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Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
Portugaliae Electrochimica Acta | Year: 2012

Synthesis of new Ag+ ion conducting glass-polymer electrolytes (GPEs): (1-x) PEO: x [0.75(0.75AgI:0.25AgCl):0.25(Ag2O:P2O5], where 0 < x < 50 wt. (%), are reported. GPEs have been casted using hot-press techniques. The highest conducting composition 70PEO: 30[0.75(0.75AgI:0.25AgCl):0.25(Ag2O:P2O5], with conductivity (σ)~ 6.0 × 10-6S.cm-1, was identified from the compositional dependent conductivity studies and this has been referred to as the Optimum Conducting Composition (OCC). Approximately three orders of conductivity enhancement have been achieved in GPE OCC from that of the pure polymer PEO. The glass-polymer complexation has been confirmed by SEM and DSC analysis. Ion transport parameters viz. ionic conductivity (σ), ionic mobility (μ), mobile ion concentration (n) and ionic transference number (tion) have been characterized using different experimental techniques. Solid-state polymeric batteries were fabricated using GPE OCC as electrolyte and the cell-potential discharge characteristics were studied under different load conditions at room temperature. Source


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
Indian Journal of Pure and Applied Physics | Year: 2013

Synthesis and dielectric studies on a new PEO-PVP blended Na+ ion conducting solid polymer electrolytes (SPEs): (1-x)[75PEO:25NaPO 3]+x PVP, where x in wet. %, are reported. PEO-PVP blended Na + ion conducting SPEs are synthesized using recently developed hot-press method in place of traditional solution cast technique. Structural characterization has been carried out using XRD technique. The some basic ion transport parameters viz. ionic conductivity (σ), activation energy (Ea) and dielectric constant (ε*) have been characterized using different experimental techniques. Source


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
Chinese Journal of Polymer Science (English Edition) | Year: 2013

Polyethylene oxide (PEO)-polyvinylpyrrolidone (PVP) blended Na+ ion conducting solid polymeric membranes: (1-x) [75PEO:25NaPO3] + x PVP, where 0 < x < 12 wt%, are reported. The polymeric blending was done using a solventfree hot-press method. Two orders of conductivity enhancement (σ ca. 1.07 × 10-5 S·cm-1) have been achieved with 3 wt% of PVP (i.e. the composition: [97(75PEO:25NaPO3) + 3PVP]), from that of the pure host: (75PEO:25NaPO3). The conductivity enhancement in PEO-PVP blended solid polymeric membranes have been explained by the ionic conductivity, ionic mobility and mobile ion concentration measurements. Materials characterization and polymer-salt complexation were done with the help of X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermo gravimetric analysis (TGA) studies. The temperature dependent conductivity studies have also been done to compute the activation energy (E a) values from lg σ1/T Arrhenius plots. A solid state polymeric battery was fabricated by using optimum conducting composition of solid polymer electrolyte (SPE OCC), and some important cell parameters were also calculated from the discharge profile of the cell. © 2013 Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg. Source


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
Bulletin of Materials Science | Year: 2015

Ionic drift velocity (vd) measurements of a new Ag+ ion conducting glass-polymer electrolytes (GPEs): (1-x)PEO: x [0.8(0.75AgI: 0.25AgCl): 0.2(Ag2 O: V2O5)], where 0 Source


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
EPJ Applied Physics | Year: 2014

Superionic solids an area of multidisciplinary research activity, incorporates to study the physical, chemical and technological aspects of rapid ion movements within the bulk of the special class of ionic materials. It is an emerging area of materials science, as these solids show tremendous technological scopes to develop wide variety of solid state electrochemical devices such as batteries, fuel cells, supercapacitors, sensors, electrochromic displays (ECDs), memories, etc. These devices have wide range of applicabilities viz. power sources for IC microchips to transport vehicles, novel sensors for controlling atmospheric pollution, new kind of memories for computers, smart windows/display panels, etc. The field grew with a rapid pace since then, especially with regards to designing new materials as well as to explore their device potentialities. Amongst the known superionic solids, fast Ag+ ion conducting crystalline solid electrolytes are attracted special attention due to their relatively higher room temperature conductivity as well as ease of materials handling/synthesis. Ion conduction in these electrolytes is very much interesting part of today. In the present review article, the ion conducting phenomenon and some device applications of crystalline/polycrystalline superionic solid electrolytes have been reviewed in brief. Synthesis and characterization tools have also been discussed in the present review article. © 2014 EDP Sciences. Source

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