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研究生:施岳廷
研究生(外文):Yueh-TingShih
論文名稱:Si-xAl薄膜負極在室溫及55℃之電化學性質及結構特性探討
論文名稱(外文):The Electrochemical Properties and Structural Characteristics of Si-xAl Thin Film Anode at Room Temperature and 55℃
指導教授:呂傳盛呂傳盛引用關係陳立輝陳立輝引用關係
指導教授(外文):Truan-Sheng LuiTruan-Sheng Lui
學位類別:碩士
校院名稱:國立成功大學
系所名稱:材料科學及工程學系碩博士班
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:48
中文關鍵詞:Si-Al充放電鋰離子電池負極材料
外文關鍵詞:Si-Alcharge-dischargelithium ion batteryanode material
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本實驗利用射頻磁控濺鍍法製備Si-xAl薄膜負極材料,不同含量的鋁(Si-8Al, Si-23Al, Si-43Al (at.%))被添入矽基地中做為緩衝物,以減緩矽薄膜在嵌鋰-脫鋰過程中劇烈的體積膨脹。實驗中探討Si-xAl薄膜負極材料在室溫及高溫(55℃)的電化學性質及其結構特性。
實驗結果指出,當矽基地中鋁含量增加時,鋰離子將由與Si-Al共同反應轉變為僅與鋁反應。與室溫相較,在55℃環境充放電時,增加的嵌鋰-脫鋰反應量會造成電容量的上升,但伴隨而來劇烈的體積膨脹,將造成循環穩定性的降低。除此之外,在55℃充放電測試過程中Si-23Al薄膜會有結晶化現象產生。
經由電化學阻抗(EIS)分析也發現,在室溫時,Si-8Al與Si-23Al電化學反應阻抗的差異是由電荷轉移過程所主導,而55℃時則是由鋰離子在材料中的擴散所主導。
In this study, Al was added into Si matrix as the buffer (Si-8Al, Si-23Al, Si-43Al) by RF magnetron sputtering to prevent the dramatic volumetric expansion of pure Si thin film anode during lithiation and delithiation. The electrochemical properties and structural characteristics of Si-xAl films at room temperature and high temperature (55℃) were investigated.
As the addition content of Al in Si matrix increase, lithium ions react with Al only instead of both Al and Si. At 55℃, the higher lithiation and delithiation quantity accompanied a dramatic volumetric expansion which increased the capacity but degraded the stability, besides the Si-23Al thin film was occurred crystallization during charge-discharge.
According to the EIS results, the resistances against electrochemical reactions of Si-8Al and Si-23Al are controlled by diffusion of lithium ions in the anode materials at high temperature while charge transfer process at room temperature.
中文摘要……………………………………………………………………...I
英文摘要……………………………………………………………………...II
致謝……………………………………………………………….…………..III
總目錄………………………………………………………………………...IV
表目錄…………………………………...…………………………………...VII
圖目錄………………………...……………………………..……………...VIII
第一章 緒論…………………………………………………………………...1
1-1 鋰離子電池簡介……………………………………………………..1
1-2 研究目的……………………………………………………………..2
第二章 文獻回顧……………………………………………………………...5
2-1 鋰離子電池之負極材料……………………………………………..5
2-2 矽負極材料…………………………………………………………..5
2-2-1 矽薄膜負極材料……………………………………………...6
2-2-2 額外元素添加………………………………………………...6
2-3 Si-Al負極材料………………………………………………………..7
第三章 實驗方法……………………………………………………………...8
3-1 負極極片之製備……………………………………………………..8
3-2 電化學性質分析……………………………………………………..8
3-2-1 電池組裝……………………………………………………...8
3-2-2 充放電測試…………………………………………………...8
3-2-3 循環伏安(Cyclic Voltammetry, CV)分析……………………9
3-2-4 電化學阻抗(Electrochemical Impedance Spectroscopy, EIS)
分析….………………………………………………………..9
3-3 電極片結構分析……………………………………………………..9
3-3-1 掃描式電子顯微鏡(SEM)觀察………………………………9
3-3-2 低角度X-ray繞射(Grazing Incidence X-ray Diffraction,
GI-XRD)分析………………………………………………..9
3-3-3 高解析穿透式電子顯微鏡觀察(HR-TEM)及擇區繞射
(SAED)分析………………………………………………..10
第四章 結果………………………………………………………………….13
4-1 電化學性質…………………………………………………………13
4-1-1 Si-xAl薄膜負極材料之室溫充放電結果…………...……...13
4-1-2 Si-xAl薄膜負極材料之55℃充放電結果…...……………...13
4-1-3 不同溫度下Si-8Al及Si-23Al薄膜負極材料之循環伏安
分析結果……………..………………………………….......14
4-1-4 不同溫度下Si-8Al及Si-23Al薄膜負極材料之電化學阻
抗分析結果……………………....…………………….......15
4-2 結構特性……………………………………………………………16
4-2-1 55℃充放電測試後Si-xAl薄膜負極材料之SEM分析結
果……..………………………………………….…………..16
4-2-2 初鍍膜及不同溫度充放電測試後Si-23Al薄膜負極材料
之GI-XRD分析結果…..……….….……………..…………16
4-2-3 不同溫度充放電測試後Si-23Al負極材料之TEM分析
結果..………………..……………………………………….16
第五章 討論……..…………………………………………………………...37
5-1 鋁添加量對Si-xAl薄膜負極材料充放電特性之影響……………37
5-2 充放電測試溫度對Si-xAl薄膜負極材料充放電特性之影響……38
5-3 Si-23Al薄膜負極材料充放電過程中結晶化之機制探討………38
第六章 結論……………………………………………………………...44
參考文獻……………………………………………………………………...45

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