scholarly journals Impedance Spectroscopy and FTIR Studies of PEG - Based Polymer Electrolytes

2011 ◽  
Vol 8 (1) ◽  
pp. 347-353 ◽  
Author(s):  
Anji Reddy Polu ◽  
Ranveer Kumar
Keyword(s):  
Ionic Conductivity ◽  
Impedance Spectroscopy ◽  
Polymer Electrolytes ◽  
Frequency Region ◽  
Ceramic Filler ◽  
High Frequency Region ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Casting Technique ◽  
Ftir Studies

Ionic conductivity of poly(ethylene glycol) (PEG) - ammonium chloride (NH4Cl) based polymer electrolytes can be enhanced by incorporating ceramic filler TiO2into PEG-NH4Cl matrix. The electrolyte samples were prepared by solution casting technique. FTIR studies indicates that the complex formation between the polymer, salt and ceramic filler. The ionic conductivity was measured using impedance spectroscopy technique. It was observed that the conductivity of the electrolyte varies with TiO2concentration and temperature. The highest room temperature conductivity of the electrolyte of 7.72×10−6S cm-1was obtained at 15% by weight of TiO2and that without TiO2filler was found to be 9.58×10−7S cm−1. The conductivity has been improved by 8 times when the TiO2filler was introduced into the PEG–NH4Cl electrolyte system. The conductance spectra shows two distinct regions: a dc plateau and a dispersive region. The temperature dependence of the conductivity of the polymer electrolytes seems to obey the VTF relation. The conductivity values of the polymer electrolytes were reported and the results were discussed. The imaginary part of dielectric constant (εi) decreases with increase in frequency in the low frequency region whereas frequency independent behavior is observed in the high frequency region.

Ion transport studies in PVA:NH4CH3COO gel polymer electrolytes

2020 ◽  
Vol 32 (2) ◽  
pp. 208-219
Author(s):  
CP Singh ◽  
PK Shukla ◽  
SL Agrawal
Keyword(s):  
Ionic Conductivity ◽  
Ion Transport ◽  
Salt Concentration ◽  
Polymer Electrolytes ◽  
Poly Vinyl Alcohol ◽  
Infrared Analysis ◽  
Gel Polymer Electrolytes ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Mobility Of Charge Carriers

Ion conducting gel polymer electrolytes (GPEs) are being intensively studied for their potential applications in various electrochemical devices. The poly(vinyl alcohol)-based GPE films containing ammonium acetate (NH4CH3COO) salt have been studied for various concentrations of salt. The gel electrolyte films (GPEs) have been prepared using solution casting technique. Structural characterization carried out using X-ray diffraction reveals an increase in the amorphous nature of the samples on increasing salt concentration up to 70 wt%. The complexation of polymer and salt has been studied by Fourier-transform infrared analysis. Ionic conductivity of the GPEs has been found to increase with salt concentration and reaches an optimum for an intermediate concentration. The room temperature conductivity isotherm exhibits a maximum in conductivity of 2.64 × 10−4 Scm−1 for 65 wt% salt concentration. The temperature dependence of ionic conductivity exhibits a combination of Arrhenius and Vogel–Tamman–Fulcher behavior. Ion transport in the electrolyte system has been explored using dielectric response of the material and the observed variation in conductivity is suitably correlated to the change in charge carrier concentration and mobility of charge carriers.

scholarly journals Controlled ionic conductivity via tapered block polymer electrolytes

RSC Advances ◽  
2015 ◽  
Vol 5 (17) ◽  
pp. 12597-12604 ◽  
Author(s):  
Wei-Fan Kuan ◽  
Roddel Remy ◽  
Michael E. Mackay ◽  
Thomas H. Epps, III
Keyword(s):  
Ionic Conductivity ◽  
Ethylene Oxide ◽  
Polymer Electrolytes ◽  
Room Temperature ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Block Polymer

Tapered block polymer electrolytes have been developed and exhibited enhanced room temperature conductivity relative to poly(styrene-b-ethylene oxide) (P(S-EO)) and non-tapered poly(s-b-oligo-oxyethylene methacrylate) (P(S-OEM)) counterparts.

