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Ionic conductivity of polymer gels deriving from alkali metal ionic liquids and negatively charged polyelectrolytes

journal contribution
posted on 30.04.2004, 00:00 authored by W Ogihara, J Sun, Maria ForsythMaria Forsyth, D MacFarlane, M Yoshizawa, H Ohno
We have prepared polymer gel electrolytes with alkali metal ionic liquids (AMILs) that inherently contain alkali metal ions. The AMIL consisted of sulfate anion, imidazolium cation, and alkali metal cation. AMILs were mixed directly with poly(3-sulfopropyl acrylate) lithium salt or poly(2-acrylamido-2-methylpropanesulfonic acid) lithium salt to form polymer gels. The ionic conductivity of these gels decreased with increasing polymer fraction, as in general ionic liquid/polymer mixed systems. At low polymer concentrations, these gels displayed excellent ionic conductivity of 10−4 to 10−3 S cm−1 at room temperature. Gelation was found to cause little change in the 7Li diffusion coefficient of the ionic liquid, as measured by pulse-field-gradient NMR. These data strongly suggest that the lithium cation migrates in successive pathways provided by the ionic liquids.

History

Journal

Electrochimica acta

Volume

49

Issue

11

Pagination

1797 - 1801

Publisher

Elsevier Science Pub. Co.

Location

New York, N.Y.

ISSN

0013-4686

eISSN

1873-3859

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2004, Elsevier Ltd.