Effect of Temperature on the Transport Property of PVdF-HFP-MPII-PC/DME Gel Polymer Electrolytes.

Gel polymer electrolytes employing the co-polymer poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) as the polymer host were prepared by soaking the PVdF-HFP films in a liquid electrolyte of 1.0M 1- methyl-3-propyl imidazolium iodide (MPII) ionic liquid dissolved in a mixture of propylene carbonate (PC) and 1,2- dimetoxyethane (DME) (v/v=7:3). Conductivity of PVdF-HFP-MPII-PC/DME electrolyte was investigated as a function of temperature. Conductivity enhancement with temperature is attributed to the increase in the number, n and mobility, μ of free ions. The n and μ of free ions have been determined quantitatively by impedance spectroscopy. [ABSTRACT FROM AUTHOR]