Ionic conductivity and diffusion coefficients of lithium salt polymer electrolytes measured with dielectric spectroscopy

Munar, A.; Andrio, Andreu; Iserte, Rosa; Compañ, Vicente

doi:10.1016/j.jnoncrysol.2011.04.012

Cited by 73 publications

(63 citation statements)

References 14 publications

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“…In this regard, conductivities reported at room temperature for bulk ILs can be up to two orders of magnitude higher than those obtained in our composites. Thus, for BMIM [NTf 2 ] a value of 3.9 10 -3 S cm -1 has been reported[39], and a value of 0 25. 10 -3 S cm -1 has been calculated for BMIM [Cl] at 40 ºC.…”

mentioning

confidence: 99%

Conductive films based on composite polymers containing ionic liquids absorbed on crosslinked polymeric ionic-like liquids (SILLPs)

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Compañ

Andrio

et al. 2015

Polymer

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Registro de acceso restringido Este recurso no está disponible en acceso abierto por política de la editorial. No obstante, se puede acceder al texto completo desde la Universitat Jaume I o si el usuario cuenta con suscripción. Registre d'accés restringit Aquest recurs no està disponible en accés obert per política de l'editorial. No obstant això, es pot accedir al text complet des de la Universitat Jaume I o si l'usuari compta amb subscripció. Restricted access item This item isn't open access because of publisher's policy. The full--text version is only available from Jaume I University or if the user has a running suscription to the publisher's contents.

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mentioning

confidence: 99%

Conductive films based on composite polymers containing ionic liquids absorbed on crosslinked polymeric ionic-like liquids (SILLPs)

Altava

Compañ

Andrio

et al. 2015

Polymer

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“…As it can be seen, in the case of τ s τ q the frequency of the arg{z} maximum coincides with the frequency of z minimum and is defined by ω qs [Eq. (31)], at which the bulk and the surface contributions are nearly equal. The maximum value arg{z} max ≈ arctan(−2 τ q /τ s ) will be larger for the larger values of the concentration of the charge carriers and the distance between electrodes, and smaller for the smaller effective thickness of the dielectric layer [see Eq.…”

Section: Analysis Of the Impedance Frequency Dependencementioning

confidence: 99%

“…Such approach was based on works [21-23, 28, 29] and developed in Refs. [30,31]. In particular, it was shown [30], that the diffusion coefficient can be directly calculated using the value and position of the dielectric loss tangent maximum.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, it was shown [30], that the diffusion coefficient can be directly calculated using the value and position of the dielectric loss tangent maximum. The method was successfully applied to different kind of ionic conductors -polymer films [23], polymer electrolyte [30,31], ionic liquids [12]. However, in some cases, the estimates of the ion parameters essentially deviate from those obtained by stoichiometric calculations of the total ion concentration or determined by other experimental methods.…”

Section: Introductionmentioning

confidence: 99%

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Influence of dielectric layers on estimates of diffusion coefficients and concentrations of ions from impedance spectroscopy

Khazimullin

Lebedev

2019

Phys. Rev. E

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We present the analysis of the impedance spectra for a binary electrolyte confined between blocking electrodes with dielectric layers. An expression for the impedance is derived from Poisson-Nernst-Planck equations in the linear approximation taking into account the voltage drop on the dielectric layer. The analysis shows, that characteristic features of the frequency dependence of the impedance are determined by the ratio of the Debay length and the effective thickness of the dielectric layer. The impact of the dielectric layer is especially strong in the case of high concentrated electrolytes, where the Debay length is small and thus comparable to the effective thickness of the dielectric layer. To verify the model, measurements of the impedance spectra and transient currents in a liquid crystal 4-n-pentyl-4'-cyanobiphenyl (5CB) confined between polymercoated electrodes in cells of different thicknesses are performed. The estimates for the diffusion coefficient and ion concentration in 5CB obtained from the analysis of the impedance spectra and the transient currents are consistent and agree with previously reported data. We demonstrate that calculations of the ion parameters from the impedance spectra without taking into account the dielectric layer contribution lead in most cases to incorrect results. Application of the model to analyze violations of the low-frequency impedance scaling and contradictions in the estimates of the ion parameters recently found in some ionic electrolytes are discussed. * maxim@anrb.ru arXiv:1804.04843v1 [cond-mat.soft]

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“…They can be obtained from dielectric spectra. The ion diffusivity is calculated from tan δ vs. log ω curve [17][18][19] using the following relation:…”

Section: Analysis Techniquesmentioning

confidence: 99%

Ion dynamics and relaxation behavior of NaPF6-doped polymer electrolyte systems

Srivastava

Kumar

2016

J Solid State Electrochem

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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 number of charge carriers (N′) estimated from conductivity data do not represent the real charge concentration in the system. Within the experimental frequency (∼MHz) range, three different regions are identified in ∂logσ vs. ∂logω curves namely (i) dc conductivity/free hopping, (ii) correlated ion hopping, and (iii) caged movement of ions. In the present case, also a scaled master conductivity curve is obtained by estimating the σ 0 and ω p (exclusively in Jonscher Power Law or JPL region) according to our previously proposed method. Scaling is realized with respect to salt concentration and temperature, which is an indication that salt concentration and temperature are only governing the number of charge carriers and mobility without affecting the underlying ion transport mechanism. NonDebye-type relaxation phenomenon is indicated by KWW exponent β (<1). Relaxation times, obtained from tanδ vs. logω curves, inversely follow the conductivity, indicating strongly correlated ion-polymer segmental motions.

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Ionic conductivity and diffusion coefficients of lithium salt polymer electrolytes measured with dielectric spectroscopy

Cited by 73 publications

References 14 publications

Conductive films based on composite polymers containing ionic liquids absorbed on crosslinked polymeric ionic-like liquids (SILLPs)

Conductive films based on composite polymers containing ionic liquids absorbed on crosslinked polymeric ionic-like liquids (SILLPs)

Influence of dielectric layers on estimates of diffusion coefficients and concentrations of ions from impedance spectroscopy

Ion dynamics and relaxation behavior of NaPF6-doped polymer electrolyte systems

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