Date of Award
Master of Science (MS)
Biomedical and Chemical Engineering
Ian D. Hosein
battery, calcium SPEs, high conductivity, high thermal stability, Polytetrahydrofuran, solid polymer electrolytes
Polytetrahydrofuran (PTHF) and 3,4-epoxycyclohexylmethyl 3ʹ,4ʹ-epoxycyclohexane carboxylate (Epoxy) were crosslinked by photocuring via active monomer mechanism to make solid state networks. The networks were loaded with various amounts of calcium salt and calcium nitrate to create calcium ion solid state electrolytes. The loading range includes both salt-in-polymer and polymer-in-salt regimes. The O:Ca ratios range from 1.1 to 13.8. The ion-conductivity determined by electrochemical spectroscopy impedance and thermal properties (TGA, DSC) and Raman spectroscopy of PTHF-Epoxy/Ca(NO3)2 polymer electrolytes were measured. All samples were rubber-like and stable at temperatures from room temperature to 120 °C. With increase of salt loading, ion-conductivities of electrolytes first increase and then decrease. The one with highest ion-conductivity had a O:Ca ratio at 1.9 and conductivity of 1.14×10-4 S/cm at room temperature (25°C). At about 110°C, this electrolyte presents the highest conductivity at 0.0157 S/cm. Thermal analysis shows the material has an amorphous structure and high thermal stability. This system provides a route to create calcium ion solid state electrolytes.
Wang, Jiayue, "Solid Polymer Electrolytes from Crosslinked Polytetrahydrofuran for Calcium Ion
Conduction" (2018). Theses - ALL. 228.