Ion transport property of hot-press cast Mg 2+ -ion conducting nano-composite p olymer electrolyte membranes: Study of effect of active/passive filler particle dispersal on conductivity (original) (raw)
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NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020, 2021
In the present work, effect of nanoparticles (TiO2, MgO, ZnO or Al2O3) on solid polymer electrolyte (SPE) comprising polyvinylideneflouride-co-hexaflouropropylene (PVDF-HFP) and magnesium chloride (MgCl2) has been explored. These films have been synthesized using the universal solution cast technique. Impedance Spectroscopy, X-ray Diffraction (XRD), Fourier transform infrared (FTIR)Spectroscopy and Differential scanning calorimetry-Thermogravimetric analysis (DSC-TGA) have been carried out to characterize transport, structural and thermal properties of these NCPE films. The highest conductivity value is 1.24x10-4 S/cm at 110 ˚C with activation energy ~0.26eV for OCC of NCPE. The dielectric study was also done for OCC of NCPE in wide range of frequency and temperature. Electrochemical cell has been fabricated using cell configuration Mg|NCPE|C-cell and various cell parameters have been calculated from discharge characteristics. INTRODUCION Since 1991, Lithium ion conducting rechargeable batteries are gaining attention to fulfill energy requirements of our daily needs (hybrid electric vehicles, laptop, cell phones, and camera etc.)[1] Li ion conducting polymer electrolytes used in battery device, studied by various researchers and faced problem like high cost and highly reactive nature so working with lithium is quite challenging. [2] This cause the search of other substitute like sodium, potassium and divalent ions (Mg +2 and Zn +2) conducting polymer electrolytes for battery application. Rammohan et al. (2015) reported sodium ion conducting polymer electrolyte (PVA/PEG:NaClO4 with ionic conductivity of ~2.41x10-6 S/cm), prepared by solution casting method.[3] Potassium ion (K +) conducting electrolyte reported by Murugendrappa et al. [4]with poly (ethylene glycol) (PEG) polymer as host with different salt (salt like KCl, KBr and KI) complexation in it and effect of different salt on polymer with change in temperature from 299 to 331 K. They observed that when KCl and KBr mixed in PEG its conductivity value increased by about 2.5 times for KCl and about 6.25 times for KBr, while on mixing KI its conductivity reduced about 0.05 times its pure component value. Magnesium ion (Mg 2+) conducting polymer electrolyte reported by Ravindran et al. (2012) having composition: PEG-[Mg (CH3COO)2-Mg(NO3)2]: [40-45-(7.5-7.5)] system, synthesized by solution casting method and have maximum ionic conductivity ~9.852x10-6 S/cm at room temperature.[5] Noto et al. also reported Mg 2+ ion conducting polymer electrolyte (PEG400/(MgCl2)x (0.00329≤ x ≤0.7000) in eight different compositions). They studied the mechanism of ionic motion in polymer. [6] Now days PVDF based electrolyte gaining attention due to its high dielectric constant in place of PEG. Leons et. al. (2013) reported PVDF based solid polymer electrolyte: PVDF-TrFE-NTf2, prepared by solvent casting method and they got maximum value of ionic conductivity i.e. 1.7x10-5 S/cm for 32 wt% of ionic liquid at 110˚C.[7]. Rechargeable magnesium batteries with good efficiency using solid nanocomposite polymer electrolyte thin films are interesting area of research. By using thermally and mechanically stable electrolytes, desirable shape, size and low weight batteries can be developed. From literature survey, it reveals that nanoparticles (Al2O3, MgO, ZnO, TiO2, CuO and
2013
Ion transport in poly (ethylene oxide) based Solid Polymer Electrolyte (SPE) membranes: [(1−x)PEO: xAg(ClO4)], where x = 0, 2, 4, 6, 8, 10, 15, 20 wt. (%), has been studied. SPE films of uniform thickness ~100-150 μm have been casted by hot-press technique. The conductivity dependent on salt concentration has been measured and SPE film: [85PEO: 15 Ag (ClO4)] has been identified as Optimum Conducting Composition (OCC) with room temperature conductivity (σ) ~ 5.64× 10 S/cm. The characterization of materials and ion transport properties in SPE OCC film have been done. In order to understand the ion transport mechanism, conductivity ( ), total ionic transference number (tion) and cation (Ag ) transport number (t+) have been determined using ac impedance, dc polarization and combined ac/dc techniques, respectively. The temperature dependent conductivity has also been measured to evaluate the activation energy (Ea) from the linear least square fitting of ‘log −1/T’ Arrhenius plot. All-sol...
