Polymer electrolytes based on copolymer of poly(ethylene glycol) dimethacrylate and imidazolium ionic liquid

Abstract

Polymer electrolytes based on the copolymer of N-vinylimidazolium tetrafluoroborate (VyImBF 4) and poly(ethylene glycol) dimethacrylate (PEGDMA) have been prepared. Ethylene carbonate (EC) and LiClO 4 are added to form gel polymer electrolytes. The chemical structure of the samples and the interactions between the various constituents are studied by FT-IR. TGA results show that these polymer electrolytes have acceptable thermal stability, are stable up to 155 °C. Measurements of conductivity are carried out as a function of temperature, VyImBF 4 content in poly(VyImBF 4- co-PEGDMA), and the concentration of EC and LiClO 4. The conductivity increases with PEGDMA and EC content. The highest conductivity is obtained with a value of 2.90 × 10 − 6 S cm − 1 at room temperature for VP1/EC(25 wt.%)–LiClO 4 system, corresponding to the LiClO 4 concentration of 0.70 mol kg − 1 polymer.