.contributor.advisor Saad Khan, Committee Member en_US Zhou, Qian en_US 2010-04-02T17:59:58Z 2010-04-02T17:59:58Z 2009-07-16 en_US
dc.identifier.other etd-07062009-150951 en_US
dc.description.abstract Ionic liquids (ILs) have attracted strong interest due to their high chemical, thermal and electrochemical stability; wide liquid range; high ionic conductivity and low volatility. The research objective of this project has been to explore the thermophysical properties of ILs and their mixtures with lithium salts (LiX). These mixtures may become the electrolyte materials essential for the success of safer, high-voltage next-generation lithium batteries targeted for plug-in hybrid electric vehicles (PHEVs) and/or electric vehicles (EVs). At present, there is only a limited amount of data available in the literature regarding the thermal stability and phase behavior of IL-LiX electrolytes. Such information, however, is crucial for determining the electrolyte safety characteristics and useful operating temperature range, as well as for clarifying the composition-temperature relationship for other properties such as ionic conductivity. The thermal phase behavior, thermal stability and other properties (viscosity and density) are reported here for the neat ILs containing 1-alkyl-3-methylimidazolium (IM10R+, R = 1, 2 and 4 for methyl, ethyl and butyl, respectively) or N-alkyl-N-methylpyrrolidinium (PY1R+, R = 3-5) cations with TFSI- or FSI- anions, as well as their mixtures with LiTFSI or LiFSI salts. Three components electrolytes (1-x) PY14TFSI-(x) PY13FSI-LiX mixtures (X = TFSI- and PF6-) have also been examined. Such electrolytes show great promise for meeting the strick demands in properties necessary to achieve the superb Li battery performance and longevity required for the successful widespread use of PHEVs and/or EVs. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject Ionic Liquid; Li salt; thermophysical properties en_US
dc.title Thermophysical Properties of Ionic Liquid–LiX Mixtures en_US MS en_US thesis en_US Chemical Engineering en_US

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