Advanced

Single lithium-ion conducting poly(tetrafluorostyrene sulfonate) – polyether block copolymer electrolytes

Shao, Zhecheng LU and Jannasch, Patric LU (2017) In Polymer Chemistry 8(4). p.785-794
Abstract
Solid single-ion conducting polymers continue to attract a significant interest as electrolyte materials with a great potential to improve safety and performance of energy storage devices. Still, their low conductivity is a significant hurdle presently preventing their application. Here, we report on highly conductive BAB triblock copolymers with A blocks of either poly(ethylene oxide) (PEO) or poly(ethylene oxide-co-propylene oxide) (PEOPO), and B blocks of poly(lithium 2,3,5,6-tetrafluorostyrene-4-sulfonate) (PPFSLi). The copolymers were conveniently synthesised by atom transfer radical polymerisation (ATRP) of 2,3,4,5,6-pentafluorostyrene from polyether macroinitiators, followed by quantitative thiolation using NaSH and... (More)
Solid single-ion conducting polymers continue to attract a significant interest as electrolyte materials with a great potential to improve safety and performance of energy storage devices. Still, their low conductivity is a significant hurdle presently preventing their application. Here, we report on highly conductive BAB triblock copolymers with A blocks of either poly(ethylene oxide) (PEO) or poly(ethylene oxide-co-propylene oxide) (PEOPO), and B blocks of poly(lithium 2,3,5,6-tetrafluorostyrene-4-sulfonate) (PPFSLi). The copolymers were conveniently synthesised by atom transfer radical polymerisation (ATRP) of 2,3,4,5,6-pentafluorostyrene from polyether macroinitiators, followed by quantitative thiolation using NaSH and subsequent oxidation to form the sulfonate anions. The copolymers possessed high thermal stability and their ionic content was conveniently controlled by the block ratio during the ATRP. Above the polyether melting point, a PEO-based block copolymers with [O]:[Li] = [18]:[1] showed the highest conductivity, close to 1.4×10-5 S cm-1 at 60 ˚C, while at lower temperatures, a PEOPO-material reached the highest conductivity, nearly 1.5×10-6 S cm-1 at 20 ˚C. The high conductivity of the former copolymer suggests weak interactions of the lithium ions with the pentafluorosulfonate anions in combination with a degree of Li+ dissociation facilitated by PEO. The results of the present study demonstrate that well-designed block copolymers containing lithium pentafluorostyrene sulfonate units can approach the levels of conductivity required for high-temperature lithium battery applications. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Polymer Chemistry
volume
8
issue
4
pages
10 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85010495325
  • wos:000394960900016
ISSN
1759-9954
DOI
10.1039/C6PY01910B
language
English
LU publication?
yes
id
94d1a805-365a-4f76-8eeb-49fd3c494722
date added to LUP
2016-12-13 09:55:15
date last changed
2018-04-15 04:39:01
@article{94d1a805-365a-4f76-8eeb-49fd3c494722,
  abstract     = {Solid single-ion conducting polymers continue to attract a significant interest as electrolyte materials with a great potential to improve safety and performance of energy storage devices. Still, their low conductivity is a significant hurdle presently preventing their application. Here, we report on highly conductive BAB triblock copolymers with A blocks of either poly(ethylene oxide) (PEO) or poly(ethylene oxide-<i>co</i>-propylene oxide) (PEOPO), and B blocks of poly(lithium 2,3,5,6-tetrafluorostyrene-4-sulfonate) (PPFSLi). The copolymers were conveniently synthesised by atom transfer radical polymerisation (ATRP) of 2,3,4,5,6-pentafluorostyrene from polyether macroinitiators, followed by quantitative thiolation using NaSH and subsequent oxidation to form the sulfonate anions. The copolymers possessed high thermal stability and their ionic content was conveniently controlled by the block ratio during the ATRP. Above the polyether melting point, a PEO-based block copolymers with [O]:[Li] = [18]:[1] showed the highest conductivity, close to 1.4×10<sup>-5</sup> S cm<sup>-1</sup> at 60 ˚C, while at lower temperatures, a PEOPO-material reached the highest conductivity, nearly 1.5×10<sup>-6</sup> S cm<sup>-1</sup> at 20 ˚C. The high conductivity of the former copolymer suggests weak interactions of the lithium ions with the pentafluorosulfonate anions in combination with a degree of Li<sup>+</sup> dissociation facilitated by PEO. The results of the present study demonstrate that well-designed block copolymers containing lithium pentafluorostyrene sulfonate units can approach the levels of conductivity required for high-temperature lithium battery applications.},
  author       = {Shao, Zhecheng and Jannasch, Patric},
  issn         = {1759-9954},
  language     = {eng},
  number       = {4},
  pages        = {785--794},
  publisher    = {Royal Society of Chemistry},
  series       = {Polymer Chemistry},
  title        = {Single lithium-ion conducting poly(tetrafluorostyrene sulfonate) – polyether block copolymer electrolytes},
  url          = {http://dx.doi.org/10.1039/C6PY01910B},
  volume       = {8},
  year         = {2017},
}