李源弘2006-07-252018-06-282006-07-252018-06-282001http://ntur.lib.ntu.edu.tw//handle/246246/12363含碳鐵水於相圖上因高低溫差有所不同導致碳固溶量差異而析出石墨材料。有別於相圖的是其析出物並不只是單純的石墨相，而是包含fullerenes 與carbonnano tube 的複合物。此外亦加入不同量的硼元素探討析出石墨的影響。使用X 光繞射儀，拉曼光譜儀，以及場發射掃描式電子顯微鏡研究此析出石墨的特性結構。並將X 光繞射儀所得數據以Rietveld method 精算，將精算的結果以Maire and Mering 公式計算石墨化度， 發現硼加入量10000ppm 所產生的析出石墨有最高之石墨化度（約93.04﹪）。而從場發射掃描式電子顯微鏡觀察到此系列析出石墨有微碳管的出現（Carbon Nano Tube），約數十至數百奈米。同時也將此石墨材料作成鋰離子二次電池陽極材料，做電化學相關測試，硼加入量300ppm 有最高電容量518mAhg-1，其已超過完美石墨理論值372mAhg-1。The graphite is precipitated by the different carbon solubility due to a variety of temperatures in the phase diagram. This graphite composite including the fullerenes and carbon nano tube is different from the simple graphite in the phase diagram. Besides, it is needed to discuss with the precipitated graphite by adding different boron contents. The character and structure of precipitated graphite were studied by X-ray diffraction, Raman spectra and FE-SEM. The data obtained by X-ray diffraction was refined by Rietveld method, And as a result, the graphitization degree has been calculated with Maire and Mering method。G4 (added 10000ppm boron) has the highest graphitization degree is of 93.04%. Carbon nano tube was observed around the graphite’s surface by FT-SEM. The size is from several microns to several tens of nanometers. For these graphites, they are suitable for the use as anode material in the Li-ion second battery. And the electrochemical measurements were carried out with Cyclic Voltammetry and Impedance spectra. G2 (added 300ppm boron) has the highest energy density (518mAhg-1). This value exhibited it is higher than the perfect graphite theoretical value (372 mAhg-1)。application/pdf230766 bytesapplication/pdfzh-TW國立臺灣大學材料科學與工程學研究所石墨X 光繞射儀拉曼光譜場發射掃描式電子顯微鏡電容量graphiteX-ray diffractionRietveld MethodRaman spectrafullerenesFE-SEMenergy densityreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/12363/1/892214E002071.pdf