scholarly journals Surface Analyses of PVDF/NMP/[EMIM][TFSI] Solid Polymer Electrolyte

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2678
Author(s):  
Petr Sedlak ◽  
Dinara Sobola ◽  
Adam Gajdos ◽  
Rashid Dallaev ◽  
Alois Nebojsa ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Ionic Liquid ◽  
Chemical Composition ◽  
Polymer Electrolyte ◽  
Photoelectron Spectroscopy ◽  
Evaporation Rate ◽  
Solvent Evaporation ◽  
Solid Polymer ◽  
Imidazolium Ionic Liquid ◽  
Scanning Calorimetry

Thermal treatment conditions of solid polymer polymer electrolyte (SPE) were studied with respect to their impact on the surface morphology, phase composition and chemical composition of an imidazolium ionic-liquid-based SPE, namely PVDF/NMP/[EMIM][TFSI] electrolyte. These investigations were done using scanning electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry as well as X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectroscopy. A thoroughly mixed blend of polymer matrix, ionic liquid and solvent was deposited on a ceramic substrate and was kept at a certain temperature for a specific time in order to achieve varying crystallinity. The morphology of all the electrolytes consists of spherulites whose average diameter increases with solvent evaporation rate. Raman mapping shows that these spherulites have a semicrystalline structure and the area between them is an amorphous region. Analysis of FTIR spectra as well as Raman spectroscopy showed that the β-phase becomes dominant over other phases, while DSC technique indicated decrease of crystallinity as the solvent evaporation rate increases. XPS and ToF-SIMS indicated that the chemical composition of the surface of the SPE samples with the highest solvent evaporation rate approaches the composition of the ionic liquid.

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

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Petr Sedlak ◽  
Adam Gajdos ◽  
Robert Macku ◽  
Jiri Majzner ◽  
Vladimir Holcman ◽  
...  
Keyword(s):  
Experimental Study ◽  
Ionic Liquid ◽  
Thermal Treatment ◽  
Polymer Electrolyte ◽  
Polymer Matrix ◽  
Shot Noise ◽  
Solid Polymer Electrolyte ◽  
Evaporation Rate ◽  
Solid Polymer ◽  
Current Fluctuations

AbstractThe 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.

Thermal Analysis of 1-Ethyl-3-Methylimidazolium Trifluoromethanesulfonate Ionic Liquid to PEO-NaCF3SO3 Polymer Electrolyte

2017 ◽  
Vol 268 ◽  
pp. 338-342 ◽  
Author(s):  
Mohd Noor Zairi Mohd Sapri ◽  
Azizah Hanom Ahmad ◽  
Mohd Muzamir Mahat
Keyword(s):  
Ionic Liquid ◽  
Polymer Electrolyte ◽  
Transference Number ◽  
Solid Polymer ◽  
Scanning Calorimetry ◽  
As Doping ◽  
Ionic Transference Number ◽  
Sodium Trifluoromethanesulfonate ◽  
Solution Cast ◽  
Ion Conducting

The objective of this study is to investigate the effect of ionic liquid to PEO-NaCF3SO3 solid polymer electrolyte. Sodium ion conducting polymer electrolyte films consisting of Polyethylene oxide (PEO) as a polymer host, Sodium trifluoromethanesulfonate (NaCF3SO3) as doping salt and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMiTF) as ionic liquid has been prepared by solution cast technique. Different amounts (5, 10, 15, 20, 25 and 30 wt. %) of EMiTF will be added to the optimized polymer-salt composition to develop PEO - NaCF3SO3 – EMiTF polymer electrolyte. Difference Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA) indicated that the crystalline degree and the weight loss % of the electrolyte decrease with increasing the wt. % of the EMiTF respectively. The ionic transference number was found in the value of 0.95 which suggests that ions are the charge carriers.

Low-viscosity ionic liquid–doped solid polymer electrolytes

2018 ◽  
Vol 30 (8) ◽  
pp. 986-992 ◽  
Author(s):  
Sandhya Gupta ◽  
Pramod K Singh ◽  
B Bhattacharya
Keyword(s):  
Ionic Liquid ◽  
Impedance Spectroscopy ◽  
Polymer Electrolyte ◽  
Polymer Electrolytes ◽  
Solid Polymer Electrolytes ◽  
Solid Polymer ◽  
Scanning Calorimetry ◽  
Low Viscosity ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Polymer electrolyte films based on poly(ethylene oxide) doped with salt sodium nitrate and ionic liquid (IL; 1-ethyl 3-methylimidazolium thiocyanate) have been prepared and characterized by differential scanning calorimetry (DSC) and impedance spectroscopy. The relative percentage of crystallinity of polymer electrolytes has been calculated by using DSC thermograms and electrical properties by using impedance spectroscopy. The incorporation of IL in polymer matrix increases the conductivity of polymer electrolyte. The maximum value of ionic conductivity of polymer electrolyte is found to be 1.93 × 10−4 S m−1 with 9 wt% IL.

