Electrical, dielectric and electrochemical characterization of novel poly(acrylic acid)-based polymer electrolytes complexed with lithium tetrafluoroborate
“…Each is associated with ions conduction at high-frequencies and blocking effect at low-frequencies in bulk polymer electrolytes. 22 The interception points of extrapolated semicircle and tilted spike plots at real impedance determines the bulk resistance, Rb of the electrolyte. Then, the ionic conductivity of the samples was evaluated using the following expressionwhere t and A are the thickness of the electrolyte sample and electrode-electrolyte contact area, respectively.…”
Section: Resultsmentioning
confidence: 99%
“…This finding is consistent with the results from previous reports where the optimum ionic conductivity was obtained when 6 wt.% of LiTf was added into the biopolymer system. 22,23 Figure 3.Conductivity of GG-LiTf BPE for various salt concentration at room temperature.…”
Section: Resultsmentioning
confidence: 99%
“…This finding is consistent with the results from previous reports where the optimum ionic conductivity was obtained when 6 wt.% of LiTf was added into the biopolymer system. 22,23 To further evaluate the effect of the transport properties of the GG-LiTf samples, the diffusivity, mobility, and density of the electrolyte charge carrier were calculated using equations (2), (3), (4) and plotted as a function of salt concentration (wt.%) at room temperature, as shown in Figure 4. The values of the bulk resistance, conductivity, charge carrier concentration, mobility, and diffusivity of GG-LiTf biopolymer electrolyte at room temperature for various LiTf salt concentrations are tabulated in Table 2.…”
Section: Salt Concentration-conductivity Dependent At Room Temperaturementioning
Charge carrier density, mobility and diffusivity are three important transport properties in determining the ionic conductivity as well as the performance of solid polymer electrolyte. In this work, biopolymer electrolytes samples were prepared using the solution casting method by complexing gellan gum with different concentrations of lithium trifluoromethanesulfonate (3–15 wt.%). The values of charge carrier concentration, mobility, and diffusivity for electrolyte samples were estimated by fitting the Nyquist plot with an equation developed based on electrical impedance spectroscopy. At room temperature, the optimum electrolyte conductivity is 1.29×10−8 Scm−1 at 6 wt.% salt concentration. This result was supported by the highest percentage of free ions, 31.45%, observed in the FTIR method. As the temperature increases, the ionic conductivity increases to the optimum value before dropping. The highest conductivity of each sample was obtained at different temperatures (80°C–90°C) using the impedance method, whereas the percentage area of free ions was highest at 80°C for all samples with FTIR analysis. Overall, the ionic conductivity of this system has been dominated by the carrier charge density. Results suggest that, under these experimental conditions, electrical impedance spectroscopy is suitable for evaluating the charge transport properties at low temperatures.
“…Each is associated with ions conduction at high-frequencies and blocking effect at low-frequencies in bulk polymer electrolytes. 22 The interception points of extrapolated semicircle and tilted spike plots at real impedance determines the bulk resistance, Rb of the electrolyte. Then, the ionic conductivity of the samples was evaluated using the following expressionwhere t and A are the thickness of the electrolyte sample and electrode-electrolyte contact area, respectively.…”
Section: Resultsmentioning
confidence: 99%
“…This finding is consistent with the results from previous reports where the optimum ionic conductivity was obtained when 6 wt.% of LiTf was added into the biopolymer system. 22,23 Figure 3.Conductivity of GG-LiTf BPE for various salt concentration at room temperature.…”
Section: Resultsmentioning
confidence: 99%
“…This finding is consistent with the results from previous reports where the optimum ionic conductivity was obtained when 6 wt.% of LiTf was added into the biopolymer system. 22,23 To further evaluate the effect of the transport properties of the GG-LiTf samples, the diffusivity, mobility, and density of the electrolyte charge carrier were calculated using equations (2), (3), (4) and plotted as a function of salt concentration (wt.%) at room temperature, as shown in Figure 4. The values of the bulk resistance, conductivity, charge carrier concentration, mobility, and diffusivity of GG-LiTf biopolymer electrolyte at room temperature for various LiTf salt concentrations are tabulated in Table 2.…”
Section: Salt Concentration-conductivity Dependent At Room Temperaturementioning
Charge carrier density, mobility and diffusivity are three important transport properties in determining the ionic conductivity as well as the performance of solid polymer electrolyte. In this work, biopolymer electrolytes samples were prepared using the solution casting method by complexing gellan gum with different concentrations of lithium trifluoromethanesulfonate (3–15 wt.%). The values of charge carrier concentration, mobility, and diffusivity for electrolyte samples were estimated by fitting the Nyquist plot with an equation developed based on electrical impedance spectroscopy. At room temperature, the optimum electrolyte conductivity is 1.29×10−8 Scm−1 at 6 wt.% salt concentration. This result was supported by the highest percentage of free ions, 31.45%, observed in the FTIR method. As the temperature increases, the ionic conductivity increases to the optimum value before dropping. The highest conductivity of each sample was obtained at different temperatures (80°C–90°C) using the impedance method, whereas the percentage area of free ions was highest at 80°C for all samples with FTIR analysis. Overall, the ionic conductivity of this system has been dominated by the carrier charge density. Results suggest that, under these experimental conditions, electrical impedance spectroscopy is suitable for evaluating the charge transport properties at low temperatures.
