Effect of lithium triflate salt concentration in methyl cellulose-based solid polymer electrolytes

Solid polymer electrolytes (SPEs) film containing methyl cellulose (MC) serves as polymer host and lithium triflate (LiCF₃SO₃) as a doping salt are prepared by solution cast technique. The complexation between polymer and salt are confirmed by FTIR spectral analysis. The Li⁺ observed to form a coordination bond with the oxygen atom of the ether group (C-OC) at wave number 1051 cm^-1 to form Li⁺→OC₂ complexes. X-ray diffraction (XRD) spectral studies confirm addition of salt increased the amorphousness of the films consequences improve in ionic conductivity. The sample with 30 wt. % of LiCF₃SO₃ exhibited highest conductivity with the value of 2.1342 × 10^-5 Scm^-1 at ambient temperature. The conductivity-temperature dependence studies showed that the conductivity of all samples seems to obey Arrhenius behavior and the conducting species are predominated by ions.