Measurement of Lithium Transference Number in PMMA Solid Polymer Electrolytes Doped with Micron-sized Fillers

Eric Koh RenWei

Abstract


PMMA solid polymer electrolytes (SPEs) are much safer than gel polymer electrolytes (GPEs) due to their better mechanical and thermal stabilities. In this study, PMMA-LiCF3SO3-EC, PMMA-LiCF3SO3-EC-Al2O3(≤10µm), and PMMA-LiCF3SO3-EC-SiO2(≤10µm) were prepared using solution cast method, their ionic conductivity and lithium transference number was investigated using electrochemical impedance spectroscopy (EIS) and Bruce-Vincent method, respectively. The experimental result shows that PMMA polymer electrolytes doped with SiO2 (≤10µm) exhibits the highest ionic conductivity of 2.35×10-4 S/cm and lithium transference of 0.263 at room temperature. Linear sweep voltammetry (LSV) and Cyclic voltammetry (CV) analysis also shows that PMMA SPEs incorporated with SiO2 (≤10µm) fillers can achieve electrochemical stability up to 3.2V, exhibits excellent reversibility, and good discharging performance.


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