The study on the conductivity of styrene–maleic anhydride copolymer electrolytes based on poly(ethylene glycol)400 and LiClO4

Abstract

Polyelectrolytes, in this study were synthesized from styrene–maleic anhydride (SMA) copolymer, poly(ethylene glycol)400 (PEG400), and lithium perchlorate (LiClO4). Fourier transform infrared spectroscopy (FTIR), and 7Li magic angle spinning (MAS) solid-state NMR were used to monitor the interaction between Li+ ions and polymer. The results of FTIR and 7Li MAS solid-state NMR indicate the Li+ ions are preferentially coordinated to the ether oxygen of PEG. The Tg of the PEG segments in polyelectrolyte increases with LiClO4 concentration, as determined by differential scanning calorimetry (DSC), indicating that solubility of the Li+ ions in the host polymer increases with the PEG content. Impedance spectroscopy (IS) shows that the bulk conductivity of polyelectrolytes and the conductivity behavior obeys the Vogel–Tamman–Fulcher (VTF) equation.