Abstract:The present paper discusses the ion dynamics of a novel polymeric system prepared by doping of NaPF 6 in a labprepared polymer matrix. Ion dynamics of the system is analyzed by presenting the impedance data in different formalisms. Mobility (and hence the conductivity) continuously increases with salt concentration, and the phenomenon is correlated with salt's plasticization nature, which is reconfirmed by the shifting of minima in ∂logε′/∂logω vs. logω curve towards high frequency. It has been observed that n… Show more
“…In most of the oxygen conducting electrolytes for in-stance, the presence of vacancies is generally known to dope the system and increase its electronic conductivity, which is detrimental to due to possible screening from the electrons or holes. Recent results on a polymer-based solid electrolyte report a very high dielectric constant [24], which could be explained by the above proposed mechanism, although no hysteretic behavior is reported to our knowledge. On the other hand some titanium-based perovskites have been reported to be good oxygen conductors [25].…”
Section: Colossal Permittivity Due To Ionic Motionmentioning
Electrical conductivity and high dielectric constant are in principle self-excluding, which makes the terms insulator and dielectric usually synonymous. This is certainly true when the electrical carriers are electrons, but not necessarily in a material where ions are extremely mobile, electronic conduction is negligible and the charge transfer at the interface is immaterial. Here we demonstrate in a perovskite-derived structure containing five-coordinated Ti atoms, a colossal dielectric constant (up to 10 9 ) together with very high ionic conduction 10 −3 S.cm −1 at room temperature. Coupled investigations of I-V and dielectric constant behavior allow to demonstrate that, due to ion migration and accumulation, this material behaves like a giant dipole, exhibiting colossal electrical polarization (of the order of 0.1 C.cm −2 ). Therefore, it may be considered as a "ferro-ionet" and is extremely promising in terms of applications.
“…In most of the oxygen conducting electrolytes for in-stance, the presence of vacancies is generally known to dope the system and increase its electronic conductivity, which is detrimental to due to possible screening from the electrons or holes. Recent results on a polymer-based solid electrolyte report a very high dielectric constant [24], which could be explained by the above proposed mechanism, although no hysteretic behavior is reported to our knowledge. On the other hand some titanium-based perovskites have been reported to be good oxygen conductors [25].…”
Section: Colossal Permittivity Due To Ionic Motionmentioning
Electrical conductivity and high dielectric constant are in principle self-excluding, which makes the terms insulator and dielectric usually synonymous. This is certainly true when the electrical carriers are electrons, but not necessarily in a material where ions are extremely mobile, electronic conduction is negligible and the charge transfer at the interface is immaterial. Here we demonstrate in a perovskite-derived structure containing five-coordinated Ti atoms, a colossal dielectric constant (up to 10 9 ) together with very high ionic conduction 10 −3 S.cm −1 at room temperature. Coupled investigations of I-V and dielectric constant behavior allow to demonstrate that, due to ion migration and accumulation, this material behaves like a giant dipole, exhibiting colossal electrical polarization (of the order of 0.1 C.cm −2 ). Therefore, it may be considered as a "ferro-ionet" and is extremely promising in terms of applications.
“…Due to the increasing global demand for energy, SIB research boosted itself due to the abundance (6 th most abundant element in earth crust, 2.64 %), readily accessible in both earthcrust/ocean, high reduction potential (-2.7 V), low toxicity, low cost (seven times lower than lithium, softness and atomic mass). To meet the global demand for energy, now research is focused on the development of sodium ion based devices due to the uniform geographical distribution of sodium [4][5][6][7][8][9][10][11][12].…”
The present paper report is focused toward the preparation of the flexible and freestanding blend solid polymer electrolyte films based on PEO-PVP complexed with NaPF6 by solution cast technique. The structural/morphological features of the synthesized polymer nanocomposite films have been investigated in detail using X-ray diffraction, Fourier transform infra-red spectroscopy, field emission scanning electron microscope, and atomic force microscopy techniques. The film PEO-PVP+NaPF6 (Ö/Na + = 8) exhibits highest ionic conductivity ~5.92×10 -6 S cm -1 at 40 °C and ~2.46×10 -4 S cm -1 at 100 °C. The temperature dependent conductivity shows Arrhenius type behavior and activation energy decreases with the addition of salt. The high temperature (100 °C) conductivity monitoring is done for the optimized PEO-PVP+NaPF6 (Ö/Na + =8) highly conductive system and the conductivity is still maintained stable up to 160 h (approx. 7 days). The thermal transitions parameters were measured by the differential scanning calorimetry (DSC) measurements. The prepared polymer electrolyte film displays the smoother surface in addition of salt and a thermal stability up to 300 o C. The ion transference number (tion) for the highest conducting sample is found to be 0.997 and evidence that the present system is ion dominating with negligible electron contribution. Both linear sweep voltammetry and cyclic voltammetry supports the use of prepared polymer electrolyte with long-term cycle stability and thermal stability for the solid state sodium ion batteries. Finally, a two peak percolation mechanism has been proposed on the basis of experimental findings.
“…Ions in NaCl association with the corresponding functional groups of pectin and hence diminish the crystallization in the other hand to raise the amorphous phase of the polymer matrix. 27 Figure 3.Deconvolution results of crystalline XRD peaks of (a) 100 wt.% Pectin SPE, (b) 1 wt.%, (c) 2 wt.%, (d) 3 wt.% and (e) 4 wt.% NaCl added Pectin/NaCl SPEs.Figure 4.Deconvoluted crystalline XRD peak of prepared SPEs at 2θ = 13.5°.…”
Section: Resultsmentioning
confidence: 99%
“…Ions in NaCl association with the corresponding functional groups of pectin and hence diminish the crystallization in the other hand to raise the amorphous phase of the polymer matrix. 27…”
Biopolymer pectin based polymer electrolytes with sodium chloride (NaCl) were prepared by solution casting method. Semi crystalline nature of pectin is reduced to reach the amorphous nature by addition of NaCl salt,investigated by X-ray diffraction analysis and XRD deconvolution technique. Investigation of FTIR and FTIR deconvolution exposed the occurrence of complexation and increment of free ion by addition of NaCl. The shifting of UV absorbance band of pectin demonstrates the optical properties of the prepared polymer electrolytes. Optical bandgap of pectin polymer electrolyte was decreased from 3.13 eV to 2.98 eV due to the electrons transition from valence band to conduction band. The measurements of dielectric constants were conceded out on these films in the frequency range 42–106 Hz from 303K to 373 K. From all these characterisation, 3 wt.% of NaCl doped polymer-salt complex system performed well.
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