Effect of lithium triflate (LiTf) concentration on the properties of poly (glycidyl methacrylate-co-methyl methacrylate) P(GMAco-MMA)-based solid polymer electrolyte was investigated. The copolymer of (GMA-co-MMA) was synthesized by photopolymerization method. P(GMA–MMA) was fixed at the ratio of 90:10 based on the conductivity result of the electrolyte film. The electrolyte samples were characterized using impedance spectroscopy (EIS), cyclic voltammetry (CV) and thermogravimetric analysis (TGA). The room temperature conductivity was improved about six orders upon the addition of 30 wt. % LiTf salt into the polymer host. The highest room temperature conductivity was 1.4×10-6 S cm-1 at 30 wt. % LiTf. The highest conductivity of 1.25×10-4 S cm-1 was achieved at 393 K. The polymer electrolyte system exhibits Arrhenius-like behavior with the pre-exponential factor of 1.25×10-4 S cm-1 and activation energy of 0.39 eV. The electrolyte showed electrochemical stability window up to 3 V. The thermal stability increases with the salt concentration. The above results indicate that the electrolyte has potential for lithium ion battery application.
glycidyl methacrylate (GMA), methyl methacrylate (MMA), ionic conductivity, solid polymer electrolyte, lithium triflate
The authors are thankful to the Universiti Kebangsaan Malaysia for allowing this research to be carried out in various laboratories. This work was supported by the UKM grant UKM-DLP-2012-021.
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