Electrical Characterization of PVdF based Proton Conducting Polymer Gel Electrolytes

摘要

Background: Polymer gel electrolytes have attracted much intention due to their high ionic conductivity (10~(-2) - 10~(-3) S/cm) along with other suitable properties like good thermal stability, compatibility with electrode materials, easy workability, wider control of properties etc. These materials are also called smart materials due to their practical applications in various devices like high energy power devices, elec-trochromic devices, supercapacitors, devices for Infra-red systems etc. This paper mainly discusses the enhancement of an ionic conductivity with the addition of polymer. No appreciable change in conductivity of gel electrolytes has been observed with temperature, which makes them suitable for device applications. Methods: Liquid electrolytes were prepared by dissolving orto-nitro benzoic acid (o-NBA) in the ternary mixture of ethylene carbonate (EC), propylene carbonate (PC), and dimethy-lacetamide (DMA) (in 2:2:1 volume ratio). The homogeneous polymer solution of PVdF in acetone is prepared and then added to the liquid electrolyte along with continuous stirring. Polymer gel electrolytes are obtained after the evaporation of acetone. Ionic conductivity of liquid and polymer gel electrolytes is measured by HP4284A precision LCR meter (having frequency range from 20Hz-1MHz) using complex impedance spectroscopy.