Influence of charge carrier density, mobility and diffusivity on conductivity–temperature dependence in polyethylene oxide–based gel polymer electrolytes

Abstract

Determining the transport properties of charge carriers is essential to understand the factors that affect the conductivity trend of a polymer electrolyte system. In this work, charge carrier transport parameters of polyethylene oxide–based gel polymer electrolytes were estimated from fitting the Nyquist plot with the impedance equation, derived from the equivalent circuit that consists of a resistor in series with a constant phase element. The increase in electrolyte conductivity with temperatures from 303 K to 373 K is attributed to the increase of free ions, n (TPA+ cations and I¯ anions) and not to ionic mobility, μ. The decrease in μ with temperature is associated with the increase in the Stokes drag coefficient due to increase in ion collisions. This work explains how conductivity changes with number density of ions and mobility at various temperatures.

Substantial Proton Ion Conduction in Methylcellulose/Pectin/Ammonium Chloride Based Solid Nanocomposite Polymer Electrolytes: Effect of ZnO Nanofiller

“…At 8wt.% ZnO, the carrier concentration was reduced by two orders due to a lower dielectric constant. Hence, the collision rate reduced, leading to an increase in and [ 55 ]. Thus, in the present system, the ionic conductivity of NCPE samples was not entirely dependent on carrier concentration, .…”

Charge transport and heavy metal removal efficacy of graphitic carbon nitride doped with CeO2

“…One should expect close values of DC-conductivity for both samples, according to the relation: σ dc = qnμ , in which n is the number density of charge carriers and μ is their mobility. 53–56…”

“…One should expect close values of DC-conductivity for both samples, according to the relation: s dc = qnm, in which n is the number density of charge carriers and m is their mobility. [53][54][55][56] The complex conductivity function: s* = s ′ + is ′′ , when the external electric eld is low, i.e. in the linear response region, is related to complex permittivity, according to the relation:…”

Sodium‐Ion‐Conducting Hydrogel Material: Synthesis, Characterization and Conductivity Studies

“…The ionic diffusivity coefficient ( D ) is a very important parameter that measures the efficacy of rapid diffusion of ions inside the polymer matrix under the influence of an external electric field. Ionic diffusivity is calculated using the equation 11: [50] $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {\bf D}={\bf 2}\ {\bf f}{_{{\bf max}}}\ {\bf l}{^{{\bf 2}}}/{\bf 32}\ ({\bf tan}\ {\bf\delta} {_{{\bf max}}}){^{{\bf 3}}}\hfill\cr}}$$$ …”