Vibrational and impedance spectroscopic analysis of poly(vinyl alcohol)-based solid polymer electrolytes

Abstract

Solid polymer electrolytes based on poly(vinyl alcohol) (PVA) doped with NH 4 Br have been prepared by the solution-casting method. The complex formation between the polymer and the salt has been confirmed by Fourier transform infrared spectroscopy. The highest conductivity at 303 K has been found to be of the order of 10 −4 Scm −1 for 25 mol% NH 4 Br-doped PVA system. The ionic transference number of polymer electrolyte has been estimated by Wagner's polarization method, and the results reveal that the conducting species are predominantly ions.

Conductivity and dielectric properties of polyvinyl alcohol–polyvinylpyrrolidone poly blend film using non-aqueous medium

“…7 (a),(b) shows that the values of ε′ and ε″ are very high at low frequency and high temperature but at high frequency these are relatively constant with frequency similar behavior has been observed in a number of polymers [29][30][31][32][33]. Similar results have been reported by Ramya and Hema et al for PVA and PVP [34]. Such high value of ε′ may be due to the interfacial effects within the bulk of the sample and electrode effects.…”

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

“…2a-d). The absence of the high-frequency semicircle confirms that the total conductivity is mainly due to the ion conduction, a similar result has been reported by Hema et al [15,16] for the PVA:NH 4 Br and PVA:NH 4 NO 3 polymer electrolyte. The spike is characterized by the electrical double layer capacitance (C dl ) whose value can be found at any position on the spike [17] and is found to be in the order of~10 −9 F. It is interesting to observe that the ionic conductivity of solid polymer electrolyte 85P(ECH-EO):15LiClO 4 1.3×10 −5 Scm −1 at 303 K as reported by Nithya et al [18] has been increased by an order (10 −5 to 10 −4 ) by the addition of a plasticizer.…”

Plasticized chitosan–PVA blend polymer electrolyte based proton battery

“…The Arrhenian conductivity-temperature relationship has been observed for the systems PVA-NH 4 Cl, PVA-NH 4 Br and PVA-NH 4 I [34,35]. For the plasticized system at 70 wt.% EC the activation energy and temperature dependent conductivity is comparable with Ng and Mohamad [36] where the value is ∼0.1 eV.…”