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Characteristics of gel electrolytes formed by self-aggregating comb-shaped polyethers with end-functionalised side chains

Jannasch, Patric LU and Loyens, Wendy LU (2004) In Solid State Ionics 166(3-4). p.417-424
Abstract
Gel electrolytes based on comb-shaped polyethers have been prepared and characterised. The comb-shaped polyethers consisted of poly(ethylene oxide) (PEO) or poly(ethylene oxide-co-propylene oxide) (PEOPO) side chains tethered to styrenic backbone polymers. All the polyether side chains were terminated by hydrocarbon (C-16) chain ends. Polymer gel electrolytes were prepared by adding 10-70 wt.% of an electrolyte solution with 1 M lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) salt in gamma-butyrolactone (gamma-BL) or in a mixture of ethylene carbonate and diethyl carbonate (EC/DEC). Thermal analysis by differential scanning calorimetry (DSC) showed endotherms arising from the melting of hydrocarbon phase domains, indicating polymer... (More)
Gel electrolytes based on comb-shaped polyethers have been prepared and characterised. The comb-shaped polyethers consisted of poly(ethylene oxide) (PEO) or poly(ethylene oxide-co-propylene oxide) (PEOPO) side chains tethered to styrenic backbone polymers. All the polyether side chains were terminated by hydrocarbon (C-16) chain ends. Polymer gel electrolytes were prepared by adding 10-70 wt.% of an electrolyte solution with 1 M lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) salt in gamma-butyrolactone (gamma-BL) or in a mixture of ethylene carbonate and diethyl carbonate (EC/DEC). Thermal analysis by differential scanning calorimetry (DSC) showed endotherms arising from the melting of hydrocarbon phase domains, indicating polymer self-aggregation in the gels by microphase separation of the chain ends. As the concentration of electrolyte solution was increased, the melt temperature of the hydrocarbon phase domains was found to decrease, while the heat of fusion in joules per grain polyether remained essentially constant. The latter finding implied a strong propensity for the hydrocarbon chains to phase separate in the electrolytes. This was further supported by small-angle X-ray scattering measurements which showed a characteristic diffraction distance of approximately 60 A in the gels. The ion conductivity of the electrolytes with 70 wt.% of electrolyte solution added typically reached 10(-2.5) S/cm at 20degreesC. (C) 2004 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Self-associating graft copolymer, Hydrophobically modified poly(ethylene oxide), Polymer gel electrolyte, Crystallisation, Ionic conductivity
in
Solid State Ionics
volume
166
issue
3-4
pages
417 - 424
publisher
Elsevier
external identifiers
  • wos:000220611500021
  • scopus:1442309286
ISSN
0167-2738
DOI
10.1016/j.ssi.2003.11.008
language
English
LU publication?
yes
id
5a697d13-30a5-4f4e-9de5-1494da2f10f6 (old id 139533)
date added to LUP
2007-07-13 12:09:41
date last changed
2017-01-01 04:37:19
@article{5a697d13-30a5-4f4e-9de5-1494da2f10f6,
  abstract     = {Gel electrolytes based on comb-shaped polyethers have been prepared and characterised. The comb-shaped polyethers consisted of poly(ethylene oxide) (PEO) or poly(ethylene oxide-co-propylene oxide) (PEOPO) side chains tethered to styrenic backbone polymers. All the polyether side chains were terminated by hydrocarbon (C-16) chain ends. Polymer gel electrolytes were prepared by adding 10-70 wt.% of an electrolyte solution with 1 M lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) salt in gamma-butyrolactone (gamma-BL) or in a mixture of ethylene carbonate and diethyl carbonate (EC/DEC). Thermal analysis by differential scanning calorimetry (DSC) showed endotherms arising from the melting of hydrocarbon phase domains, indicating polymer self-aggregation in the gels by microphase separation of the chain ends. As the concentration of electrolyte solution was increased, the melt temperature of the hydrocarbon phase domains was found to decrease, while the heat of fusion in joules per grain polyether remained essentially constant. The latter finding implied a strong propensity for the hydrocarbon chains to phase separate in the electrolytes. This was further supported by small-angle X-ray scattering measurements which showed a characteristic diffraction distance of approximately 60 A in the gels. The ion conductivity of the electrolytes with 70 wt.% of electrolyte solution added typically reached 10(-2.5) S/cm at 20degreesC. (C) 2004 Elsevier B.V. All rights reserved.},
  author       = {Jannasch, Patric and Loyens, Wendy},
  issn         = {0167-2738},
  keyword      = {Self-associating graft copolymer,Hydrophobically modified poly(ethylene oxide),Polymer gel electrolyte,Crystallisation,Ionic conductivity},
  language     = {eng},
  number       = {3-4},
  pages        = {417--424},
  publisher    = {Elsevier},
  series       = {Solid State Ionics},
  title        = {Characteristics of gel electrolytes formed by self-aggregating comb-shaped polyethers with end-functionalised side chains},
  url          = {http://dx.doi.org/10.1016/j.ssi.2003.11.008},
  volume       = {166},
  year         = {2004},
}