File(s) under permanent embargo

Lithium polyelectrolyte–ionic liquid systems

journal contribution
posted on 01.04.2002, 00:00 authored by J Sun, D MacFarlane, Maria ForsythMaria Forsyth
Novel lithium polyelectrolyte–ionic liquid systems, using poly(lithium 2-acrylamido-2-methyl propanesulfonate) and its copolymer with N-vinyl formamide, have been developed in this work. The ionic liquid used in this work is from a novel family of methanesulfonate ionic liquids, specifically N-hexyl-N,N,N-tributyl ammonium methanesulfonate, which is chosen because of the similarity with the anionic functionality of the polymer. The ionic liquid thereby acts as a good solvating medium for the polyelectrolyte. It was found that the copolymer-based polyelectrolyte–ionic liquid system exhibits two to three times higher conductivity than that of the homopolymer system. The results of solid-state 7Li-NMR have shown that lithium cations in the copolymer system are mobile whereas in the homopolymer, only a fraction appears to be mobile even at 80 °C. This supports the hypothesis that separation of the charged groups on the polymer backbone via the co-monomer encourages the dissociation of lithium cations from the sulfonate groups bonded to the polymer chains, and hence, results in an increase in conductivity of the polyelectrolyte material.

History

Journal

Solid state ionics

Volume

147

Issue

3-4

Pagination

333 - 339

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0167-2738

eISSN

1872-7689

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2002, Elsevier Science B.V.