Electrochemical, Thermal and Structural Studies on the TiO2 – Based Composite Polymer Electrolyte

Kong, Hoe Yik (2020) Electrochemical, Thermal and Structural Studies on the TiO2 – Based Composite Polymer Electrolyte. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Composite polymer electrolytes (CPEs) consisting of polyvinyl alcohol (PVA), lithium trifluoromethanesulfonate (LiTf), and titanium (IV) oxide (TiO2) were prepared via solution casting technique. The ionic conductivity of the polymer electrolyte varies with a subtle increase in the composition of TiO2. The polymer electrolyte obtained the highest conductivity at (3.45 ± 0.01) × 10-4 S/cm at ambient temperature. The majority of the composite polymer electrolytes obey the Arrhenius rule based on the temperature dependence study. The complexation between PVA, LiTf, and TiO2 is proven in Attenuated Transform Fourier transform infrared spectroscopy (ATR-FTIR) study. The glass transition temperature (Tg) of the composite polymer electrolyte varies with mass loadings of TiO2 shown in differential scanning calorimetry (DSC) thermogram. The thermal properties of the composite polymer electrolyte were determined via Thermogravimetric Analysis (TGA). The largest potential difference was determined at 5.5 V with the addition of 10 wt.% TiO2, as proven from the Linear Sweep Voltammetry (LSV) analysis.