Conductivity studies of plasticized PEO–HPF6–fumed silica nanocomposite polymer electrolyte system

Abstract

The effect of the addition of propylene carbonate (PC) on the ion transport behaviour of nanocomposite polymer electrolytes having composition of polyethylene oxide-hexafluorophosphoric acid-fumed silica has been studied. The ionic conductivity of 6.89× 10 −4 S cm −1 at 298 K has been obtained for these electrolytes along with good mechanical and thermal properties. The variation of 1 H NMR linewidth with temperature shows line narrowing at the glass transition and melting temperature of the electrolytes which suggests the onset of long-range ion translational motion. The increase in ionic conductivity with the addition of PC is related to the transformation of these electrolytes to the amorphous phase which has been supported by X-ray diffraction results. The polymer electrolytes are thermally stable up to around 498 K and hence are suitable for various applications.

Influence of high and low dielectric constant plasticizers on the ion transport properties of PEO: NH4HF2 polymer electrolytes

“…In the present work, the influence of high dielectric constant plasticizers (propylene carbonate (PC) and dimethyl acetamide (DMA)) and low dielectric constant plasticizers (dimethyl chloride (DMC) and diethyl carbonate (DEC)) on the ion transport properties of PEO-ammonium bifluoride (NH 4 HF 2 ) polymer electrolytes has been studied. Since the presence of plasticizer in its large amount deteriorates the mechanical strength of polymer electrolytes, 19 –21 therefore, care has been taken to use the plasticizer up to optimum concentration. In this way, the mechanical stability and flexibility of the polymer electrolytes should be maintained as well.…”