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Ionic liquids and organic ionic plastic crystals utilizing small phosphonium cations

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journal contribution
posted on 01.01.2011, 00:00 authored by V Armel, D Velayutham, J Sun, Patrick HowlettPatrick Howlett, Maria ForsythMaria Forsyth, D MacFarlane, Jenny PringleJenny Pringle
The development of new liquid and solid state electrolytes is paramount for the advancement of electrochemical devices such as lithium batteries and solar cells. Ionic liquids have shown great promise in both these applications. Here we demonstrate the use of phosphonium cations with small alkyl chain substituents, in combination with a range of different anions, to produce a variety of new halide free ionic liquids that are fluid, conductive and with sufficient thermal stability for a range of electrochemical applications. Walden plot analysis of the new phosphonium ionic liquids shows that these can be classed as "good" ionic liquids, with low degrees of ion pairing and/or aggregation, and the lithium deposition and stripping from one of these ionic liquids has been demonstrated. Furthermore, for the first time phosphonium cations have been used to form a range of organic ionic plastic crystals. These materials can show significant ionic conductivity in the solid state and thus are of great interest as potential solid-state electrolyte materials.

History

Journal

Journal of materials chemistry

Volume

21

Issue

21

Pagination

7640 - 7650

Publisher

Royal Society of Chemistry

Location

London, England

ISSN

0959-9428

eISSN

1364-5501

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2011, The Royal Society of Chemistry