Studies of ionic liquids in lithium-ion battery test systems

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In this work, thermal and electrochemical properties of neat and mixed ionic liquid - lithium salt systems have been studied. The presence of a lithium salt causes both thermal and phase-behavior changes. Differential scanning calorimeter DSC and thermal gravimetric analysis TGA were used for thermal analysis for several imidazolium bis(trifluoromethylsulfonyl)imide, trifluoromethansulfonate, BF{sub 4}, and PF{sub 6} systems. Conductivities and diffusion coefficient have been measured for some selected systems. Chemical reactions in electrode - ionic liquid electrolyte interfaces were studied by interfacial impedance measurements. Lithium-lithium and lithium-carbon cells were studied at open circuit and a charged system. The ionic liquids studied ... continued below

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Salminen, Justin; Prausnitz, John M. & Newman, John June 1, 2006.

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In this work, thermal and electrochemical properties of neat and mixed ionic liquid - lithium salt systems have been studied. The presence of a lithium salt causes both thermal and phase-behavior changes. Differential scanning calorimeter DSC and thermal gravimetric analysis TGA were used for thermal analysis for several imidazolium bis(trifluoromethylsulfonyl)imide, trifluoromethansulfonate, BF{sub 4}, and PF{sub 6} systems. Conductivities and diffusion coefficient have been measured for some selected systems. Chemical reactions in electrode - ionic liquid electrolyte interfaces were studied by interfacial impedance measurements. Lithium-lithium and lithium-carbon cells were studied at open circuit and a charged system. The ionic liquids studied include various imidazolium systems that are already known to be electrochemically unstable in the presence of lithium metal. In this work the development of interfacial resistance is shown in a Li|BMIMBF{sub 4} + LiBF{sub 4}|Li cell as well as results from some cycling experiments. As the ionic liquid reacts with the lithium electrode the interfacial resistance increases. The results show the magnitude of reactivity due to reduction of the ionic liquid electrolyte that eventually has a detrimental effect on battery performance.

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  • Journal Name: ECS Transactions; Journal Volume: 1; Journal Issue: 26; Related Information: Journal Publication Date: 2006

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  • Report No.: LBNL--60630
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 908175
  • Archival Resource Key: ark:/67531/metadc889658

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  • June 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 29, 2016, 7:09 p.m.

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Salminen, Justin; Prausnitz, John M. & Newman, John. Studies of ionic liquids in lithium-ion battery test systems, article, June 1, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc889658/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.