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研究生:曾軍豪
研究生(外文):Chung-Hao Tzeng
論文名稱:直接成長奈米碳管於導體上做為鋰離子電池陽極的電化學研究
論文名稱(外文):Directly Growth of Carbon Nanotubes on Current Collector as the Anode of Lithium-ion Battery
指導教授:陳家俊陳家俊引用關係
指導教授(外文):Chia-Chun Jay Chen
學位類別:碩士
校院名稱:國立臺灣師範大學
系所名稱:化學系
學門:自然科學學門
學類:化學學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:45
中文關鍵詞:鋰電池陽極材料碳材
外文關鍵詞:Lithium-ion batterycardon materialimpedance
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在鋰電池的材料研究中所要克服的困難大多是以呈現更高電容量或是更穩定的工作環境兩方面來加以改良,而本實驗室所採用的材料為直接成長奈米碳管於導體上作為鋰電池的陽極。
而在鋰電池操作過程中,電極與電解液中間會形成鈍化層(solid electrolyte interface, 簡稱SEI) ,由於鈍化層是電池中內電阻最主要的來源,故一直是被主要探討的目標,本文將用電化學阻抗頻譜法(Electrochemical Impedance Spectroscopy, 簡稱EIS)來探討碳管成長時候加入氮氣對於鈍化層的影響,而將譜圖以簡單的電阻電容電路圖(equivalent-circuit model, 簡稱ECM)模擬也可由電容(capacitance)值計算出鈍化層的厚度。
從碳管當陽極所組成鋰電池所做的測試中,有加入氮氣成長的碳管的電極在第一次放電過程,電容量高達979.66 mAh/g,而在第二圈可逆電容量可維持原來的54%,其內電阻於充放電20圈後內電阻為50~60歐姆面積單位(Ω× ㎝2) ,相較於未加入氮氣成長的碳管的100~150歐姆面積單位(Ω× ㎝2)內電阻還要低很多,而由簡單的平行電路板公式中也可算出前者的鈍化層厚度將近260nm,後者為450nm,由此可更進一步確定碳管加入氮氣的優點。
In the material research of the lithium battery, the higher capacity and the more stable work environment are important issues. In my laboratory, I grow carbon nanotubes (CNTs) directly on current collector as the anode of the lithium battery.
During the charging/discharging process of the lithium battery, the passive film or the solid electrolyte interface (SEI) formed on the electrode surface give a large resistance. In this study, I also use Electrochemical Impedance Spectroscopy (EIS) to know the influence of the CNTs with/without nitrogen. By using equivalent-circuit model, the thickness of SEI can also be calculated from the value of capacitance part.
In this results, the 1st discharging capacity of the battery of CNTs with nitrogen is 979.66 mAh/g and during the 2nd cycle, the efficiency is 54%. The resistance is 50~60 ohms×cm2 after charging/discharging 20 cycles and the resistance of the battery of CNTs without nitrogen is 100~150 ohms×cm2. The SEI thickness of the former is 260 nm, and the latter is 450 nm.
目錄
中文摘要 …………………………………………………………… Ⅰ
英文摘要 …………………………………………………………… Ⅱ
誌謝 ………………………………………………………………… Ⅲ
目錄 ………………………………………………………………… Ⅳ
表目錄 ……………………………………………………………… Ⅵ
圖目錄 ……………………………………………………………… Ⅶ
第一章 簡介 ………………………………………………………… 1
1.1. 鋰離子電池概論 …………………………………………… 1
1.2. 陽極材料 ………………………………………………… 2
1.3. 電解液 …………………………………………………… 7
1.3.1 Propylene Carbonate (PC) ……………………… 8
1.3.2 Ethylene Carbonate (EC) ………………………… 9
1.3.3 Linear Carbonates …………………………………10
1.4. 陰極材料…………………………………………………… 10
第二章 實驗 ……………………………………………………… 12
2.1. 奈米碳管電極製備與硬幣型電池的組裝 ……………… 12
2.2. 實驗分析設備 …………………………………………… 18
2.2.1 掃描式電子顯微鏡………………………………… 18
2.2.2 拉曼光譜儀………………………………………… 18
2.2.3 X光繞射儀……………………………………………18
2.2.4 表面積測試………………………………………… 19
2.2.5 充放電測試………………………………………… 21
2.2.6 循環伏安法………………………………………… 21
2.2.7 交流阻抗分析……………………………………… 21
第三章 結果與討論………………………………………………… 25
3.1 碳材電極的材料分析…………………………………………… 25
3.1.1 碳極的型態分析(FE-SEM)……………………………… 25
3.1.2 碳極的結構分析(Raman)…………………………………27
3.1.3 碳極的結構分析(XRD)……………………………………29
3.1.4 碳極的表面積測量(BET)…………………………………29
3.2 碳極的電化學分析……………………………………………… 31
3.2.1 充放電測試 (Charging-Discharging test)………… 31
3.2.2 循環伏安測試 (Cyclic Voltammetry measurement)… 34
3.2.3 交流阻抗分析圖譜 (a.c. impedance spectra) ……… 38
第四章 結論 ……………………………………………………… 44
參考文獻……………………………………………………………… 45
參考文獻
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