Composition effects in polyetherurethane-based solid polymer electrolytes

Ng, Simon T. C., Forsyth, Maria, MacFarlane, Douglas R., Garcia, Maria, Smith, Mark E. and Strange, John H. 1998, Composition effects in polyetherurethane-based solid polymer electrolytes, Polymer, vol. 39, no. 25, pp. 6261-6268, doi: 10.1016/S0032-3861(98)00153-0.

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Title Composition effects in polyetherurethane-based solid polymer electrolytes
Author(s) Ng, Simon T. C.
Forsyth, MariaORCID iD for Forsyth, Maria
MacFarlane, Douglas R.
Garcia, Maria
Smith, Mark E.
Strange, John H.
Journal name Polymer
Volume number 39
Issue number 25
Start page 6261
End page 6268
Publisher Elsevier Ltd.
Place of publication Oxford, England
Publication date 1998-12
ISSN 0032-3861
Keyword(s) solid polymer electrolyte
ionic conductivity
polyether network
Summary 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. 7Li T1 and T2 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 (as measured by d.m.t.a.).
Language eng
DOI 10.1016/S0032-3861(98)00153-0
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 ©1998, Elsevier Science Ltd.
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