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Influence of the alkali metal salt on the properties of solid electrolytes derived from a Lewis acidic polyether

Pennarun, Pierre-Yves LU and Jannasch, Patric LU (2005) In Solid State Ionics 176(23-24). p.1849-1859
Abstract
A polyether containing Lewis acidic boron atoms in its branched chain architecture was synthesised by a condensation reaction of boron trioxide, triethylene glycol monomethyl ether and poly(ethylene glycol), the latter having a molecular weight of 300 g/mol. Electrolytes based on this polymer and several different alkali metal salts were prepared and investigated. The state of the ions in the electrolytes was studied by FTIR spectroscopy, which detected the presence of ion pairs in electrolytes containing lithium triflate and lithium bis(trifluoromethane)sulfonimide (LiTFSI) salt. By thermogravimetry, all the electrolytes except those containing LiCl were found to be stable up to at least 150 degrees C. In general, an increased "hardness"... (More)
A polyether containing Lewis acidic boron atoms in its branched chain architecture was synthesised by a condensation reaction of boron trioxide, triethylene glycol monomethyl ether and poly(ethylene glycol), the latter having a molecular weight of 300 g/mol. Electrolytes based on this polymer and several different alkali metal salts were prepared and investigated. The state of the ions in the electrolytes was studied by FTIR spectroscopy, which detected the presence of ion pairs in electrolytes containing lithium triflate and lithium bis(trifluoromethane)sulfonimide (LiTFSI) salt. By thermogravimetry, all the electrolytes except those containing LiCl were found to be stable up to at least 150 degrees C. In general, an increased "hardness" of the basic anion gave rise to a decrease in the thermal stability. The reason behind this was thought to be an increasing destabilisation of the Lewis acidic boronate esters by interactions with the anions. The ionic conductivity of the electrolytes followed Vogel - Tammann - Fulcher (VTF) relationships, and was consistently found to increase with a decreased "hardness" of the basic anion. Consequently, the lowest conductivity at 30 degrees C for electrolytes with a salt concentration corresponding to [EO]: [Li] similar to 46 : 1 was measured for LiCl, 4 x 10(-6) S/cm, while the corresponding highest conductivity, 8 x 10(-5) S/cm, was recorded for the LiTFSI electrolyte. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Solid State Ionics
volume
176
issue
23-24
pages
1849 - 1859
publisher
Elsevier
external identifiers
  • wos:000231788000006
  • scopus:23444435993
ISSN
0167-2738
DOI
10.1016/j.ssi.2005.05.014
language
English
LU publication?
yes
id
77126093-4684-44d6-8374-e9454a1d2b84 (old id 153076)
date added to LUP
2007-07-13 15:33:16
date last changed
2017-11-05 03:44:30
@article{77126093-4684-44d6-8374-e9454a1d2b84,
  abstract     = {A polyether containing Lewis acidic boron atoms in its branched chain architecture was synthesised by a condensation reaction of boron trioxide, triethylene glycol monomethyl ether and poly(ethylene glycol), the latter having a molecular weight of 300 g/mol. Electrolytes based on this polymer and several different alkali metal salts were prepared and investigated. The state of the ions in the electrolytes was studied by FTIR spectroscopy, which detected the presence of ion pairs in electrolytes containing lithium triflate and lithium bis(trifluoromethane)sulfonimide (LiTFSI) salt. By thermogravimetry, all the electrolytes except those containing LiCl were found to be stable up to at least 150 degrees C. In general, an increased "hardness" of the basic anion gave rise to a decrease in the thermal stability. The reason behind this was thought to be an increasing destabilisation of the Lewis acidic boronate esters by interactions with the anions. The ionic conductivity of the electrolytes followed Vogel - Tammann - Fulcher (VTF) relationships, and was consistently found to increase with a decreased "hardness" of the basic anion. Consequently, the lowest conductivity at 30 degrees C for electrolytes with a salt concentration corresponding to [EO]: [Li] similar to 46 : 1 was measured for LiCl, 4 x 10(-6) S/cm, while the corresponding highest conductivity, 8 x 10(-5) S/cm, was recorded for the LiTFSI electrolyte.},
  author       = {Pennarun, Pierre-Yves and Jannasch, Patric},
  issn         = {0167-2738},
  language     = {eng},
  number       = {23-24},
  pages        = {1849--1859},
  publisher    = {Elsevier},
  series       = {Solid State Ionics},
  title        = {Influence of the alkali metal salt on the properties of solid electrolytes derived from a Lewis acidic polyether},
  url          = {http://dx.doi.org/10.1016/j.ssi.2005.05.014},
  volume       = {176},
  year         = {2005},
}