Date of Award

May 2018

Degree Name

Master of Science (MS)

Department

Biomedical and Chemical Engineering

Advisor(s)

Ian D. Hosein

Keywords

battery, calcium SPEs, high conductivity, high thermal stability, Polytetrahydrofuran, solid polymer electrolytes

Subject Categories

Engineering

Abstract

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.

Access

Open Access

Available for download on Thursday, December 20, 2018

Included in

Engineering Commons

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