Publication detail

The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte

SEDLÁK, P. GAJDOŠ, A. MACKŮ, R. MAJZNER, J. HOLCMAN, V. SEDLÁKOVÁ, V. KUBERSKÝ, P.

Original Title

The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte

Type

journal article in Web of Science

Language

English

Original Abstract

The experimental study deals with the investigation of the effect of diverse crystallinity of imidazolium ionic-liquid-based SPE on conductivity and current fluctuations. The experimental study was carried out on samples consisting of [EMIM][TFSI] as ionic liquid, PVDF as a polymer matrix and NMP as a solvent. After the deposition, the particular sample was kept at an appropriate temperature for a specific time in order to achieve different crystalline forms of the polymer in the solvent, since the solvent evaporation rate controls crystallization. The ac/dc conductivities of SPEs were investigated across a range of temperatures using broadband dielectric spectroscopy in terms of electrical conductivity. In SPE samples of the higher solvent evaporation rate, the real parts of conductivity spectra exhibit a sharper transition during sample cooling and an increase of overall conductivity, which is implied by a growing fraction of the amorphous phase in the polymer matrix in which the ionic liquid is immobilized. The conductivity master curves illustrate that the changing of SPEs morphology is reflected in the low frequency regions governed by the electrode polarization effect. The dc conductivity of SPEs exhibits Vogel-Fulcher-Tammann temperature dependence and increases with the intensity of thermal treatment. Spectral densities of current fluctuations showed that flicker noise, thermal noise and shot noise seems to be major noise sources in all samples. The increase of electrolyte conductivity causes a decrease in bulk resistance and partially a decrease in charge transfer resistance, while also resulting in an increase in shot noise. However, the change of electrode material results in a more significant change of spectral density of current fluctuations than the modification of the preparation condition of the solid polymer electrolyte. Thus, the contact noise is considered to contribute to overall current fluctuations across the samples.

Keywords

solid polymer electrolyte; current fluctuations; Poly(vinylidene fluoride); imidazolium ionic liquid; solvent evaporation temperature; conductivity; Vogel-Fulcher-Tammann dependence; interdigital electrode.

Authors

SEDLÁK, P.; GAJDOŠ, A.; MACKŮ, R.; MAJZNER, J.; HOLCMAN, V.; SEDLÁKOVÁ, V.; KUBERSKÝ, P.

Released

3. 12. 2020

Publisher

NATURE RESEARCH

Location

BERLIN

ISBN

2045-2322

Periodical

Scientific Reports

Year of study

10

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

12

Pages count

12

URL

https://www.nature.com/articles/s41598-020-78363-6

Full text in the Digital Library

http://hdl.handle.net/11012/195854

BibTex

@article{BUT166312,
  author="Petr {Sedlák} and Adam {Gajdoš} and Robert {Macků} and Jiří {Majzner} and Vladimír {Holcman} and Vlasta {Sedláková} and Petr {Kuberský}",
  title="The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte",
  journal="Scientific Reports",
  year="2020",
  volume="10",
  number="1",
  pages="1--12",
  doi="10.1038/s41598-020-78363-6",
  issn="2045-2322",
  url="https://www.nature.com/articles/s41598-020-78363-6"
}