Structural, thermal and ion transport studies on nanocomposite polymer electrolyte-{(PEO + SiO2):NH4SCN} system

Abstract

Development and characterisation of polyethylene oxide (PEO)-based nanocomposite polymer electrolytes comprising of (PEO-SiO 2 ): NH 4 SCN is reported. For synthesis of the said electrolyte, polyethylene oxide has been taken as polymer host and NH 4 SCN as an ionic charge supplier. Sol-gel-derived silica powder of nano dimension has been used as ceramic filler for development of nanocomposite electrolytes. The maximum conductivity of electrolyte ∼2.0 × 10 −6 S/cm is observed for samples containing 30 wt.% silica. The temperature dependence of conductivity seems to follow an Arrhenius-type, thermally activated process over a limited temperature range.

Ion transport studies on Al–Zn ferrite dispersed nano-composite polymer electrolyte

“…The endothermic peak is due to melting of pure PEO, while the exothermic is on account of evaporation of absorbed water. Beyond 125°C PEO starts dissociating in consonance with earlier findings [7]. In DSC studies of Al-Zn ferrite, a small endothermic peak appears at ∼50°C which is possibly due to the removal of absorbed humidity at low temperature.…”

“…In this context, composite polymer electrolytes in general and nano-composite polymer electrolytes in particular have been extensively studied for electrochemical applications over the years due to the possibility of achieving better ionic conductivity [1][2][3][4]. Usually in composite polymer electrolytes (CPE), an inorganic/ceramic, ferro-electric [5][6][7][8][9] or high molecular weight organic filler [10,11] is dispersed in the polymer electrolyte matrix as a third component, which improves the mechanical, electrical and optical properties.…”

Investigation on ion conduction behaviour in Zn-ferrite based polymer nanocomposite electrolyte

“…Different peaks for pure PEO film and NH 4 SCN salt have been reported earlier in a different work [11]. In pristine electrolyte system the peak related to NH 4 + shift from 3149 cm -1 to higher wave number side at 3200 cm -1 indicating the polymer-salt complexation.…”

“…These favorable properties have lead to their potential application in biomedicine [9], magnetic drug delivery and magnetic refrigeration technology [10]. Addition of ferrite filler in PEO matrix normally enhances the polar characteristic of PEO making it electrically more conductive [11]. Zinc ferrite is technologically important because of their high magnetic permeability in the radio frequency region and low core loss.…”

Effect of Plasticizers on Structural and Dielectric Behaviour of [PEO + (NH4)2C4H8(COO)2] Polymer Electrolyte

“…The variations of a.c. conductivity ( ) with frequency for different plasticizers are shown in Figure 4(a). In pristine polymer electrolyte, the conductivity of the system due to dissociation of salt facilitates the free charge carriers/ions which enhances ionic conduction in electrolytes [15]. Incorporation of plasticizers in the pristine electrolyte system provides better mechanical strength as well as higher conductivity.…”