Li2MnO3與LiNi1/3Co1/3Mn1/3O2皆為層狀結構，兩者混合能形成充放電區間為2～4.8 V的固溶體富鋰材料Li2MnO3．LiNi1/3Co1/3Mn1/3O2，為一種高伏材料。此材料第一次充放電時將因Li2MnO3氧化脫出Li2O造成不可逆的電容量損失。本實驗討論pH值在共沉法製備富鋰材料前驅體時對電性的影響，此外嘗試使用水熱法與共沉法兩步驟製備活性物質：分別將兩固溶成分Li2MnO3與LiNi1/3Co1/3Mn1/3O2以水熱法與共沉法製備並調整兩製程先後順序，觀察其對電性的影響。研究發現，兩步驟製備法中以先水熱製備Li2MnO3後再共沉法製備LiNi1/3Co1/3Mn1/3O2能降低第一次充放電時的不可逆電容量損失，且具有比直接共沉法製備富鋰材料更好的電容量與循環性能。

Both Li2MnO3 and LiNi1/3Co1/3Mn1/3O2 are layered structure, and they can be mixed to form a solid solution Li2MnO3．LiNi1/3Co1/3Mn1/3O2, which its charge-discharge region between 2 and 4.8 V. This material will release Li2O due to Li2MnO3 irreversible decomposition when voltage are above 4.5 V in the first charge cycle, and that’s the reson for loss of capacity in the first cycle. This experiment is composed by three part. First, I will discuss how the pH value affect the electrochemical performances when preparing Li2MnO3．LiNi1/3Co1/3Mn1/3O2 precursor through co-precipitation method. The second and the third parts will take apart Li2MnO3．LiNi1/3Co1/3Mn1/3O2 into Li2MnO3 and LiNi1/3Co1/3Mn1/3O2. We try to prepare Li2MnO3 and LiNi1/3Co1/3Mn1/3O2 through hydrothermal and co-precipitatio method, respectively, and observe how the order of these two step processes affect the electrochemical performances. In my report,process that using hydrothermal method to prepare Li2MnO3 first then co-precipitaion method to prepare LiNi1/3Co1/3Mn1/3O2 thereafter can lower the capacity loss in the first cycle, and even have higher capacity and better cycle ability comparing to Li2MnO3．LiNi1/3Co1/3Mn1/3O2 prepared by co-precipitation method.

目錄
Abstract I
摘要 II
Acknowledgement III
目錄 V
Chapter 1. 前言 1
Chapter 2. 文獻回顧 3
1.1 能源市場 3
1.2 鋰電池工作原理 8
1.3 正極材料 10
1.3.1 層狀結構材料 10
1.3.2 尖晶石結構材料 12
1.3.3 橄欖石結構材料 14
1.3.4 富鋰材料 15
1.3.4.1 合成方式 15
1.3.4.2 結構、相研究 16
1.3.4.3 電化學特性 19
1.3.4.4 電化學性能改良 20
1.4 研究動機 23
Chapter 3. 實驗步驟 24
1.5 實驗方法 24
1.5.1 共沉法製備x Li2MnO3．(1-x)LiNi1/3Co1/3Mn1/3O2 24
1.5.2 先共沉(LiMO2)後水熱(Li2MnO3)法 25
1.5.3 先水熱(Li2MnO3)後共沉(LiMO2)法 27
1.6 材料鑑定分析 29
1.6.1 X-ray Diffraction (相鑑定) 29
1.6.2 Scanning Electron Microscopy (前驅物形貌) 30
1.6.3 X-ray Photoelectron Spectroscopy (表面元素價態) 30
1.7 材料電化學特性分析 30
1.7.1 製作電極片(塗布、裁片) 30
1.7.2 電池組裝 31
1.7.3 電性測試 (cycle-test) 31
1.7.4 循環伏安測試 31
Chapter 4. 結果與討論 33
1.8 共沉法製備x Li2MnO3．(1-x)LiNi1/3Co1/3Mn1/3O2 33
1.8.1 pH值對製備0.5 Li2MnO3．0.5 LiNi1/3Co1/3Mn1/3O2的影響 33
1.8.1.1 相鑑定 33
1.8.1.2 前驅物形貌 36
1.8.1.3 Li2MnO3．LiNi1/3Co1/3Mn1/3O2表面錳價態 37
1.8.1.4 電性表現 39
1.8.2 改變Li2MnO3與LiNi1/3Co1/3Mn1/3O2的比例 46
1.8.2.1 相鑑定 46
1.8.2.2 前驅物形貌 47
1.8.2.3 電性表現 47
1.9 先共沉製備LiNi1/3Co1/3Mn1/3O2再水熱製備Li2MnO3 54
1.9.1 相鑑定 54
1.9.2 產物形貌 56
1.9.3 Li2MnO3．LiNi1/3Co1/3Mn1/3O2表面錳價態 58
1.9.4 電性表現 60
1.10 先水熱製備Li2MnO3再共沉製備LiNi1/3Co1/3Mn1/3O2 65
1.10.1 相鑑定 65
1.10.2 前驅物形貌 69
1.10.3 Li2MnO3．LiNi1/3Co1/3Mn1/3O2表面錳價態 69
1.10.4 電性表現 72
Chapter 5. 結論 86
參考文獻 88

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