Investigation on LiTFSI doped plasticizer as potential solid electrolytes for lithium batteries

Abstract

Solid polymer electrolytes composed of chitosan and PEO as the host polymer and LiTFSI salt containing EC and PChas been prepared, respectively by the solution cast technique. These complexes with different amounts of plasticizers were investigated as possible ionic conducting polymers by using the Electrochemical Impedance Spectroscopy (EIS). At room temperature, the highest ionic conductivity of the complexes was observed at 1.06 x 10-4 1 S cm-for 45 wt.% of EC and 3.43 x 10-Scm1for40 wt.% of PC. The ionic conductivity of the polymer blends increase with increasing the plasticizers concentration could be attributed to the increase in the number mobile ions as a result of plasticizer dissociation. Dielectric data were5 analyzed using complex permittivity, & · ,, complex electrical modulus, M* and loss tangent, tan 5. The existences of M1 peaks indicate that the samples are ionic conductors. Further, the interaction of the polymer chains with the different plasticizers concentration is substantiated by Fourier Transform Infrared (FTIR) spectroscopy. The FTIR spectra have found evidence of a complexation for both EC and PC systems.