| Summary: | 碩士 === 國立臺南大學 === 材料科學系碩士班 === 107 === In this study, the sol-gel method was used to prepare LiTi2(PO4)3 solid electrolytes materials with and without adding Poly(ethylene glycol). For the first part of the experiment, the LTP precursor solution was prepared and coated onto the substrates (glass or fluorine-doped tin oxide conductive glass) to form preliminary films by a spin coater. Then the preliminary films were plating sample is subjected to appropriate heat treatment to form the crystalline LTP films.
On the another part of the experiment, we attempted to change the process parameters which were the addition amount of poly(ethylene glycol) (PEG) and the thermal annealing temperature to obtain the porous LTP/PEG films with enhanced ionic conductivity.
The materials characterization of LTP and LTP/PEG films includes the crystal phase characterized by XRD, morphology obtained by SEM, and electrochemical properties proceeded by electrochemical workstation. The relation among the materials characteristics, the different concentrations of poly(ethylene glycol), and annealing temperatures were discussed.
The experimental results show that the observed diffraction peak in the XRD patterns of the thin films corresponds to the LTP crystal phase with increasing the annealing temperature up to 550 ° and 600 °C (JCPDS：No.35-0754). The highest ionic conductivity of the LTP electrolyte at room temperature is 2.80 ×〖10〗^(-6) S/cm for sample with adding of 2.0% PEG 2000 (i.e., molecular weight 2000 g/mol). According to the results of Tafel plot, the relation among the polarization resistance, corrosion potential, and corrosion current is studied.
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