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Inhibition of self-aggregation in ionic liquid electrolytes for high-energy electrochemical devices

TitoloInhibition of self-aggregation in ionic liquid electrolytes for high-energy electrochemical devices
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2011
AutoriKunze, M., Paillard E., Jeong S., Appetecchi Giovanni Battista, Schoönhoff M., Winter M., and Passerini S.
RivistaJournal of Physical Chemistry C
Volume115
Paginazione19431-19436
ISSN19327447
Parole chiaveAggregation behavior, Bis(trifluoromethane sulfonyl)imide, Electrochemical devices, Electrochemical storage, Electrolytic capacitors, Ether group, Ethers, High energy, High energy physics, Ion Mobility, Ionic liquid electrolytes, Ionic liquids, Lithium, Lithium cations, Negative ions, Nuclear magnetic resonance, organic compounds, Positive ions, Pyrrolidinium cations, Raman methods, Raman spectroscopy, Self aggregation, Side-chains, Spin dynamics, Spin lattices, Spin-spin relaxation, Super capacitor, Surface active agents, Virtual storage
Abstract

Some ionic liquids (ILs) based on pyrrolidinium cations, which are of interest for high-energy electrochemical storage devices, such as lithium batteries and supercapacitors, have a structure similar to that of surfactants and tend to form local aggregates. The investigated ILs consist of the bis(trifluoromethanesulfonyl)imide (TFSI) anion and pyrrolidinium-based cations having a methyl side chain and an ether (ethylmethoxy- or ethylethoxy-) side chain. For such, it is very important to understand if these IL cations tend to aggregate like surfactants because this would affect the ion mobility and thus the ionic conductivity. The aggregation behavior of these ILs was extensively studied with NMR and Raman methods also in the presence of Li+ cations and compared with that of corresponding ILs having no ether group on the cation side chain. 2H NMR spin-lattice and spin-spin relaxation rates were analyzed by applying the "two step" model of surfactant dynamics. Here we show that whereas the ILs based on pyrrolidinium cations without ether functions tend to form aggregates in which the cations are surrounded by the anions, especially in the presence of lithium cations, those with an ether side chain are not aggregated. © 2011 American Chemical Society.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-80053513899&doi=10.1021%2fjp2055969&partnerID=40&md5=8c4acffa6cc0dbb6dd48f7b503ecfc06
DOI10.1021/jp2055969
Citation KeyKunze201119431