WFRF:(Croce F.)
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- Pitawala, Jagath,1976Chalmers tekniska högskola,Chalmers University of Technology (författare)
Phase behaviour, transport properties, and interactions in Li-salt doped ionic liquids
- Artikel/kapitelEngelska2012
Förlag, utgivningsår, omfång ...
- 2012
- Royal Society of Chemistry (RSC),2012
Nummerbeteckningar
- LIBRIS-ID:oai:research.chalmers.se:53e6d1bd-3da2-496d-84fd-9df27e2b0c3a
- https://research.chalmers.se/publication/151771URI
- https://doi.org/10.1039/c1fd00056jDOI
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- Språk:engelska
- Sammanfattning på:engelska
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- SwePubSwePub
Klassifikation
Anmärkningar
- We report on the influence of lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) doping on the glass transition temperature (T(g)), the ionic conductivity, and Li-ion coordination of two dicationic ionic liquids (DILs) based on the TFSI anion. The results are compared to the behaviour of traditional mono-cationic ionic liquids. The cations of the DILs contain two imidazolium rings, connected by a decane hydrocarbon chain. Homogeneous mixtures of these ILs and LiTFSI can be obtained in a large concentration range. With increasing Li-salt concentration the ionic conductivity decreases whereas the glass transition temperature increases in both systems. However, the influence of the salt doping on the ionic conductivity and the glass transition temperature is low compared to typical mono-cationic ionic liquids, based on for example the pyrrolidinium cation and the TFSI anion. This behaviour is mirrored in the average coordination number of TFSI anions around Li-ions, determined by Raman spectroscopy. The coordination number is systematically lower in the DILs, suggesting a connection between the difference in the Li-ion environment and the behaviour of the glass transition and the ionic conductivity. A T(g)-scaled Arrhenius plot of the ionic conductivity shows that the ionic conductivity for all LiTFSI concentrations has the same temperature dependence, i.e. the fragility of the liquid is the same. This implies that the conduction process is dominated by the viscous properties of the liquids over the entire concentration range. This provides further support for linking the local environment of the Li-ions to the glass transition and conduction process in the ionic liquid/salt mixtures.
Ämnesord och genrebeteckningar
- TEKNIK OCH TEKNOLOGIER Materialteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Materials Engineering hsv//eng
- raman-spectroscopy
- anion
- electrolytes
- cation
- solvation
- tfsi
- conduction
- physicochemical properties
- lithium
- batteries
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Kim, Jae-Kwang,1978Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jaekwang (författare)
- Jacobsson, Per,1958Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)pjacob (författare)
- Koch, V.Covalent Associates, Inc. (författare)
- Croce, F.Universita degli Studi Gabriele d'annunzio di Chieti-Pescara,G. d'Annunzio University of Chieti-Pescara (författare)
- Matic, Aleksandar,1968Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)matic (författare)
- Chalmers tekniska högskolaCovalent Associates, Inc. (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Faraday Discussions: Royal Society of Chemistry (RSC)154, s. 71-801359-66401364-5498
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