Alok Bhatt

Electrical properties of a new Ag+ ion conducting glassy system: x[0.75AgI:0.25AgCl] : (1−x)[Ag2O : P2O5]

A new fast Ag+ ion conducting glassy system: x[0.75AgI:0.25AgCl]: (1−x)[Ag2O: P2O5], where 0.1 ≤ x ≤ 1 in molar weight fraction, has been synthesized by melt-quench technique using a high-speed twin roller-quencher. An alternate host salt: ‘quenched [0.75AgI: 0.25AgCl] mixed system/ solid solution’, has been used in place of the traditional host AgI. The compositional dependence conductivity studies on the glassy systems: x[0.75AgI:0.25AgCl]: (1−x)[Ag2O: P2O5] as well as xAgI: (1−x)[Ag2O: P2O5] prepared identically, indicated that the composition at x=0.75 exhibited the highest room temperature conductivity. The composition: 0.75[0.75AgI: 0.25AgCl]: 0.25[Ag2O: P2O5] has been referred to as optimum conducting composition (OCC). The study also revealed that the new/ alternate host yielded better electrolyte system. The activation energy (Ea), involved in the thermally activated conductivity process has been computed from ‘log σ − 1/T’ Arrhenius plot.

Ionic Mobility, Drift Velocity, and Dielectric Studies on Ag + Ion Conducting Glassy Electrolytes

Ionic mobility (μ), ionic drift velocity (v_d), and dielectric measurements of new Ag^+ ion conducting glassy systems: x[0.75AgI: 0.25AgC1]: (1 - x)[Ag_2O: V_2O_5], where 0:1 ＜ x ＜ 1 in molar weight fraction, are reported. The present glassy electrolytes have been synthesized by the melt-quench technique using a high-speed twin roller-quencher. An alternate host salt: ’quenched [0.75AgI: 0.25AgC1] mixed system/solid solution’ has been used in place of the traditional host AgI. The compositional dependence conductivity studies on the glassy systems indicated that the composition 0.8[0.75AgI: 0.25AgC1]: 0.2[Ag_2O: V_2O_5] shows the highest conductivity (σ ~ 9.0 × 10^(-3) S/cm) at room temperature. Some other basic ion transport parameters, viz. the mobile ion concentration (n) and ion transference number (t_(ion)), have also been characterized using different experimental techniques.

Temperature dependent ionic conductivity and mobility studies of hot-pressed solid polymer electrolytes

Temperature dependent ionic conductivity (σ), ionic mobility (µ), and mobile ion concentration (n) of the hot-pressed Solid Polymer Electrolytes (SPEs): (1-x) PEO: x NaBr, where 0 < x < 50 in wt. %, has been reported. SPE films have been casted using a hot-press technique in place of the traditional solution cast method. A conductivity enhancement of the two orders of magnitude was achieved in SPE film composition: (70PEO: 30NaBr) at room temperature and this has been referred to as Optimum Conducting Composition (OCC). To determine the activation energy (Ea), energy of migration (Em) and energy of formation (Ef) temperature dependent studies of SPE OCC have been carried out with the help of various experimental procedures.

Synthesis and Characterization of Hot-Pressed Solid Polymer Electrolytes

Synthesis and ion transport characterizations on hot-pressed solid polymer electrolytes (SPEs): (1-x) PEO: x KBrO 3, where x in wt. (%), are reported. The compositional (x) dependent conductivity (σ) studies revealed SPE film: (70PEO: 30KBrO 3) as the Optimum Conducting Composition (OCC) with room temperature conductivity σ ~ 4.36 × 10 -7 Scm -1 , which is more than two orders of magnitude higher than that of pure PEO. To understand the ion transport behavior in SPE films, the measurement on some basic ionic parameters viz. ionic conductivity (σ), ionic mobility (μ) and mobile ion concentration (n) have been carried out using different experimental techniques. Material characterizations were done with the help of XRD, SEM, DSC and TGA techniques. The activation energies (E a

Ion Transport Properties of Hot-Pressed Solid Polymer Electrolytes: (1-x) PEO: x NaHCO3

Ion transport properties of hot-pressed Solid Polymer Electrolyte (SPE) membranes: (1-x) PEO: x NaHCO3, where x = 0 – 50 wt. (%), has been reported. SPE films have been casted using a hot-press technique in place of the traditional solution cast method. A conductivity enhancement of the two orders of magnitude was achieved in SPE film: 70PEO: 30NaHCO3 and this composition has been referred to as Optimum Conducting Composition (OCC). Materials characterization was done with the help of FTIR and DSC techniques. The ion transport behavior in SPE membranes have been discussed on the basis of experimental measurements on their ionic conductivity ( ) and other parameters. The temperature dependent conductivity studies have also been done to compute the activation energy (Ea) values by least square linear fitting of ‘log – 1/T’ Arrhenius plots.