Conductivity enhancement in polymer electrolytes on gamma irradiation

Nanda, Pradyot; Maity, Sankar; Pandey, Namita; Ray, Rajat; Thakur, Awalendra K.; Tarafdar, Sujata

doi:10.1016/j.radphyschem.2010.09.003

Cited by 18 publications

(6 citation statements)

References 21 publications

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“…However, the main drawback associated with a PEO is its low ionic conductivity at room temperature due to its highly crystalline nature, which is inadequate for most of the practical applications. In order to overcome this hindrance, it should be essential to increase amorphous region for enhancing the ionic conductivity at room temperature; attempts have been made with chemical methods and radiation processing to achieve the target [8][9][10][11]. The charge transport in the amorphous region is 2 to 3 orders of magnitude faster than in the crystalline region, there is a tendency to prepare polymer films with higher content of amorphous phase to improving polymer properties [12].…”

Section: Introductionmentioning

confidence: 99%

The physical and chemical properties of gamma ray irradiated polymer electrolyte films

Raghu

Archana

Chapi

et al. 2015

Journal of Non-Crystalline Solids

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Section: Introductionmentioning

confidence: 99%

The physical and chemical properties of gamma ray irradiated polymer electrolyte films

Raghu

Archana

Chapi

et al. 2015

Journal of Non-Crystalline Solids

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“…This results in the formation of smaller chain segments which in turn reduces the crystalline phase of the blend matrix and increases the amorphicity (also observed from the DSC results). The improvement in the amorphous phase makes the system flexible and favors the easy mobility of chain segments and charge carriers (ions) through the matrix, thus, leading to conductivity enhancement upon irradiation [1,[6][7][8].…”

Section: Resultsmentioning

confidence: 99%

“…However, most of these electrolytes show low values of ionic conductivity at ambient temperatures. Hence, various measures have been implemented in order to resolve this problem which include blending of polymers, plasticization by EC, PC, PEG etc., incorporation of nano fillers like Al 2 O 3 , SiO 2 , TiO 2 , etc and irradiation wherein, when the polymer electrolytes are exposed to the radiations, the polymer chains either scission or crosslink, thus improving electrical conductivity of these electrolytes [1]. In the view of this discussion, a PVA-PEO-EC-LiCF 3 SO 3 blend system is prepared by doping 3 to 11 wt% of LiCF 3 SO 3 salt.…”

Section: Introductionmentioning

confidence: 99%

Conductivity enhancement in PVA−PEO−EC−LiCF−3SO3 blends upon swift heavy O7+ ion irradiation

Joge¹,

Kanchan²,

Sharma³

et al. 2014

AIP Conference Proceedings

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In the present study, the PVA-PEO-EC-LiCF 3 SO 3 blend system was prepared using solution cast technique. The system was prepared by taking 5 different concentrations LiCF 3 SO 3 in the range of 3wt% to 11 wt%, at a fixed proportion of the rest of the constituents. These blend films had been exposed to O 7+ radiations of 80 MeV at a current of 1pnA at a fluence of 1x10 12 ions/cm 2 . The conductivity variation of the specimens is investigated using impedance spectroscopy wherein; the conductivity enhances drastically upon irradiation at all the concentrations of salt. The thermal characteristics of the blend films are being studied using Differential Scanning Calorimetry.

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“…Those study focused on microstructural variation as well as ionic conductivity alteration in the SPE by Gamma irradiation [4,5,7,9,[49][50][51][52][53][54].…”

Section: Effect Of Soluble Salt On Ionic Conductivity and Relaxation ...mentioning

confidence: 99%

Enhancement of Salt Solubility in a Solid Blend Polymer Electrolyte by Gamma Irradiation: Effects on Ion Dynamics and Relaxation Properties

Patla,

Ray,

Kandasami

et al. 2024

Preprint

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The blend of solid polymer electrolyte (SPE) has drawn tremendous attention due to its potential for applications in energy devices. In the present study, SPE was fabricated from a mixture of poly(vinylidene fluoride) (PVDF) and poly(ethylene oxide) (PEO) polymers at a 4:1 weight ratio with 0.02M KBr salt. Salt does not dissociate in this blend SPE. The poor ionic conductivity and low salt solubility in PVDF-rich blend SPE have been circumvented by irradiating a high-energy gamma irradiation dose from 0 to 150 kGy on the sample. In this study, we have systematically investigated the effect of gamma irradiation on salt aggregation and ion dynamics. Besides gamma irradiation, an ion beam (Oxygen Ion Beam O7+) was also used to irradiate and compared with the results obtained from gamma irradiation. Interestingly, dc conductivity shows oscillatory behaviour with a maximum at a 100 kGy irradiation dose. Ionic conductivity and relaxation behaviour of gamma-irradiated SPE have been investigated by impedance spectroscopy for a wide range of temperatures and frequencies. We use the equivalent circuit model to fit the Nyquist plot of different SPEs that gives the bulk resistance, constant phase element, and Warburg impedance of the SPEs. Models such as the Universal Power Law model (Almond and West model), the Poisson-Nernst-Planck (PNP) model, Havrilliak-Nigami (HN), and Kohlrausch-Williams-Watts (KWW) were employed to explore ion dynamics from ac conductivity spectra and modulus spectra. The temperature-dependent dc conductivity and relaxation time followed the Arrhenius relation obtained from the above analysis. The activation energy of conduction ions for different gamma-irradiated SPEs was obtained from the temperature-dependent dc conductivity, hopping frequency, and relaxation times (HN and KWW). The ac conductivity and modulus spectra were scaled by a universal scaling relation, which confirms the superposition of the time-temperature principle and follows the common ion conduction mechanism in the SPEs at different temperatures.

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Conductivity enhancement in polymer electrolytes on gamma irradiation

Cited by 18 publications

References 21 publications

The physical and chemical properties of gamma ray irradiated polymer electrolyte films

The physical and chemical properties of gamma ray irradiated polymer electrolyte films

Conductivity enhancement in PVA−PEO−EC−LiCF−3SO3 blends upon swift heavy O7+ ion irradiation

Enhancement of Salt Solubility in a Solid Blend Polymer Electrolyte by Gamma Irradiation: Effects on Ion Dynamics and Relaxation Properties

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