Investigation on the Effect of TiO2 Nanofiller to the Structural and Conductivity Characteristics of Poly(vinylidene fluoride-co-hexafluoropropylene)/Poly(ethyl methacrylate) Based Polymer Electrolytes System

2013 ◽  
Vol 594-595 ◽  
pp. 604-607
Author(s):  
Siti Rudhziah ◽  
N.S. Mohamed
Keyword(s):  
Polymer Electrolytes ◽  
Vinylidene Fluoride ◽  
Scanning Calorimetry ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Casting Technique ◽  
Ethyl Methacrylate ◽  
Nanocomposite Polymer ◽  
Poly Vinylidene Fluoride ◽  
Solution Casting Technique

In this study, Poly (vinylidene fluoride-co-hexafluoropropylene)/Poly (ethyl methacrylate (PEMA) nanocomposite polymer electrolytes was prepared by solution casting technique. The effects of TiO2 nanofiller on the structural, thermal and conductivity characteristics were examined using x-ray diffraction, scanning electron microscopy, differential scanning calorimetry and impedance spectroscopy. The crystallinity and conductivity of the salted system are found to increase with the addition of TiO2. The system containing 5 wt % of TiO2 exhibited the highest room temperature conductivity of 1.32 × 10-3 S cm-1.

Ionic Transport in PMMA-NaCF3SO3 Gel Polymer Electrolyte

2012 ◽  
Vol 545 ◽  
pp. 259-263 ◽  
Author(s):  
Zurina Osman ◽  
Siti Mariam Samin ◽  
Lisani Othman ◽  
Khairul Bahiyah Md. Isa
Keyword(s):  
Ionic Conductivity ◽  
Polymer Electrolyte ◽  
Gel Polymer Electrolyte ◽  
Transference Number ◽  
Ionic Mobility ◽  
Charge Carriers ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Casting Technique ◽  
Mobility Of Charge Carriers

In this work, the polymethylmethacrylate (PMMA) based gel polymer electrolyte samples have been prepared by the solution casting technique. The composition range of the salt was from 3 wt% to 35 wt%. The ionic conductivity of the samples was measured using a.c. impedance technique. The highest room temperature conductivity was obtained from the sample containing 30 wt% of NaCF3SO3 salt, i.e. 5.31 x 10-3 S cm-1. The increase in the ionic conductivity with increasing salt concentrations is due to the increase in both concentration and mobility of charge carriers. The decrease in ionic conductivity at higher salt concentrations can be explained by aggregation of the ions, leading to the formation of ion-pair, thus decreasing the number of charge carriers and hence the ionic mobility. The conductivity-temperature dependence obeys the Arrhenius rule from which the activation energy was evaluated. The ionic transference number estimated by dc polarization method revealed that the conducting species are predominantly ions.

Electrical Property of Methylcellulose/Chitosan-NH4NO3-EC Plasticized Polymer Electrolyte

2015 ◽  
Vol 719-720 ◽  
pp. 82-86 ◽  
Author(s):  
N.L.M. Zazuli ◽  
A.S.A. Khiar
Keyword(s):  
Electrical Property ◽  
Polymer Electrolytes ◽  
Room Temperature ◽  
Ethylene Carbonate ◽  
Solution Casting ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Casting Technique ◽  
Dielectric Data ◽  
Solution Casting Technique

Polymer electrolytes blends of methylcellulose (MC)/chitosan-ammonium triflate (NH4CF3SO3) plasticized with Ethylene Carbonate (EC) were prepared by solution-casting technique. The effect on electrical property was investigated by impedance spectroscopy. Sample with 45 wt% of EC exhibit the highest room temperature conductivity of 2.16 × 10-4 Scm-1. Dielectric data were analyzed for the sample with the highest conductivity.

scholarly journals Ionic conductivity and relaxation studies in PVDF-HFP:PMMA-based gel polymer blend electrolyte with LiClO4 salt

2018 ◽  
Vol 08 (01) ◽  
pp. 1850005 ◽  
Author(s):  
Khushbu Gohel ◽  
D. K. Kanchan
Keyword(s):  
Ionic Conductivity ◽  
Vinylidene Fluoride ◽  
Electrochemical Impedance ◽  
Salt Content ◽  
Lithium Perchlorate ◽  
Conductivity Relaxation ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Casting Technique ◽  
Debye Peak

