Ionic tracer diffusion and dc conductivity in the polymer electrolyte PEONaI

Obeidi, Sh.; Zazoum, Bouchaib; Stolwijk, N. A.

doi:10.1016/j.ssi.2004.07.055

Cited by 21 publications

(43 citation statements)

References 7 publications

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“…First, the increase of k p PEO 60 NaI, i.e., towards values greater than unity at high temperatures, is steeper than for PEO 20 NaI. Second, according to the definition of the pair fraction, r p r 1 must hold, which is warranted by the use of eqn (8). Thus for high k p values, the difference with r p becomes quite large.…”

Section: Enthalpy and Entropy Of Ion Pairingmentioning

confidence: 94%

“…More details can be found in previous publications. 5,8 PEO with a molecular weight of 8 Â 10 6 (98.4%, 9 Aldrich) and NaI (99%, Gru¨ssing) were dried under dynamic vacuum of 10 À3 Pa at temperatures of 50 and 100 1C, respectively. Proper amounts of both components, adjusted to O-to-Na ratios y = 20 or 60, were dissolved in dry acetonitrile.…”

Section: Methodsmentioning

confidence: 99%

“…Specifically, s dc was taken at the frequency value for which the phase angle was closest to 01. 8 The dc conductivity was converted into the charge diffusivity D s with the aid of the Nernst-Einstein equation, i.e.,…”

Section: Conductivity Datamentioning

confidence: 99%

“…The theoretical framework for the joint evaluation of diffusion and conductivity data was initially developed for PEO 30 NaI 4,8 and also successfully applied to a cross- Table 1. Fig. 5 Comparison of the charge diffusivity D s among three different compositions of the PEO-NaI electrolyte system.…”

Section: Modelling Of Ionic Transportmentioning

confidence: 99%

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Mass and charge transport in the PEO–NaI polymer electrolyte system: effects of temperature and salt concentration

2007

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Ionic transport in amorphous complexes of poly(ethylene oxide) (PEO) and sodium iodide (NaI) was investigated by means of radiotracer diffusion and electrical conductivity measurements for three different compositions characterised by O-to-Na ratios of 20, 30, and 60. The diffusivity of 22Na and 125I as well as the charge diffusivity each show a systematic dependence on both temperature and salt concentration. The experimental data can be described within a transport model based on the occurrence of neutral ion pairs in addition to charged single cations and anions. It is found that both the enthalpy and entropy of ion pair formation decrease with increasing salt concentration. This indicates that the state of coordination between cations and polymer chain segments correlates with the number of available oxygen atoms per cation.

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Section: Enthalpy and Entropy Of Ion Pairingmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Conductivity Datamentioning

confidence: 99%

Section: Modelling Of Ionic Transportmentioning

confidence: 99%

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Mass and charge transport in the PEO–NaI polymer electrolyte system: effects of temperature and salt concentration

2007

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“…Using a high resolution solid state 13 C NMR, Zhang et al (1992) measured the amorphous phase size in polymer can ranged from 2-30nm (Zhang et al, 1992). From these reports, it is acceptable to assume ξ values range from 0.01-0.1 µ m. The diffusions coefficient of ions in polymer is around 10 −7 cm 2 s −1 (Klimuk and Kuczajowska-Zadrozna, 2002;Stolwijk and Obeidi, 2004;Obeidi et al, 2004;Bracht et al, 1991). Hirankumar et al (2006) reported that the relaxation time in polymer is around 10 −5 s (Hirankumar et al, 2006).…”

Section: Methodsmentioning

confidence: 99%

A General Formula for Ion Concentration-Dependent Electrical Conductivities in Polymer Electrolytes

Aji¹

2012

American Journal of Applied Sciences

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Problem statement:The aim of this study is to develop a model for describing the effect of ion concentration on the electrical conductivity of polymer electrolytes by considering two mechanisms simultaneously: Enhancements of ion concentration and amorphous phase. Approach: The problems based on new observations in polymer electrolyte when ion concentration in the polymer electrolytes was increased, both the fraction of amorphous phase and the charge carriers increase simultaneously. The model was based on the assumption when ions were inserted into the polymer host, there was an optimum distance between ions at which the ions move easily throughout the polymer. The average distance between ions in the polymer depends on the ion concentration. And we also considered the effect of ion concentration on the amorphous phase in the polymer. Results: We inspected the validity of the model by comparing the model predictions with various experimental data. The new analytical expressions for the electrical conductivity dependent of ion concentration was developed by considering two mechanisms simultaneously in polymer electrolytes, i.e., enhancement of the carries concentration and amorphous phase fraction. Interestingly, most of fitting parameters were not arbitrarily selected, but were derived from the appropriate experimental data. Conclusion: The model can be used to explain the conductivity behavior of other polymer electrolyte systems by selecting appropriately less number of parameters. This model result is fully supported by available experimental data.

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Ion dynamics in NaBF4 salt-complexed PVC–PEO blend polymer electrolytes: correlation between average ion hopping length and network structure

Roy

Dutta²,

Bhattacharya

2017

Ionics

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Ionic tracer diffusion and dc conductivity in the polymer electrolyte PEONaI

Cited by 21 publications

References 7 publications

Mass and charge transport in the PEO–NaI polymer electrolyte system: effects of temperature and salt concentration

Mass and charge transport in the PEO–NaI polymer electrolyte system: effects of temperature and salt concentration

A General Formula for Ion Concentration-Dependent Electrical Conductivities in Polymer Electrolytes

Ion dynamics in NaBF4 salt-complexed PVC–PEO blend polymer electrolytes: correlation between average ion hopping length and network structure

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