Structural and ionic conductivity studies on P(ECH-EO):γ-BL:LiClO4 plasticized polymer electrolyte

Abstract

The plasticized polymer electrolyte consisting of poly(epichlorohydrin-ethyleneoxide) [P(ECH-EO)], lithium perchlorate (LiClO 4 ) and γ-butyrolactone (γ-BL) have been prepared by simple solution casting technique. The polymer-salt-plasticizer complex has been confirmed by XRD analysis. The ionic conductivity studies have been carried out using AC impedance technique. The effect of plasticizer (γ-BL) on ionic conductivity has been discussed with respect to different temperatures. The maximum value of ionic conductivity is found to be 1.3×10 −4 Scm −1 for 70P(ECH-EO):15γ-BL:15LiClO 4 at 303 K. The temperature dependence of the plasticized polymer electrolyte follows the Vogel-Tamman-Fulcher formalism. The activation energy is found to decrease with the increase in plasticizer.

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“…4(a), can be corroborated to the segmental motion of the polymer chains that helps ions to migrate in the polymer matrix [41][42]. Hence, to explore more on the plasticiser role of [bdmim]BF 4 , the curvature plots were fitted to the Vogel-Tamman-Fulcher (VTF) equation [43]:…”

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“…It could be observed that ε′ increases sharply with decrease in frequency. The higher value of the dielectric constant (ε′) at lower frequencies could be ascribed to the electrode polarization effect, which is associated with the buildup of free charges at the electrode/electrolyte interface forming electric double layer capacitance (at a lower frequency, the charge carriers attain enough time to respond to the lower frequency periodically varying electric field). − This observation also confirms the non-Debye behavior. , The value of ε′ decreases continuously with the increasing frequency and reaches a constant value. At higher frequencies due to the fast periodic variation of the applied electric field, the charge carries do not get sufficient time to follow the direction of the applied field; hence, there is no excess ion diffusion in the direction of the electric field that results in a lower dielectric constant at higher frequencies. , The same trend was observed for dielectric loss (ε″) as a function of frequency measured at various temperatures as depicted in Figure b.…”

“…113−115 This observation also confirms the non-Debye behavior. 116,117 The value of ε′ decreases continuously with the increasing frequency and reaches a constant value. At higher frequencies due to the fast periodic variation of the applied electric field, the charge carries do not get sufficient time to follow the direction of the applied field; hence, there is no excess ion diffusion in the direction of the electric field that results in a lower dielectric constant at higher frequencies.…”