Preparation and characterization of lithium ion conducting electrolyte based on epoxy natural rubber for electrochemical system / Noor' Aisyah Johari

In this study, epoxy natural rubber (ENR 50) containing different concentration of lithium triflate (L1CF5SO3) salt were prepared using a solution cast technique. The optimum percentage of salt and plasticizer that gave the highest value of electrical conductivity of the sample was determined. Impedance spectroscopy technique was carried out in order to determine the electrical conductivity value. The highest conductivity value was 1.98xl0'ˉ⁵ Scmˉ¹ for 1 g ENR 50 at 35 wt % lithium triflate at 303 K. This conductivity was calculated using the bulk resistance value which can be obtained from the complex impedance plot in frequency range between 100 Hz and 1 MHz. The same procedure was repeated in order to prepare a plasticized samples with propylene carbonate (PC) using the optimum concentration of salted sample. The highest conductivity was 4.92x 10ˉ⁴ Scmˉ¹ at 10 wt % PC. Finally, the highest conducting plasticized sample was then used as an electrolyte in fabrication of lithium-air cell. The capacity obtained was 1260 mAhgˉ¹ which containing of 0.0238 g manganese active materials.