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

Abstract

Present paper deals with, improvement in ion transport property and dielectric relaxation of polyethylene oxide (PEO)-based polymer electrolytes subsequent to dispersal of nanosized Zn-ferrite filler particles. The nanocomposite polymer electrolyte (NCPE) system [93PEO:7NH 4 SCN]: x% Zn-ferrite was prepared by solution cast technique through dispersal of sol gel derived Zn-ferrite nano powder in the pristine polymer electrolyte solution. The structural and morphological behavior of NCPEs have been studied by XRD, SEM, IR and DSC measurements. Electrical conductivity (both a.c. & d.c.) measurement on nanocomposite polymer electrolyte sample have been carried out using impedance spectroscopic technique. Dielectric relaxation studies were extracted by impedance data. The hopping ion transport mechanism in NCPEs has been concluded with the help of dielectric and modulus formalism.

Ion Transport and Dielectric Studies on [PEO:TiO2]:NH4SCN Nanocomposite Polymer Electrolytes

“…The high value of ( ε ′ and ε ′′) in low frequency region might be due to existence of an electrode and interfacial polarization—The Maxwell–Wagner–Sillars effect. [ 26 ] It is clear that this effect is only observed at temperature higher than 343 K. In general, the electrode polarization is attributed to the blocking charge carriers at electrode, which is clarifying the abnormal increase of the real permittivity at low frequencies and high temperatures. On the other hand, an interfacial polarization means the polarization takes place at interface of existence of crystallinity, absorved water and presence of heterogeneity.…”

“…This feature is typical of nanocomposite polymer electrolytes. [24][25][26][27][28] XRD studies have shown intercalation of TiO 2 in pristine electrolyte. This intercalation is likely to promote dissociation of salt leading to enhancement in the value of carrier concentration thereby causing increase in conductivity values Polymer-filler-salt interaction has also been noticed in XRD profiles (Figure 1).…”