File(s) under permanent embargo

Undoing lithium ion association in ionic liquids through the complexation by oligoethers

journal contribution
posted on 09.12.2010, 00:00 authored by Paul Bayley, G Lane, L Lyons, D MacFarlane, Maria ForsythMaria Forsyth
Tetraglyme (TG) and the recently developed trimethylsilyl capped analogue (1NM3) when used as additives in a N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl) amide [C3mpyr][NTf2]/0.65 M LiNTf2 electrolyte have been shown to dramatically enhance the transport properties of this electrolyte. In fact, at a concentration of 20 mol % tetraglyme (leading to a ratio of ~1:1 ether molecule per lithium ion), viscosity, conductivity, and the diffusion coefficients of the C3mpyr+ and NTf2 are practically reinstated to the values observed in the absence of lithium, thereby negating the structuring effects of the lithium ion. The 7Li T1 relaxation times also indicate that these additives strongly interact with the lithium ions. Furthermore, although TG has twice the viscosity of 1NM3, the greatest improvement in transport properties was observed for TG.

History

Journal

Journal of physical chemistry C

Volume

114

Issue

48

Pagination

20569 - 20576

Publisher

American chemical society

Location

Washington, D.C.

ISSN

1520-6106

eISSN

1520-5207

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2010, American Chemical Society