AC conductivity and relaxation behavior in ion conducting polymer nanocomposite

Sharma, Annu; Thakur, Awalendra K.

doi:10.1007/s11581-010-0502-6

Cited by 42 publications

(13 citation statements)

References 31 publications

(28 reference statements)

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“…The frequency dependence of the real part of AC conductivity (σ’) for PEO (600,000 g/mol)–LiCF 3 SO 3 /LiClO 4 (EO:Li + = 20)– x wt % MMT films has been reported [ 149 , 152 ]. The σ’ values of the MMT-filled CPEs were found higher than those without MMT, which was attributed to increased ion conduction paths resulting from the intercalated MMT structures [ 156 , 157 ]. All the σ’ spectra exhibit typically two linear slopes in the low and high frequency regions, respectively, due to the semi-crystalline PEO.…”

Section: Nanoparticle Additives Affect the Polymer Electrolyte Diementioning

confidence: 99%

Composite Polymer Electrolytes: Nanoparticles Affect Structure and Properties

2016

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Abstract:Composite polymer electrolytes (CPEs) can significantly improve the performance in electrochemical devices such as lithium-ion batteries. This review summarizes property/performance relationships in the case where nanoparticles are introduced to polymer electrolytes. It is the aim of this review to provide a knowledge network that elucidates the role of nano-additives in the CPEs. Central to the discussion is the impact on the CPE performance of properties such as crystalline/amorphous structure, dielectric behavior, and interactions within the CPE. The amorphous domains of semi-crystalline polymer facilitate the ion transport, while an enhanced mobility of polymer chains contributes to high ionic conductivity. Dielectric properties reflect the relaxation behavior of polymer chains as an important factor in ion conduction. Further, the dielectric constant (ε) determines the capability of the polymer to dissolve salt. The atom/ion/nanoparticle interactions within CPEs suggest ways to enhance the CPE conductivity by generating more free lithium ions. Certain properties can be improved simultaneously by nanoparticle addition in order to optimize the overall performance of the electrolyte. The effects of nano-additives on thermal and mechanical properties of CPEs are also presented in order to evaluate the electrolyte competence for lithium-ion battery applications.

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Section: Nanoparticle Additives Affect the Polymer Electrolyte Diementioning

confidence: 99%

Composite Polymer Electrolytes: Nanoparticles Affect Structure and Properties

2016

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“…It permits the transportation of ionic charge carriers as well as prevent electrical short circuits between the electrodes. So, various polymer materials have been studied and developed as SPE matrix [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Optimization of salt concentration and explanation of two peak percolation in blend solid polymer nanocomposite films

Arya

Sharma

2018

J Solid State Electrochem

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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.

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“…At frequencies high‐enough for the required activation energy, fast switching in the field direction generates reverse conditions for alignment of dipoles and causing dipoles‐accumulation due to lack of enough period of time for rotation/orientation while applying the field. The high value of the dielectric constant is an indication for the enhancement of ionic conductivity 28,29 . The loss dispersal at the high‐frequencies and high temperatures refers to the thermal vibrational activation in the composit material.…”

Section: Resultsmentioning

confidence: 99%

“…The high value of the dielectric constant is an indication for the enhancement of ionic conductivity. 28,29 The loss dispersal at the high-frequencies and high temperatures refers to the thermal vibrational activation in the composit material. Besides that, no enough period of time for the composite material to synchronize its interactive response with the applied electric field.…”

Section: Dielectric Relaxationmentioning

confidence: 99%

Studies of composite films of polyethylene oxide doped with potassium hexachloroplatinate

Al-Akhras

Alzoubi

Ababneh

et al. 2020

J of Applied Polymer Sci

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The permittivity and conductivity relaxation processes of polyethylene oxide (PEO) composite along with potassium hexachloroplatinate (K 2 PtCl 6) electrolytes additive forming PEO/K 2 PtCl 6 complex composite have been investigated. The complex composite has been used as a model for dry-polymer electrolytes (PEs) due to the fact that, the anion is large enough for mimicking the immobilized anion in real dry-polymer electrolytes. Stand-free composite films with 0%, 1%, 3%, and 5% concentrations of K 2 PtCl 6 have been studied using broadband dielectric spectroscopy in the temperatures range from 150 K until 345 K. The microstructural dynamics revealed the α-, β-, and σ-relaxations and their salient spectral characteristics at various concentrations of K 2 PtCl 6 in PEO. The experimental ε" master curves were fitted to HN function for one and/or two relaxation peaks with and without the electrical conductivity contribution in order to investigate the relaxation time (τ), dielectric strengths (Δε), modulus formalism (M") and the electrical conductivitie (σ). The translational and reorientational degrees of freedom of PEO/K 2 PtCl 6 complex composites are responsible for the relaxation behavior which is predicted to be correlated to the relaxation behavior of the polymer electrolyte below and above the glass transition temperature (T g). The relaxation time (τ) deduced from β-relaxation follows Arrhenius-like behavior while that deduced from α-relaxation process follows Vogel-Tamman-Fulcher (VTF) behavior.

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AC conductivity and relaxation behavior in ion conducting polymer nanocomposite

Cited by 42 publications

References 31 publications

Composite Polymer Electrolytes: Nanoparticles Affect Structure and Properties

Composite Polymer Electrolytes: Nanoparticles Affect Structure and Properties

Optimization of salt concentration and explanation of two peak percolation in blend solid polymer nanocomposite films

Studies of composite films of polyethylene oxide doped with potassium hexachloroplatinate

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