“…5a, b, respectively. At high-frequency side, the dipoles are unable to orient themselves due to high periodic reversal of the field (Pritam and Sharma, 2019;Ngai et al 2018;Nath and Talukdar 2020). This results in lesser number of charge carriers contributing to the dielectric constant with the increase in frequency value.…”
In this paper, performance enhancement of magnesium ion conducting solid polymer electrolyte has been investigated with the incorporation of urea in it. The standard solution casting technique has been adopted to fabricate solid polymer electrolyte consisting of poly(ethylene oxide) (PEO) polymer, magnesium triflate (MgTf 2 ) salt and urea. Measurement on conductivity, dielectric and modulus is carried out on the electrolyte films as a function of frequency at various temperatures. On the introduction of urea in PEO/MgTf 2 matrix, the ionic conductivity improves by an order of magnitude and the relaxation time decreases from 0.45 to 0.16 µs. The highest conductivity of 6.3 × 10 -5 S cm −1 has been recorded for PEO/MgTf 2 /Urea polymer electrolyte system. The ionic conductivity versus temperature plots suggests the Arrhenius behavior within the electrolyte compositions. The number density of the free ions increases by an order of magnitude from 10 20 to 10 21 on the addition of urea in PEO/MgTf 2 matrix without any significant change in mobility values. The conductivity, dielectrics, surface morphology and X-ray diffraction studies reveal that urea is not only improving the porous structure but also interacting with the PEO/MgTf 2 matrix to improve the ion dynamics. This approach toward improved ion-transport behavior may be utilized in fabricating high-performance electrolytes, especially for magnesium batteries.
“…Modulus study Dielectric modulus is a study to approach the dielectric relaxation behavior by suppressing electrodes' polarization effect [25]. Figure 7 (a) and (b) shows the real and imaginary modulus of different CA concentrations at ambient temperature.…”
In the present study, a novel solid biopolymer electrolyte (SBE) system is introduced by doping citric acid into alginate polymer. A sample of the alginate-citric acid SBE system was prepared via a solution casting technique. Using electrical impedance spectroscopy (EIS), the electrolytes of alginate-citric acid analyzed from 5 Hz to 1 MHz achieved the highest conductivity at 20 wt.% of 5.49 × 10 -7 S cm -1 . The temperature dependence of various citric acid amounts obeyed the Arrhenius rule with R 2~1 , where all SBE systems were thermally activated with increasing temperature. The dielectric studies of the alginate-citric acid SBE system showed non-Debye behavior based on data measured using complex permittivity (ε*) and complex electrical modulus (M*) at selected temperature, where no single relation was found in the new biopolymer electrolyte system.
AbstractKarakterisasi Sifat-Sifat Listrik pada Alginat Berbasis Elektrolit Biopolimer Padat Baru yang Dimasukkan dengan Asam Sitrat. Di dalam studi kali ini, suatu sistem elektrolit biopolimer padat (SBE) baru telah diperkenalkan dengan mendoping asam sitrat ke dalam polimer alginat. Sampel sistem SBE alginat-asam sitrat dibuat melalui teknik pengecoran larutan. Dengan menggunakan Spektroskopi Impedansi Listrik (Electrical Impedance Spectroscopy (EIS)), elektrolit-elektrolit alginat-asam sitrat telah dianalisis dari 5 Hz sampai 1 MHz mencapai nilai konduktivitas tertinggi pada 20% berat sebesar 5,49 x 10-7 S cm-1. Ketergantungan temperatur berbagai komposisi asam sitrat terbukti mentaati aturan Arrhenius dengan R2~1 di mana semua sistem SBE diaktifkan secara termal ketika menaikkan temperatur. Studi-studi dielektrik tentang sistem SBE alginat-asam sitrat menunjukkan suatu perilaku non-debye berdasarkan pada data yang diukur dengan menggunakan permitivitas kompleks (ε*) dan modulus listrik kompleks (M*) pada temperatur yang dipilih di mana tidak ditemukan adanya hubungan tunggal di dalam sistem elektrolit biopolimer baru.
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