Solid Polymeric Electrolytes Based on Poly(vinylpyrrolidone-co-methacrylic acid) Blends

Abstract

Solid polymeric electrolytes based on poly(vinylpyrrolidone) plasticized with dioctylftalate and containing LiCl salt were obtained. The samples were prepared as membranes in the co-polymerization process of vinylpyrrolidone (VP) with methacrylic acid (20% in VP mass) and tetraethylene glycol diacrylate (10% in VP mass) as cross-linking agent. The ionic conductivity measurements as a function of plasticizant contents revealed that the best results were achieved with 20% (in VP mass) of dioctylftalate. The influence of lithium salt on the ionic conductivity measurements was also verified and the samples containing 20% of plasticizant and 8% (in VP mass) of LiCl showed conductivity of 3 · 10−3 S/cm. From the measurements of ionic conductivity as a function of temperature an increase was observed in the conductivity values of one order of magnitude reaching 10−2 S/cm at 80°C. The activation energy value obtained from these measurements was 25 kJ/mol, which it was comparable with other solid polymeric electrolytes. These new SPEs based on poly(vinylpyrolidone) showed very good conductivity values at room temperature and are very good candidates to be applied in new devices.