Studies of composite films of polyethylene oxide doped with potassium hexachloroplatinate

Abstract

The permittivity and conductivity relaxation processes of polyethylene oxide (PEO) composite along with potassium hexachloroplatinate (K 2 PtCl 6) electrolytes additive forming PEO/K 2 PtCl 6 complex composite have been investigated. The complex composite has been used as a model for dry-polymer electrolytes (PEs) due to the fact that, the anion is large enough for mimicking the immobilized anion in real dry-polymer electrolytes. Stand-free composite films with 0%, 1%, 3%, and 5% concentrations of K 2 PtCl 6 have been studied using broadband dielectric spectroscopy in the temperatures range from 150 K until 345 K. The microstructural dynamics revealed the α-, β-, and σ-relaxations and their salient spectral characteristics at various concentrations of K 2 PtCl 6 in PEO. The experimental ε" master curves were fitted to HN function for one and/or two relaxation peaks with and without the electrical conductivity contribution in order to investigate the relaxation time (τ), dielectric strengths (Δε), modulus formalism (M") and the electrical conductivitie (σ). The translational and reorientational degrees of freedom of PEO/K 2 PtCl 6 complex composites are responsible for the relaxation behavior which is predicted to be correlated to the relaxation behavior of the polymer electrolyte below and above the glass transition temperature (T g). The relaxation time (τ) deduced from β-relaxation follows Arrhenius-like behavior while that deduced from α-relaxation process follows Vogel-Tamman-Fulcher (VTF) behavior.

Electrochemical analyses ofZrO2dispersoid incorporated poly (styrene‐methyl methacrylate) blend gel electrolytes for lithium‐ion battery

“…The whole complex, the conductivity rises with the rise of temperature and this can be updated by the free volume model. The arc of the plots shows that ionic conductivity appears to follow Vogel–Tammann–Fulcher relation, 35 which designates that transport of ions in polymer matrices requires polymer zig‐zag motion. Miyamoto et al 36 conveyed that the ionic conductivity improved with growing temperature as a consequence of the free volume model where, the temperature rises, the polymer electrolyte is enlarged simply and harvest free volume.…”

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“…The ion conduction in PEO/KOTf composite films predominantly occurs within the amorphous phase through the segmental motion of the cations (K + ) along the chains of PEO. 53 Ionic-electronic coupling in materials occurs through various mechanisms, such as electrostatic interactions, van der Waals forces, hydrogen bonding, and other intermolecular interactions. These interactions facilitate the simultaneous transport of ions and electrons within the material.…”

Physicochemical Properties of Organic Molecular Ferroelectric Diisopropylammonium Chloride Thin Films

“…The perfect fit indicated that the system is thermally activated. This behavior can be directly related to the significant surge of the cations’ value, leading to the cation jump to the next coordinating site and, thus, increasing the energy of segment vibrations [ 46 ] which, in turn, leads to abrupt segmental motion counter to the hydrostatic pressure [ 47 ]. In addition, increasing the temperature enhances a significant carrier concentration mobility of the free electrons [ 46 , 48 ].…”