Proceedings of the Bulgarian Academy of Sciences
PEO/SNCs based nanocomposite electrolyte membrane complexed with MgBr2 salt (15 wt.%) was fabricated following conventional solution casting technique. The effect of incorporation of salt ions on microstructural properties of host matrix of PEO/SNCs were investigated by means of XRD, FTIR, DSC studies. The modifications in the nature of diffraction peaks and vibrational modes of nanocomposites revealed the formation of strong hydrogen bonding and cross links between SNCs and salt ions. A decrease of melting and glass transition temperatures of host matrix was observed as a result of salt doping. The complex electrochemical impedance measurements were carried out in the applied frequency range of 0.1 Hz – 1 MHz and in the temperature range of 303–373 K. The PEO/SNCs composite complexed with 15 wt.% salt showed room temperature ionic conductivity of 7.8 × 10–8 S/cm promising for soft electronics, solid state ionics and sensing applications.
Ion transport property studies on PEO–PVP blended solid polymer electrolyte membranes
Journal of Physics D: Applied Physics, 2009
The ion transport property studies on Ag + ion conducting PEO-PVP blended solid polymer electrolyte (SPE) membranes, (1 − x)[90PEO : 10AgNO 3 ] : xPVP, where x = 0, 1, 2, 3, 5, 7, 10 (wt%), are reported. SPE films were caste using a novel hot-press technique instead of the traditional solution cast method. The conventional solid polymeric electrolyte (SPE) film, (90PEO : 10AgNO 3), also prepared by the hot-press method and identified as the highest conducting composition at room temperature on the basis of PEO-AgNO 3-salt concentration dependent conductivity studies, was used as the first-phase polymer electrolyte host into which PVP were dispersed as second-phase dispersoid. A twofold conductivity enhancement from that of the PEO host could be achieved at room temperature for PVP blended SPE film composition: 98(90PEO : 10AgNO 3) : 2PVP. This has been referred to as optimum conducting composition (OCC). The formation of SPE membranes and material characterizations were done with the help of the XRD and DSC techniques. The ion transport mechanism in this SPE OCC has been characterized with the help of basic ionic parameters, namely ionic conductivity (σ), ionic mobility (µ), mobile ion concentration (n) and ionic transference number (t ion). Solid-state polymeric batteries were fabricated using OCC as electrolyte and the cell-potential discharge characteristics were studied under different load conditions.
Advanced Materials Letters, 2012
Solid Polymer blend electrolytes based on Polyvinyl alcohol (PVA) and Polyethylene glycol (PEG) complex with Mg(CH 3 COO) 2 at different weight percent ratios were prepared using solution cast technique. Conductivity in the temperature range 303-373 K and transference number measurements have been employed to investigate the charge transport in this solid polymer electrolyte system. The highest conductivity is found to be 3.23 x 10-5 S/cm at 373K for sample with 30 weight percent of Mg(CH 3 COO) 2 in PVA/PEG blend matrix. Transport number data shows that the charge transport in this polymer electrolyte system is predominantly due to ions. Using this electrolyte, an electrochemical cell with configuration Mg /(PVA+PEG+Mg(CH 3 COO) 2)/ (I 2 +C+electrolyte) was fabricated and its discharge characteristics profile has been studied.
