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The effect of coordinating and non-coordinating additives on the transport properties in ionic liquid electrolytes for lithium batteries

journal contribution
posted on 01.01.2011, 00:00 authored by Paul Bayley, A Best, D MacFarlane, Maria ForsythMaria Forsyth
In the present study we expand our analysis of using two contrasting organic solvent additives (toluene and THF) in an ionic liquid (IL)/Li NTf 2 electrolyte. Multinuclear Pulsed-Field Gradient (PFG) NMR, spin-lattice (T1) relaxation times and conductivity measurements over a wide temperature range are discussed in terms of transport properties and structuring of the liquid. The conductivity of both additive samples is enhanced the most at low temperatures, with THF slightly more effective than toluene. Both the anion and lithium self-diffusivity are enhanced in the same order by the additives (THF > toluene) while that of the pyrrolidinium cation is marginally enhanced. 1H spin-lattice relaxation times indicate a reasonable degree of structuring and anisotropic motion within all of the samples and both 19F and 7Li highlight the effectiveness of THF at influencing the lithium coordination within these systems.

History

Journal

Physical chemistry chemical physics

Volume

13

Issue

10

Pagination

4632 - 4640

Publisher

Royal Society of Chemistry

Location

London, England

ISSN

1463-9076

eISSN

1463-9084

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2011, Owner Societies