Poly(vinylidene fluoride-hexafluropropylene) (PVDF-HFP) and poly(methyl methacrylate) (PMMA)-based gel polymer electrolytes (GPEs) comprising propylene carbonate and diethyl carbonate mixed plasticizer with variation of lithium perchlorate (LiClO4) salt concentrations have been prepared using a solvent casting technique. Structural characterization has been carried out using XRD wherein diffraction pattern reveals the amorphous nature of sample up to 7.5[Formula: see text]wt.% salt and complexation of polymers and salt have been studied by FTIR analysis. Surface morphology of the samples has been studied using scanning electron microscope. Electrochemical impedance spectroscopy in the temperature range 303–363[Formula: see text]K has been carried out for electrical conductivity. The maximum room temperature conductivity of 2.83[Formula: see text][Formula: see text]S cm[Formula: see text] has been observed for the GPE incorporating 7.5[Formula: see text]wt.% LiClO4. The temperature dependence of ionic conductivity obeys the Arrhenius relation. The increase in ionic conductivity with change in temperatures and salt content is observed. Transport number measurement is carried out by Wagner’s DC polarization method. Loss tangent (tan [Formula: see text]) and imaginary part of modulus ([Formula: see text]) corresponding to dielectric relaxation and conductivity relaxation respectively show faster relaxation process with increasing salt content up to optimum value of 7.5[Formula: see text]wt.% LiClO4. The modulus ([Formula: see text]) shows that the conductivity relaxation is of non-Debye type (broader than Debye peak).

Polymer Electrolyte of PVDF-HFP/PEMA-NH4CF3So3-TiO2 and its Application in Proton Batteries

2011 ◽  
Vol 287-290 ◽  
pp. 285-288
Author(s):  
Siti Rudhziah ◽  
Salmiah Ibrahim ◽  
Mohamed Nor Sabirin
Keyword(s):  
Impedance Spectroscopy ◽  
Titanium Oxide ◽  
Polymer Electrolytes ◽  
Polyvinylidene Fluoride ◽  
Room Temperature ◽  
Composite Polymer ◽  
Electrolyte System ◽  
Composite Polymer Electrolytes ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity

In this study, composite polymer electrolytes were prepared by addition of titanium oxide, TiO2nanofiller into polyvinylidene fluoride-co-hexafluoropropylene/polymethyl methacrylate-ammonium triflate (PVDF-HFP/PEMA-NH4CF3SO3) complex. The effect of TiO2on conductivity of the complex was examined using impedance spectroscopy. The highest room temperature conductivity of 1.32 × 10-3S cm-1was shown by the system containing 5 wt % of TiO2. This system was used for the fabrication of proton batteries with the configurations of (Zn + ZnSO4.7H2O + C + PTFE)/PVDF-HFP/PEMA-NH4CF3SO3-(5wt%)TiO2/(MnO2 + C + PTFE) and (Zn + ZnSO4.7H2O + C + PTFE)/PVDF-HFP/PEMA-NH4CF3SO3-(5wt%)TiO2/(MnO2 + PbO2+ C + PTFE). The performance of the batteries indicated potential application of the electrolyte system in proton batteries.

Characterization of Plasticized PMMA-LiClO4 Solid Polymer Electrolytes

2012 ◽  
Vol 585 ◽  
pp. 185-189 ◽  
Author(s):  
Rajni Sharma ◽  
Anjan Sil ◽  
Subrata Ray
Keyword(s):  
Ionic Conductivity ◽  
Polymer Electrolytes ◽  
Thermal Analyses ◽  
Impedance Analysis ◽  
Solid Polymer Electrolytes ◽  
Solid Polymer ◽  
Casting Technique ◽  
Ac Impedance Analysis ◽  
Solution Casting Technique

In the present work, the effect of Li salt i.e. LiClO4 contained in composite plasticizer (PC+DEC) with three different concentrations on ionic transport and other electrochemical properties of PMMA based gel polymer electrolytes synthesized has been investigated. The electrolytes have been synthesized by solution casting technique by varying the wt (%) of salt and plasticizer. The formation of polymer-salt complexes and their structural characterization have been carried out by FTIR spectroscopic and XRD analyses. The room temperature ionic conductivity of the electrolyte composition 0.6PMMA-0.125(PC+DEC)-0.15LiClO4 (wt %) has been found to be maximum whose magnitude is 0.40×10-5 S/cm as determined by ac impedance analysis. The temperature dependent ionic conductivity of electrolyte sample0.6PMMA-0.125(PC+DEC)-0.15LiClO4 has further been investigated. Thermal analyses of electrolyte samples of all three compositions have also been done.

