Cargando…
The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte
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...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7713362/ https://www.ncbi.nlm.nih.gov/pubmed/33273700 http://dx.doi.org/10.1038/s41598-020-78363-6 |
_version_ | 1783618563732406272 |
---|---|
author | Sedlak, Petr Gajdos, Adam Macku, Robert Majzner, Jiri Holcman, Vladimir Sedlakova, Vlasta Kubersky, Petr |
author_facet | Sedlak, Petr Gajdos, Adam Macku, Robert Majzner, Jiri Holcman, Vladimir Sedlakova, Vlasta Kubersky, Petr |
author_sort | Sedlak, Petr |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-7713362 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-77133622020-12-03 The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte Sedlak, Petr Gajdos, Adam Macku, Robert Majzner, Jiri Holcman, Vladimir Sedlakova, Vlasta Kubersky, Petr Sci Rep Article 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. Nature Publishing Group UK 2020-12-03 /pmc/articles/PMC7713362/ /pubmed/33273700 http://dx.doi.org/10.1038/s41598-020-78363-6 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Sedlak, Petr Gajdos, Adam Macku, Robert Majzner, Jiri Holcman, Vladimir Sedlakova, Vlasta Kubersky, Petr The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte |
title | The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte |
title_full | The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte |
title_fullStr | The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte |
title_full_unstemmed | The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte |
title_short | The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte |
title_sort | effect of thermal treatment on ac/dc conductivity and current fluctuations of pvdf/nmp/[emim][tfsi] solid polymer electrolyte |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7713362/ https://www.ncbi.nlm.nih.gov/pubmed/33273700 http://dx.doi.org/10.1038/s41598-020-78363-6 |
work_keys_str_mv | AT sedlakpetr theeffectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT gajdosadam theeffectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT mackurobert theeffectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT majznerjiri theeffectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT holcmanvladimir theeffectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT sedlakovavlasta theeffectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT kuberskypetr theeffectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT sedlakpetr effectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT gajdosadam effectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT mackurobert effectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT majznerjiri effectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT holcmanvladimir effectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT sedlakovavlasta effectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte AT kuberskypetr effectofthermaltreatmentonacdcconductivityandcurrentfluctuationsofpvdfnmpemimtfsisolidpolymerelectrolyte |