Composition effects in polyetherurethane-based solid polymer electrolytes

Ng, Simon T.C. and Forsyth, Maria and MacFarlane, Douglas R. and Garcia, Maria and Smith, Mark E. and Strange, John H. (1998) Composition effects in polyetherurethane-based solid polymer electrolytes. Polymer, 39 (25). pp. 6261-6268. ISSN 0032-3861. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Nuclear magnetic resonance spectroscopy (n.m.r.), dynamic mechanical thermal analysis (d.m.t.a.) and AC impedance techniques have been used in combination to probe the effect of electrolyte composition in an archetypal solid polymer electrolyte (SPE). A series of solid polymer electrolytes (SPEs) based on a urethane-crosslinked trifunctional poly(ethylene glycol) polymer host containing dissolved ionic species (LiClO4 and LiCF3SO3) have been studied. D.m.t.a. has established that increasing LiClO4 concentration causes a decrease in the polymer segmental mobility, owing to the formation of transient crosslinks via cation-polymer interaction. Investigation of the distribution of mechanical/structural relaxation times for the LiClO4/polymer complex with d.m.t.a. reveals that increasing LiClO4 concentration causes a slight broadening of the distribution, indicating a more heterogeneous environment. Results of n.m.r. Li-7 T-1 and T-2 relaxation experiments support the idea that higher salt concentrations encourage ionic aggregation. This is of critical importance in determining the conductivity of the material since it affects the number of charge carriers available. Introduction of the plasticiser tetraglyme into the LiClO4-based SPEs suppresses the glass transition temperature of the SPE, and causes a significant broadening of the relaxation time distribution las measured by d.m.t.a.).

Item Type: Article
Uncontrolled keywords: solid polymer electrolyte; ionic conductivity; polyether network
Subjects: T Technology > TP Chemical technology
Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: M.A. Ziai
Date Deposited: 05 Apr 2009 17:32
Last Modified: 16 Jun 2014 15:14
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