| 研究生: |
廖欣怡 Liao, Hsin-Yi |
|---|---|
| 論文名稱: |
核殼結構碳/磷酸鋰鐵複合材之製備及其於鋰離子電池之應用 Preparation of C/LiFePO4 Core-Shell Composite Applied for Lithium-Ion Battery |
| 指導教授: |
郭炳林
Kuo, Ping-Lin |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
| 論文出版年: | 2012 |
| 畢業學年度: | 100 |
| 語文別: | 中文 |
| 論文頁數: | 78 |
| 中文關鍵詞: | 鋰離子電池 、正極材料 、磷酸鋰鐵 、核殼結構 |
| 外文關鍵詞: | Li-ion batteries, cathode materials, LiFePO4, core-shell structure |
| 相關次數: | 點閱:88 下載:3 |
| 分享至: |
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本研究是將LiFePO4的前驅鹽吸附於碳球表面,利用溶膠凝膠法合成出核殼結構C/LiFePO4複合材。使用不同的碳球種類、碳球添加量和不同的鍛燒溫度皆會影響C/LiFePO4的晶型、外觀形態以及電池性能。實驗中以X-射線繞射光譜、掃描式電子顯微鏡、穿透式電子顯微鏡、顯微拉曼光譜儀及電池性能測試鑑定C/LiFePO4複合材,可發現以600°C鍛燒所製備的C/LiFePO4複合材效能最佳。
在本研究中以三種不同尺寸及表面積的碳球,Lamp black、Super P以及中空中孔洞碳球製備C/LiFePO4複合材,其中以中空中孔洞碳球合成之C/LiFePO4複合材(HLFP)的外觀形態最接近完整核殼結構。而在電池性能測試中,HLFP在0.1C放電時電容量為146.7 mAh g-1,而在10C放電時電容量仍有81.5 mAh g-1,表示核殼結構的C/LiFePO4複合材對於高電流密度下的充放電是有幫助的。
C/LiFePO4 core-shell composites were synthesized by sol-gel method through adsorption of Fe3+, Li+ and PO43- ions onto the carbon sphere surface. The crystal structure, morphology and electrochemical performance of C/LiFePO4 varied at different calcination temperature, carbon sphere and carbon/Li+ ratio. In this study, X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscope (TEM), Raman spectra and battery test system used to examine the C/LiFePO4 core-shell composites. It showed that the C/LiFePO4 composite which was annealing at 600°C had the best electrochemical performance.
C/LiFePO4 composites were synthesized by three different type carbon spheres which had different size and surface area, such as Lamp black, Super P and hollow carbon sphere. From SEM and TEM images, it showed that the morphology of C/LiFePO4 composites which were synthesized by hollow carbon sphere (HLFP) is near to core-shell shape. At 0.1 and 10C rates, the capacities were 146.7 and 81.5 mAh g-1, respectively. These results revealed that this core-shell electrode material can be a potential candidate for high-performance Li-ion batteries.
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