Ionic Conductivity, Morphology and Transport Number of Lithium Ions in PMMA Based Gel Polymer Electrolytes

2013 ◽  
Vol 334-335 ◽  
pp. 137-142 ◽  
Author(s):  
Lisani Othman ◽  
Khairul Bahiyah Md. Isa ◽  
Zurina Osman ◽  
Rosiyah Yahya
Keyword(s):  
Ionic Conductivity ◽  
Salt Concentration ◽  
Polymer Electrolytes ◽  
Ethylene Carbonate ◽  
Transference Number ◽  
Gel Polymer Electrolytes ◽  
Casting Technique ◽  
Ionic Transference Number ◽  
Temperature Dependence Of Conductivity ◽  
Solution Casting Technique

The gel polymer electrolytes (GPEs) composed of polymethylmethacrylate (PMMA) with lithium trifluoromethanesulfonate (LiCF3SO3) salt dissolved in a binary mixture of ethylene carbonate (EC) and propylene carbonate (PC) organic solvents have been prepared by the solution casting technique. The samples are prepared by varying the salt concentrations from 5 wt.% to 30 wt.%. Impedance spectroscopy measurement has been carried out to determine the ionic conductivity of the samples. The sample containing 25 wt.% of LiCF3SO3salt exhibits the highest room temperature ionic conductivity of 2.56 x 10-3S cm-1. The conductivity of the GPEs has been found to depend on the salt concentration added to the sample, while at higher salt concentration reveals a decrease in the ionic conductivity due to ions association. The temperature dependence of conductivity from 303 K to 373 K is found to obey the Arrhenius law. The ionic transference number,tiof GPEs has been estimated by the DC polarization method and the value is found to be 0.98, 0.93, and 0.97 for the sample containing 25 wt.%, 5 wt.% and 30 wt.% respectively. This result is consistent with the conductivity studies.

A comparative study of Li10.35Ge1.35P1.65S12 and Li10.5Ge1.5P1.5S12 superionic conductors

2020 ◽  
Vol 13 (06) ◽  
pp. 2050031
Author(s):  
Yue Jiang ◽  
Zhiwei Hu ◽  
Ming’en Ling ◽  
Xiaohong Zhu
Keyword(s):  
Ionic Conductivity ◽  
Room Temperature ◽  
Ionic Conductivities ◽  
Lithium Ion ◽  
Lattice Parameter ◽  
Superionic Conductors ◽  
Chemical Compositions ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Ion Conductor

Since the lithium-ion conductor Li[Formula: see text]GeP2S[Formula: see text] (LGPS) with a super high room-temperature conductivity of 12[Formula: see text]mS/cm was first reported in 2011, sulfide-type solid electrolytes have been paid much attention. It was suggested by Kwon et al. [J. Mater. Chem. A 3, 438 (2015)] that some excess lithium ions in LGPS, namely, Li[Formula: see text]Ge[Formula: see text] P[Formula: see text]S[Formula: see text], could further improve their ionic conductivities, and the highest conductivity of 14.2[Formula: see text]mS/cm was obtained at [Formula: see text] though a larger lattice parameter that occurred at [Formula: see text]. In this study, we focus on these two different chemical compositions of LGPS with [Formula: see text] and [Formula: see text], respectively. Both samples were prepared using the same experimental process. Their lattice parameter, microstructure and room-temperature ionic conductivity were compared in detail. The results show that the main phase is the tetragonal LGPS phase but with a nearly identical amount of orthorhombic LGPS phase coexisting in both samples. Bigger lattice parameters, larger grain sizes and higher ionic conductivities are simultaneously achieved in Li[Formula: see text]Ge[Formula: see text]P[Formula: see text]S[Formula: see text] ([Formula: see text]), exhibiting an ultrahigh room-temperature ionic conductivity of 18.8[Formula: see text]mS/cm.

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