臺灣博碩士論文加值系統

鈮酸鈦負極材料TiNb2O7 (TNO)，其理論電容量為387 mAh g-1，且有出色的循環性能表現，當鋰離子嵌入嵌出時，材料結構的晶格參數和晶胞體積只有些許的變化，電壓平台約為1.6V，因此在循環過程中不易產生SEI膜和鋰枝晶，但是TNO因為能帶相對較寬(～2.9 eV)，使導離子性及導電性降低，因此導致容量和倍率性能較為不足。為了解決TNO材料的缺點，因此發展出加上碳塗層(例如:石墨、奈米碳管、氧化石墨)、改變結構設計(例如中空結構、介孔結構;較大的比表面積和多孔結構)以及藉由摻雜元素來改善TNO的電化學特性。
本實驗將以溼式化學法摻雜鉻、鑭、釩、銅等不同的元素對TiNb2O7 (TNO)負極材料進行改質。本實驗進行多種元素改質後，發現摻雜微量的鉻元素時，在循環壽命以及循環保持率上都有明顯的提升，而且在倍率性能方面也能有明顯的改善。

The titanium niobate anode material TiNb2O7 (TNO) has a theoretical capacity of 387 mAh g−1 and an excellent cycle life. The lattice parameters and unit cell volume of the material change only slightly when lithium ions are inserted or extracted. However, TNO exhibits poor electronic conductivity because of its wide band gap (approximately 2.9 eV). In the present study, TNO anode material was modified by doping multiple elements (i.e., chromium, lanthanum, vanadium, and copper) using the wet method. The cycle life, coulombic efficiency, and rate performance of the material improved substantially after chromium doping.

摘要............i
Abstract............ii
誌謝............iii
目錄............iv
表目錄............vi
圖目錄............vii
第一章 緒論............1
1.1前言............1
1.2研究動機............1
第二章 文獻回顧............3
2.1鋰離子電池介紹............3
2.1.1鋰離子電池簡介............3
2.1.2鋰離子電池工作原理............3
2.2鋰離子電池組成............4
2.2.1正極材料............4
2.2.2隔離膜............6
2.2.3電解液............7
2.2.4負極材料............7
2.3鈮酸鈦(TNO)負極材料文獻回顧............9
2.3.1 Ti2Nb10O29負極材料............9
2.3.2以溶膠凝膠法合成TiNb2O7負極材料............10
2.3.3以固態反應法合成TiNb2O7負極材料............12
2.3.4以水熱法合成TiNb2O7負極材料............16
2.3.5奈米複合微米結構TiNb2O7 ............20
2.3.6多孔性TiNb2O7............23
2.3.7以石墨烯改質TiNb2O7 ............26
2.3.8以釩元素改質TiNb2O7 ............30
2.3.9以Cu2+/Nb5+共摻雜改質TiNb2O7............33
第三章 實驗材料與方法............36
3.1 實驗材料與設備............36
3.1.1實驗材料............36
3.1.2實驗設備............36
3.2 實驗流程............37
3.2.1鈮酸鈦負極材料的改質方法............38
3.2.2負極材料的混漿及塗佈 ............39
3.2.3負極材料的輾壓及打片............39
3.2.4鋰離子電池組裝............40
3.3實驗分析儀器............41
第四章 實驗結果與討論............45
4.1 TiNb2O7摻雜改質元素............46
4.1.1 XRD繞射結果分析............46
4.1.2粒徑分佈分析............49
4.1.3表面形貌與元素分佈(mapping)分析............55
4.1.4倍率性能(C-Rate)測試............62
4.1.5共摻雜倍率性能(C-Rate)測試............67
4.1.6循環性能(Cycle)測試............70
4.1.7共摻雜循環性能(Cycle)測試............75
4.1.8循環伏安測試............77
4.1.9交流阻抗測試............79
第五章 結論............81
未來展望............82
參考文獻 ............83
Extended Abstract............87

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