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Amphiphilic polymer gel electrolytes. 3. Influence of the ionophobic-ionophilic balance on the ion conductive properties

Gavelin, Patrik LU ; Ljungbäck, Ronnie; Jannasch, Patric LU and Wesslén, Bengt LU (2001) In Electrochimica Acta 46(10-11). p.1439-1446
Abstract
Gel electrolytes based on amphiphilic copolymethacrylates containing ethylene oxide (EO)(n) side chains as ionophilic units and fluorocarbon (CF,), side chains as ionophobic units showed a substantial increase in ion conductivity, as compared to corresponding gels based on homopolymers of (EO),, methacrylate. The highest ion conductivity was found for a gel based on a copolymer composed of 24 wt% of (EO)(9) methacrylate and 76 wt% of fluorocarbon methacrylate. This gel contained 70 wt% of 1 M LIPF6 gamma -butyrolactone, and had an ion conductivity of 4.0 mS/cm at 20 degreesC, and 1.0 mS/cm at - 20 degreesC. It was found that gels based on fluorocarbon-containing copolymers having (EO), side chains had higher ion conductivities than gels... (More)
Gel electrolytes based on amphiphilic copolymethacrylates containing ethylene oxide (EO)(n) side chains as ionophilic units and fluorocarbon (CF,), side chains as ionophobic units showed a substantial increase in ion conductivity, as compared to corresponding gels based on homopolymers of (EO),, methacrylate. The highest ion conductivity was found for a gel based on a copolymer composed of 24 wt% of (EO)(9) methacrylate and 76 wt% of fluorocarbon methacrylate. This gel contained 70 wt% of 1 M LIPF6 gamma -butyrolactone, and had an ion conductivity of 4.0 mS/cm at 20 degreesC, and 1.0 mS/cm at - 20 degreesC. It was found that gels based on fluorocarbon-containing copolymers having (EO), side chains had higher ion conductivities than gels based on copolymers containing (EO), side chains. The study showed that it is important to control the ionophobic-ionophilic balance of the amphiphilic copolymer in order to achieve high ion conductivities in the gel electrolyte. It is very likely that the ionophobic side chains of the copolymer associated to form microdomains in the electrolyte. It is also likely that longer EO chains increased the stability of these microdomains in the electrolyte. However, strong lithium ion coordination to EO chains above a critical chain length may have suppressed the ion conductivity of the gels. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Amphiphilic graft copolymer, Ionophobic–Ionophilic balance, Gel electrolyte, Ion conductivity, Fluorocarbon chains
in
Electrochimica Acta
volume
46
issue
10-11
pages
1439 - 1446
publisher
Pergamon
external identifiers
  • scopus:0035868421
ISSN
0013-4686
DOI
10.1016/S0013-4686(00)00737-4
language
English
LU publication?
yes
id
3506f1f6-9e1e-4189-9b29-a50d81dc08b3 (old id 150776)
date added to LUP
2007-07-13 11:51:53
date last changed
2018-09-09 03:43:57
@article{3506f1f6-9e1e-4189-9b29-a50d81dc08b3,
  abstract     = {Gel electrolytes based on amphiphilic copolymethacrylates containing ethylene oxide (EO)(n) side chains as ionophilic units and fluorocarbon (CF,), side chains as ionophobic units showed a substantial increase in ion conductivity, as compared to corresponding gels based on homopolymers of (EO),, methacrylate. The highest ion conductivity was found for a gel based on a copolymer composed of 24 wt% of (EO)(9) methacrylate and 76 wt% of fluorocarbon methacrylate. This gel contained 70 wt% of 1 M LIPF6 gamma -butyrolactone, and had an ion conductivity of 4.0 mS/cm at 20 degreesC, and 1.0 mS/cm at - 20 degreesC. It was found that gels based on fluorocarbon-containing copolymers having (EO), side chains had higher ion conductivities than gels based on copolymers containing (EO), side chains. The study showed that it is important to control the ionophobic-ionophilic balance of the amphiphilic copolymer in order to achieve high ion conductivities in the gel electrolyte. It is very likely that the ionophobic side chains of the copolymer associated to form microdomains in the electrolyte. It is also likely that longer EO chains increased the stability of these microdomains in the electrolyte. However, strong lithium ion coordination to EO chains above a critical chain length may have suppressed the ion conductivity of the gels.},
  author       = {Gavelin, Patrik and Ljungbäck, Ronnie and Jannasch, Patric and Wesslén, Bengt},
  issn         = {0013-4686},
  keyword      = {Amphiphilic graft copolymer,Ionophobic–Ionophilic balance,Gel electrolyte,Ion conductivity,Fluorocarbon chains},
  language     = {eng},
  number       = {10-11},
  pages        = {1439--1446},
  publisher    = {Pergamon},
  series       = {Electrochimica Acta},
  title        = {Amphiphilic polymer gel electrolytes. 3. Influence of the ionophobic-ionophilic balance on the ion conductive properties},
  url          = {http://dx.doi.org/10.1016/S0013-4686(00)00737-4},
  volume       = {46},
  year         = {2001},
}