Enhancement of ion dissociation in polyelectrolyte gels

Forsyth, M., Sun, J., Zhou, F. and MacFarlane, D. R. 2003, Enhancement of ion dissociation in polyelectrolyte gels, Electrochimica acta, vol. 48, no. 14-16, pp. 2129-2136.

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Title Enhancement of ion dissociation in polyelectrolyte gels
Author(s) Forsyth, M.
Sun, J.
Zhou, F.
MacFarlane, D. R.
Journal name Electrochimica acta
Volume number 48
Issue number 14-16
Start page 2129
End page 2136
Publisher Elsevier Science Pub. Co.
Place of publication New York, N.Y.
Publication date 2003-06-30
ISSN 0013-4686
1873-3859
Keyword(s) ion dissociation
polymer electrolytes
gels
conductivity
NMR
lithium ion
Summary High conductivity in single ion conducting polymer electrolytes is still the ultimate aim for many electrochemical devices such as secondary lithium batteries. Achieving effective ion dissociation in these cases remains a challenge since the active ion tends to remain in close proximity to the backbone charge as a result of a low degree of ion dissociation. A unique aspect of this dissociation problem in polyelectrolytes is the repulsion between the backbone charges created by dissociation. One way of enhancing ion dissociation in polyelectrolyte systems is to use copolymers in which only a fraction (<20%) of the mer units are charged and where the comonomer is itself chosen to be polar and preferably to be compatible with potential solvents. We have also found that certain dissociation enhancers based on ionic liquids or boroxine ring compounds can lead to high ionic conductivity. In the cases where an ionic liquid is used as the solvent in a polyelectrolyte gel, the viscosity of the ionic liquid and its hydrophilicity are critical to achieving high conductivity. Compounds based on the dicyanamide anion appear to be very effective ionic solvents; polyelectrolyte gels incorporating such ionic liquids exhibit conductivities as high as 10−2 S/cm at room temperature. In the case of boroxine ring dissociation enhancers, gels based on poly(lithium-2-acrylamido-2-methyl-1-propanesulfonate) and ethylene carbonate produce conductivities approaching 10−3 S/cm. This paper will discuss these approaches for achieving higher conductivity in polyelectrolyte materials and suggest future directions to ensure single ion transport.
Language eng
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, Elsevier Science Ltd
Persistent URL http://hdl.handle.net/10536/DRO/DU:30030146

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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