| Summary: | 碩士 === 國立中興大學 === 物理學系所 === 100 === A battery is prepared using lithium as an anode electrode and lithium iron phosphate as a chathode electrode. The gelled polymer electrolyte is prepared by mixing LiBF4 lithium salts, polyacrylonitrile and ethylene carbonate. Ac impedance is employed to elucidate the lithium ion transport between the interfaces of electrolyte and electrodes. Cyclic voltammetry is used to study the electrochemical reaction of the battery. The charge/discharge property of the battery is explored by a multi-cell battery charger/discharger. The results indicate that, as the content of LiBF4 lithium salt increases, charge capacity of the battery increases, while, both the resistance of the solid electrolyte interface (SEI) and the irreversible capacity decrease. However, it is harmful to the battery properties as the content of LiBF4 lithium salt exceeding the solubility of the polymer. It is helpful to the electrical properties of the battery by increasing polyacrylonitrile content. However, this will increase the assembling difficulty of the battery.
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