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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Langwald, Norbert
in Cooperation with on an Cooperation-Score of 37%
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Publications (3/3 displayed)
- 2015Synthesis and characterization of lithium-salt complexes with difluoroalkoxyborates for application as lithium electrolytescitations
- 2014Lithium electrolytes based on modified imidazolium ionic liquidscitations
- 2011Synthesis and characterization of new trifluoroalkoxyborates lithium salts of ionic liquid propertiescitations
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article
Lithium electrolytes based on modified imidazolium ionic liquids
Abstract
In this study, new electrolytes for Li-ion batteries in the form of lithium salt solutions in room temperature imidazolium ionic liquids (RTIL) are reported. The ionic liquids applied, for higher reduction potential stability, were substituted at position C2 with oligooxyethylene groups of various length ([Im nEO]þX; where: n ¼ 0, 3, 7, 20 and X ¼ Cl, BF4, N(CF3SO2)2). It was found that they are good solvents for lithium salts (LiBF4, LiN(CF3SO2)2, {[CH3(OCH2CH2)3O]3BC4H9}Li) forming liquid solutions of low glass transition temperature (Tg in the 70 to 40 C range). Ionic conductivity depends on the length of oxyethylene substituent in Im nEO and on the concentration of the salt applied, for 10 mol%, sRT is of the order of 104 S cm1. On the basis of polarization measurements by the variable-current method, the proportion of lithium cations in electric charge transfer (tþ) has been determined. The values obtained (typical for ionic liquids) are low and depend on n and lithium salt concentration but do not exceed a dozen or so percent.