Thermal and dielectric studies of polymer electrolyte based on P(ECH-EO)

Nithya, H.; Selvasekarapandian, S.; Kumar, Deepak; Sakunthala, A.; Hema, M.; Christopherselvin, P.; Kawamura, Junichi; Baskaran, R.; Sanjeeviraja, C.

doi:10.1016/j.matchemphys.2010.10.047

Cited by 77 publications

(28 citation statements)

References 42 publications

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“…With increasing frequency, there was no time for the buildup of charges at the interface, but only for the buildup of charges at the boundaries of conducting species in the material and at the ends of conducting paths. This phenomenon led to the so-called conductivity relaxation [28].…”

Section: Resultsmentioning

confidence: 99%

Li+ ion conduction mechanism in poly (ε-caprolactone)-based polymer electrolyte

Aziz

2013

Iran Polym J

146

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In this work, solid polymer electrolytes based on poly(e-caprolactone) (PCL) with lithium bis(oxalato)borate as a doping salt were prepared by solution cast technique using DMF as a solvent. The electrical DC conductivity and dielectric constant of the solid polymer electrolyte samples were investigated by electrochemical impedance spectroscopy over a frequency range from 50 Hz to 1 MHz. It was found that the DC conductivity increased with increase in the salt concentration to up to 4 wt% and thereafter decreased. Dielectric constant versus salt concentration was used to interpret the decrease in DC conductivity with increase in salt concentration. The DC conductivity as a function of temperature follows Arrhenius behavior in low temperature region, which reveals that ion conduction occurs through successful hopping. The curvature of DC conductivity at high temperatures indicates the contribution of segmental motion to ion conduction. High values for dielectric constant and dielectric loss were observed at low frequencies. The plateau of dielectric constant and dielectric loss at high frequencies can be observed as a result of rapid oscillation of the AC electric field. The HN dielectric function was utilized to study the dielectric relaxation. The experimental and theoretical data of dielectric constant are very close to each other at low temperatures. At high temperatures, the simulated data are more deviated from the experimental curve of dielectric constant due to the dominance of electrode polarization. The non-unity of relaxation parameters (a and b) reveals that the relaxation processes in PCL-based solid electrolyte is a non-Debye type of relaxation.

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Section: Resultsmentioning

confidence: 99%

Li+ ion conduction mechanism in poly (ε-caprolactone)-based polymer electrolyte

Aziz

2013

Iran Polym J

146

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“…11a, b. At lower frequencies, the real and imaginary parts of the modulus approaches zero, indicating that the electrode polarization phenomenon makes a negligible contribution; the long tail that appears is due to the large capacitance associated with the electrodes [51]. The presence of a peak in the imaginary modulus formalism at higher frequency indicates that ionic conduction is predominant in the structure of the studied polysulfone.…”

Section: Electrical Modulus Analysismentioning

confidence: 90%

Electrical conductivity and optical properties of a new quaternized polysulfone

Buruiana¹,

Avram²,

Popa

et al. 2011

Polym. Bull.

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Quaternized polysulfone with triphenylphosphonium pendant groups was investigated, as to its optical and electronic properties. Optical properties were analyzed by refractivity and transmission spectra. To obtain the optical parameters, the approach proposed by Tauc for amorphous semiconductors has been used, because of the similarity of the absorption edges. Values of pseudogap energy and Urbach energy of 3.89 eV and 168 meV, respectively, were obtained. The dielectric properties and AC-conductivity were also studied as a function of temperature and frequency. Decrease in the dielectric constant was observed with the increase in frequency and decrease in temperature. Also, quaternized polysulfone films were characterized by two relaxation processes, c and b relaxation, which appear at different temperatures, depending on the pendant group. The frequency-temperaturedependent conductivity showed that conductivity increases with frequency and also that the quaternized polysulfones possess typical semiconducting properties. All parameters have been found as slightly influenced by the polymer chain structure.

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“…5. The two factors that involved in the increase of T g with the salt content are the rise in microviscosity of the solid electrolyte film and the stiffening of the polymer chains [31] due to the strong ion-dipole interactions between H + ions and oxygen atoms present in more than one coordinate sites i.e. the C=O polar groups of both PVAc and PMMA as shown in Fig.…”

Section: Dsc Analysismentioning

confidence: 99%

Characterization of high ionic conducting PVAc–PMMA blend-based polymer electrolyte for electrochemical applications

Chandra

Karthikeyan²,

Selvasekarapandian

et al. 2016

Ionics

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A solid polymer blend electrolyte is prepared using poly(vinyl acetate) (PVAc) and poly(methyl methacrylate) (PMMA) polymers with different molecular weight percentage (wt%) of ammonium thiocyanate (NH 4 SCN) by solution casting technique with tetrahydrofuran (THF) as a solvent. The structural, morphological, vibrational, thermal and electrical properties of the prepared polymer blend electrolytes have been studied. The incorporation of NH 4 SCN into the polymeric matrix causes decrease in the degree of crystallinity of the samples. The complex formation between the polymer and salt has been confirmed by FTIR technique. The increase in T g with increase in salt concentration has been investigated. The maximum conductivity of 3.684 × 10 −3 S cm −1 has been observed for the composition of 70PVAc/30PMMA/30 wt% of NH 4 SCN at 303 K. This value of ionic conductivity is five orders of magnitude greater than that of 70PVAc/30PMMA polymer membrane. Dielectric and transport studies have been done. The highest conducting polymer electrolyte is used to fabricate proton battery with the configuration Zn/ZnSO 4 · 7H 2 O (anode) ||polymer electrolyte||PbO 2 /V 2 O 5 (cathode). The open circuit voltage of the fabricated battery is 1.83 V, and its performance has been studied.

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Thermal and dielectric studies of polymer electrolyte based on P(ECH-EO)

Cited by 77 publications

References 42 publications

Li+ ion conduction mechanism in poly (ε-caprolactone)-based polymer electrolyte

Li+ ion conduction mechanism in poly (ε-caprolactone)-based polymer electrolyte

Electrical conductivity and optical properties of a new quaternized polysulfone

Characterization of high ionic conducting PVAc–PMMA blend-based polymer electrolyte for electrochemical applications

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