Chitosan and Ionic Liquid Based Solid Polymer Electrolytes: the Anion Alkyl Chain Length Effect

摘要

This work describes novel polymer electrolytes based on chitosan matrix doped with three ionic liquids of the series 1 -ethyl-3-methylimidazolium alkylsulfonate [C_2mim][C_nSO_3]. The effect of the increase of the anion alkyl chain length on the thermal, morphological and electrochemical properties of these materials was studied. The samples were characterized by means of thermal analysis (DSC and TGA), atomic force microscopy (AFM), complex impedance spectroscopy and cyclic voltammetry. All electrolyte samples exhibited an amorphous nature and thermal stability up to 150 ℃. These materials have adequate electrochemical stability and their ionic conductivity decreases with the increase of the anion alkyl chain length.