Preparation of Solid Polymer Actuator Based on PEDOT/NBR/Ionic Liquid

2005 ◽  
Vol 297-300 ◽  
pp. 641-645 ◽  
Author(s):  
Mi Suk Cho ◽  
Jae Do Nam ◽  
Hyouk Ryeol Choi ◽  
Ja Choon Koo ◽  
Young Kwan Lee
Keyword(s):  
Ionic Liquid ◽  
Polymer Electrolyte ◽  
Conducting Polymer ◽  
Solid Polymer Electrolyte ◽  
Base Material ◽  
Chemical Oxidation ◽  
Solid Polymer ◽  
Molding Process ◽  
Beam Radiation ◽  
Polymer Actuator

The fabrication of dry type conducting polymer actuator was presented. In the preparation of actuator system, nitrile rubber (NBR) was used as a base material of the solid polymer electrolyte. Thin films of NBR (150-200μ m) were prepared by compression molding process. The conducting polymer, poly (3,4- ethylenedioxythiophene) (PEDOT) was synthesized on the surface of NBR by chemical oxidation polymerization technique, and the room temperature ionic liquid, 1-ethyl-3- methylimidazolium bis (trifluoromethyl sulfonyl) imide (EMITFSI) was introduced into the composite film. The ionic conductivity of new type solid polymer electrolyte as a function of the immersion time and the cyclic voltammetry responses and the redox switching dynamics of PEDOT in NBR/ionic liquid solid polymer electrolyte were studied. The displacement of actuator was measured by laser beam radiation.

Pulse Polymerized Poly(3,4-ethylenedioxythiophene) Electrodes For Solid-State Supercapacitors with Ionic Liquid Gel Polymer Electrolyte

2012 ◽  
Vol 1448 ◽  
Author(s):  
G. P. Pandey ◽  
A. C. Rastogi
Keyword(s):  
Ionic Liquid ◽  
Solid State ◽  
Polymer Electrolyte ◽  
Photoelectron Spectroscopy ◽  
Gel Polymer Electrolyte ◽  
Charge Transfer Resistance ◽  
Polymer Chains ◽  
Transfer Resistance ◽  
Spectroscopy Studies ◽  
Highly Porous

ABSTRACTPoly(3,4-ethylenedioxythiophene) (PEDOT) electrodes are prepared by a novel ultrashort galvanic pulse electropolymerization technique for application in solid-state supercapacitors. Microstructure studies using scanning electron microscopy (SEM) show that PEDOT electrodes deposited by pulse polymerization are highly porous as compared to the conventional potentiostatic polymerization. In addition, as revealed by the X-ray photoelectron spectroscopy (XPS) studies in the PEDOT films formed by pulse polymerization, the polymer chains are fully conjugated with the dopant ClO4- ions. Solid-state supercapacitor cells using pulse polymerized PEDOT electrodes and ionic liquid gel polymer electrolyte were fabricated and characterized. The impedance spectroscopy studies show that the pulse polymerized PEDOT electrode have specific capacitance value of ∼ 65 F g-1 as compared to ∼52 F g-1for potentiostatically polymerized PEDOT and significantly lower interfacial and charge transfer resistance. Cyclic voltammetry (CV) and galvanostatic charge-discharge characterization show highly capacitive behavior of the supercapacitor cells in the solid-state configuration.

scholarly journals Investigations on the Effect of Chitin Nanofiber in PMMA Based Solid Polymer Electrolyte Systems

2014 ◽  
Vol 17 (3) ◽  
pp. 147-152 ◽  
Author(s):  
P. M. Shyly ◽  
S. Dawn Dharma Roy ◽  
Paitip Thiravetyan ◽  
S. Thanikaikarasan ◽  
P. J. Sebastian ◽  
...  
Keyword(s):  
Polymer Electrolyte ◽  
Solid Polymer Electrolyte ◽  
Ionic Conductivities ◽  
Impedance Analysis ◽  
Phase Changes ◽  
Solid Polymer ◽  
Scanning Calorimetry ◽  
Hydrolysis Method ◽  
Chitin Nanofiber ◽  
Membrane Technique

Polymer electrolyte membranes find application in a variety of fields such as battery systems, fuel cells, sensors and other electrochemical devices. In this paper we have done some investigations on the effect of chitin nanofiber (CNF) in PMMA based solid polymer electrolyte systems. CNF was synthesized from shrimp cell chitin by stepwise purification and acid hydrolysis method. PMMA basedelectrolyte films containing different concentrations of lithium salt and CNFs as filler were prepared by hot-press membrane technique. Crystalline nature and phase changes in polymer electrolytes were confirmed by X-ray diffraction analysis. Thermal behavior of the polymer electrolyte systems was studied by differential scanning calorimetry. Ionic conductivities of the electrolytes have been determined using a.c. impedance analysis in the temperature range between 303 and 393K. The temperature–dependent ionic conductivity

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