XRD, Conductivity studies on PVA-PEG blend based Mg2+ ion conducting polymer electrolytes
International Journal of Science and Engineering Applications, 2012
Poly vinyl alcohol (PVA) and polyethylene glycol (PEG) blend based Mg 2+ ion conducting polymer electrolytes have been prepared. Polyethylene glycol (PEG) with three different molecular weights 200,400 and 600 has been used and the effect of this molecular weight on the ionic onductivity of the electrolytes is studied through XRD, ac impedance technique. The analysis shows that the PEG with mol.wt 600 is more effective in reducing the crystallinity and enhancing the conductivity properties of the electrolytes.
Journal of Alloys and Compounds, 2019
Magnesium ion conducting nanocomposite polymer electrolytes with different wt% of MgO nano-filler in optimum conducting composition of solid polymer electrolyte have been prepared by solution cast technique and characterized by various electrical and thermal techniques. The thermal stability in polymer electrolyte films was confirmed by Thermogravimetric analysis (TGA), reduction in melting temperature was confirmed by Differential scanning calorimetry (DSC) and decrease in degree of crystallnity was confirmed by X-Ray Diffraction (XRD). It was found that dispersion of nano-filer enhances ionic conductivity and dielectric constant, confirmed by complex impedance spectroscopy (CIS). The impedance spectroscopy technique performed in the frequency range between 42Hz and 5MHz at different temperatures and obtain highest conductivity 1.04x10-4 S/cm for optimum conducting composition (OCC) i.e. 70 PVDF:30 Mg(NO 3) 2 :3MgO of NCPE thin film. The magnesium ion conduction in NCPE was confirmed by transference number measurement.
2015
Department of Physics, Thiagarajar College of Engineering, Madurai-625 015, Tamilnadu, India E-mail : ravi4xyz@gmail.com Department of Physics, Gandhigram Rural University, Dindigul-624 302, Tamilnadu, India Nano-sized <strong>MgO</strong> particles were synthesized through sol-gel method and dispersed as filler in <strong>PVC-PEG</strong> matrix with lithium perchlorate (<strong>LiClO<sub>4</sub></strong><sub> </sub>) as dopant salt. The content of <strong>MgO</strong> particles in the electrolyte was varied to study its influence on the ionic conductivity of the membranes. The electrolyte films were subjected to <strong>XRD</strong>, AC impedance analysis. The analysis reveals the strong influence of <strong>MgO</strong> particles on the conductivity profile. The conductivity of <strong>MgO</strong> doped electrolyte membranes exhibits two maxima one occurring at 1 wt% and o...
Research Journal of Pharmaceutical Biological and Chemical Sciences, 2014
Composite polymer electrolyte materials are very attractive for components of batteries and optoelectronic devices. PEG-Mg(NO 3) 2 polymer electrolytes and their composites were prepared by using addition of different wt. % of Al 2 O 3 ceramic fillers. Several experimental techniques, such as composition-dependence conductivity, temperature dependence conductivity in the temperature range of 303-333 K and transport number measurements, have been employed to characterize these polymer electrolytes. The magnitude of conductivity increased with increase in the concentration of the Al 2 O 3 ceramic filler and temperature. The highest ionic conductivity achieved was 3.4 x 10-5 S/cm for the sample prepared with 15 wt % of Al 2 O 3 at room temperature. The charge transport in the present composite polymer electrolytes is mainly due to ions. Using these (PEG-Mg(NO 3) 2) polymer electrolyte and (PEG-Mg(NO 3) 2-Al 2 O 3) composite polymer electrolyte, solid-state electrochemical cells were fabricated and their discharge profiles were studied.
Open Journal of Organic Polymer …, 2012
Polymer blend electrolytes, where PEO-PMMA polymer blend is used as polymer host matrix, doped with AgNO 3 and plasticized with ethylene carbonate (EC) and Al 2 O 3 as nano-filler were synthesized using the solution cast techniques. The polymer films were characterized by impedance spectroscopy, XRD, DSC, SEM, FT-IR and ionic transport measurements. The results indicate an enhancement in conductivity of PEO-PMMA-AgNO 3-EC polymer electrolytes. The ionic conductivity of the polymer films is also found to increase with temperature. Electrical properties of polymer films in the framework of dielectric and modulus formalism are studied and discussed.