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題 名 | Boron-Triggering Mechanochemical Effect in Relation with Artificial Graphite and Carbon Nanotube=硼引發物理化學效應之人工石墨與碳微管相關研究 |
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作 者 | 李源弘; 潘冠彰; 鄭紳江; 李富生; 張順太; | 書刊名 | 國立臺灣大學工程學刊 |
卷 期 | 89 2003.10[民92.10] |
頁 次 | 頁121-127 |
專 輯 | 「材料」專輯 |
分類號 | 440.34 |
關鍵詞 | 碳微管; 硼引發物理化學效應; 掃瞄式電子顯微鏡; Rietveld精算法; 拉曼分數; Carbon nanotubes; Boron-triggering mechanochemical effect; Scanning electron microscope; Rietveld method; Raman spectra; |
語 文 | 英文(English) |
中文摘要 | 人工石墨的製備是藉由溫度的差異導致碳固溶量不同而析出石墨,製程中導入硼元素則產生一種特殊物理化學效應,改變石墨層間電荷密度,並衍生出富勒烯與碳微管。經由將X射線繞射分析數據以Rietveld method精算結果以及電子顯微鏡觀察可發現奈米結構物的生成,再將精算結果以Marie和Mering公式計算石墨化度,發現硼加入量的增加導致石墨化度的增加,最高石墨化度約90%。人工石墨在約1580cm-1處皆有一拉曼特性峰,此為碳材料中網面結構之sp2鍵結形式,在約1327cm-1處則有一強度較低之拉曼特性峰,是為碳材料鑽石結構中之sp3鍵結形式,本次實驗之人工石墨其1327cm-1之拉曼特性峰強度皆遠低於1580cm-1處拉曼特性峰,表示此人工石墨中具有發達的層狀結構。而應用於鋰離子二次電池陽極材料,經充放電測試,最高電容量可達612mAh/g,此值已優於六方晶石墨理論值372mAh/g甚多。 |
英文摘要 | A metallurgical manufacturing process was explored to produce artificial graphite with high degree of graphitization and natural dispersion of carbon nanotubes. This special graphite named as Dissolution Precipitation Graphite (DPG). The major factor in this metallurgical manufacturing process is the addition of a small amount of boron. There was a boron-triggering mechanochemical effect to produce carbon nanotubes. The micrograph of carbon nanotubes can be observed with scanning electron microscope (SEM). Crystal structures of DPG samples were characterized by XRD, then the XRD data were refined by the Rietveld Method to calculate their degrees of graphitization and Rhombohedral/Hexagonal ratio. According to the results of refinement, the DPG has high degree of graphitization (90%) and increasing Rhombohedral/Hexagonal ratio up to BH2000 (about 7). The types of C-C bonding were characterized by Raman spectroscopy. The peaks of 1331cm-1 and 1580cm-1 of DPG are sharper and weaker than those of the origin carbon material. In the area ratio of sp2 and sp3, that of BH2000 (about 330) is the highest than the others. For the use in the anodic material of the lithium ion secondary battery, it is considered that boron-triggering mechanochemical effect increased the specific capacity (612mAh/g is higher than that of theoretic value 372mAh/g). That means this special artificial graphite is an excellent material for lithium ion secondary battery. |
本系統中英文摘要資訊取自各篇刊載內容。