Broad band dielectric behaviour of plasticized PEO-based solid polymer electrolytes

Bandara, L.R.A.K.; Dissanayake, M.A.K.L.; Furlani, Maurizio; Mellander, Bengt-Erik

doi:10.1007/bf02374073

Cited by 15 publications

(11 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We also observed another relaxation peak in the Li-containing polymers. In previous works on similar systems [17,18], this second peak has been interpreted as a relaxation due to ion pair dipoles, consisting of a positive cation and a negative anion. A similar peak was found in poly(propylene oxide)/LiClO 4 electrolytes by Furukawa et al…”

Section: Discussionmentioning

confidence: 91%

“…To this end we carry out a thorough analysis of a dielectric loss peak at frequencies slightly above the onset of the ionic conductivity response. This relaxation occurs only in the salt-containing polymers and has previously been assigned to ion pair dipoles [17,18]. In section 2 below the experimental procedures are described, while section 3 presents our results, followed by a discussion in section 4.…”

Section: Introductionmentioning

confidence: 86%

See 1 more Smart Citation

Concentration dependence of ionic relaxation in lithium doped polymer electrolytes

Furlani

Stappen

Mellander

et al. 2010

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

This is an author produced version of a paper published in Journal of NonCrystalline Solids. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. AbstractA detailed impedance spectroscopy study at ambient temperature was carried out on polymer electrolytes based on low molecular weight poly(ethylene oxide) 400, poly(propylene oxide) 400 and a random copolymer of molecular weight 600, to which were added LiN(CF 3 SO 2 ) 2 (LiTFSI) salt. The ionic conductivity exhibits a maximum at intermediate salt concentrations and is significantly higher for poly(ethylene oxide) and the copolymer. A dielectric relaxation was found in a frequency region above the one, where the ion conductivity dominates the dielectric response, and below the region of the relaxations of the polymer host. The relaxation strength scales with ion concentration, as appropriate for an ion pair relaxation in systems above the glass transition. The frequency of this relaxation, multiplied by the relaxation strength, has been found to be proportional to the ion conductivity, and the relaxation has therefore been assigned to short-range ion pair motion in the polymer. It exhibits characteristics similar to conductivity relaxations in inorganic solid ion conductors, and is considered to be due to the same species that give rise to the ion conductivity.

show abstract

Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 86%

Concentration dependence of ionic relaxation in lithium doped polymer electrolytes

Furlani

Stappen

Mellander

et al. 2010

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

show abstract

“…The Arrhenius equation is also commonly used to describe the ionic conductivity in crystalline polymers [39,40]: sans-serifσ=σ0expfalse(−Ea/kTfalse)…”

Section: Ion Transport In Binary and Composite Polymer Electrolytesmentioning

confidence: 99%

“…The Vogel-Tamman-Fulcher (VTF), Willams-Landel-Ferry (WLF), and Arrhenius equations [ 37 , 38 ] are broadly utilized to describe the ion conduction behavior of CPEs. The VTF equation is mostly applied for amorphous ionic conductivity, while the Arrhenius equation is often applied for crystalline ionic conductivity [ 39 , 40 ]. For high molecular weight polymer electrolytes, amorphous ion conduction is prevalent, thus we focus here on the VTF equation.…”

Section: Ion Transport In Binary and Composite Polymer Electrolytementioning

confidence: 99%

Composite Polymer Electrolytes: Nanoparticles Affect Structure and Properties

2016

View full text Add to dashboard Cite

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.

show abstract

“…This peak occurs only in salt-containing polymers and has previously been assigned to ion pair dipoles. 10,19 The dielectric response of the polymer electrolyte can be modeled by an equivalent circuit consisting of electrical circuit elements such as capacitors and resistors or distributed circuit elements such as the Havriliak-Negami ͑HN͒ function. 18,20 The equivalent circuit representation of a dielectric response is never unique, and one needs to have both physical knowledge and complementary information in order to find an appropriate model to represent the system.…”

Section: Introductionmentioning

confidence: 99%

Ionic relaxation in polyethyleneimine-lithium bis(trifluoromethylsulfonyl) imide polymer electrolytes

Pehlivan

Marsal

Georén

et al. 2010

Journal of Applied Physics

View full text Add to dashboard Cite

Polymer electrolytes containing polyethyleneimine and different concentrations of lithium bis͑trifluoromethylsulfonyl͒ imide were investigated by impedance spectroscopy at different temperatures. Two equivalent circuit models were compared for the bulk impedance response. The first one includes a conductive Havriliak-Negami ͑HN͒ element which represents ionic conductivity and ion pair relaxation in a single process, and the second model includes a dielectric HN element, which represents ion pair relaxation, in parallel with ion conductivity. Comparison of the two circuit models showed that the quality of the fit was similar and in some cases better for the conductive model. The experimental data follow the Barton-Nakajima-Namikawa relation, which relates the ion conductivity and the parameters of the relaxation. This indicates that ion conductivity and ion pair relaxation are two parts of the same process and should be described by the conductive model.

show abstract

Broad band dielectric behaviour of plasticized PEO-based solid polymer electrolytes

Cited by 15 publications

References 24 publications

Concentration dependence of ionic relaxation in lithium doped polymer electrolytes

Concentration dependence of ionic relaxation in lithium doped polymer electrolytes

Composite Polymer Electrolytes: Nanoparticles Affect Structure and Properties

Ionic relaxation in polyethyleneimine-lithium bis(trifluoromethylsulfonyl) imide polymer electrolytes

Contact Info

Product

Resources

About