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Highly conductive nonstoichiometric protic poly(ionic liquid) electrolytes

Karlsson, Christoffer LU and Jannasch, Patric LU (2019) In ACS Applied Energy Materials 2(9). p.6841-6850
Abstract
Nonstoichiometric protic ionic liquids have recently gained interest because proton acceptors are crucial in the electrolyte of many electrochemical applications such as fuel cells, proton batteries and supercapacitors. In the present work we have prepared and studied several protic poly(ionic liquid)s doped with acid in nonstoichiometric amounts. The poly(ionic liquid)s were based on polydimethylsiloxane backbones functionalized with imidazole, 1,2,4-triazole and benzimidazole groups, respectively, via flexible alkyl spacer units. These polymers did not show any observable glass transition above -50 °C, resulting in high charge mobility and conductivities of up to 19 µS/cm at 25 °C. Additional doping with free imidazole significantly... (More)
Nonstoichiometric protic ionic liquids have recently gained interest because proton acceptors are crucial in the electrolyte of many electrochemical applications such as fuel cells, proton batteries and supercapacitors. In the present work we have prepared and studied several protic poly(ionic liquid)s doped with acid in nonstoichiometric amounts. The poly(ionic liquid)s were based on polydimethylsiloxane backbones functionalized with imidazole, 1,2,4-triazole and benzimidazole groups, respectively, via flexible alkyl spacer units. These polymers did not show any observable glass transition above -50 °C, resulting in high charge mobility and conductivities of up to 19 µS/cm at 25 °C. Additional doping with free imidazole significantly increased the conductivity, to 0.15 mS/cm at 25 °C, more than four orders of magnitude higher than in the nondoped state. The origins of the fast charge transport in these polymer electrolytes were investigated by electrochemical impedance spectroscopy and electrode polarization analysis. The results indicate that these kinds of nonstoichiometric protic poly(ionic liquid)s have potential as high-performance electrolytes for room temperature electrochemical cells, such as organic proton batteries, where the availability of both proton donors and acceptors is important. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
ACS Applied Energy Materials
volume
2
issue
9
pages
6841 - 6850
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85072604983
ISSN
2574-0962
DOI
10.1021/acsaem.9b01280
language
English
LU publication?
yes
id
10060549-25b6-4e52-b4bf-13691eebab39
date added to LUP
2019-08-24 15:23:52
date last changed
2019-10-23 06:22:06
@article{10060549-25b6-4e52-b4bf-13691eebab39,
  abstract     = {Nonstoichiometric protic ionic liquids have recently gained interest because proton acceptors are crucial in the electrolyte of many electrochemical applications such as fuel cells, proton batteries and supercapacitors. In the present work we have prepared and studied several protic poly(ionic liquid)s doped with acid in nonstoichiometric amounts. The poly(ionic liquid)s were based on polydimethylsiloxane backbones functionalized with imidazole, 1,2,4-triazole and benzimidazole groups, respectively, via flexible alkyl spacer units. These polymers did not show any observable glass transition above -50 °C, resulting in high charge mobility and conductivities of up to 19 µS/cm at 25 °C. Additional doping with free imidazole significantly increased the conductivity, to 0.15 mS/cm at 25 °C, more than four orders of magnitude higher than in the nondoped state. The origins of the fast charge transport in these polymer electrolytes were investigated by electrochemical impedance spectroscopy and electrode polarization analysis. The results indicate that these kinds of nonstoichiometric protic poly(ionic liquid)s have potential as high-performance electrolytes for room temperature electrochemical cells, such as organic proton batteries, where the availability of both proton donors and acceptors is important.},
  author       = {Karlsson, Christoffer and Jannasch, Patric},
  issn         = {2574-0962},
  language     = {eng},
  number       = {9},
  pages        = {6841--6850},
  publisher    = {The American Chemical Society (ACS)},
  series       = {ACS Applied Energy Materials},
  title        = {Highly conductive nonstoichiometric protic poly(ionic liquid) electrolytes},
  url          = {http://dx.doi.org/10.1021/acsaem.9b01280},
  volume       = {2},
  year         = {2019},
}