臺灣博碩士論文加值系統

LiNi0.8Co0.1Mn0.1O2 (NCM811)具有成本低、能量密度高等優點，近期為了增加材料的應用層面，因此將NCM811充電截止電壓由4.2V提高至4.5V以提升能量密度為主流趨勢。但電壓的增加會造成材料結構的崩壞使循環壽命快速下降。為了解決高鎳材料的高電壓所存在的問題，許多文獻已經發表以離子摻雜、表面包覆等方式來改善此材料的缺點。本研究將討論不同改質元素對正極材料的電化學性能影響，同時也探討以相同改質元素，但不同改質方式對材料的影響，期望能提升NCM811在4.5V高電壓的充放電性能及循環壽命。

LiNi0.8Co0.1Mn0.1O2 (NCM811) has the advantages of low cost and high energy density. Recently, in order to extend the applications of the cathode materials, the cut-off voltage of NCM811 is raised from 4.2V to 4.5V to increase energy density. However, the increase in voltage causes a collapse of the material structure and makes a rapid decadence in cycle life. In order to improve the electrochemical properties in high voltage of LiNi0.8Co0.1Mn0.1O2, many literatures have published the different methods, such as ion doping, surface coating, etc. This study will discuss the effects of different doping elements in high nickel cathode on the electrochemical performance, and also compare the efficacies between the different modification methods. It is expected to fine an effective methode and a better dopant to improve the charge and discharge performance and cycle life of NCM811 at 4.5V high voltage.

摘要·······························································…····i
Abstrace··································································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 鋰離子電池及工作原理介紹···········································3
2.2 鋰離子電池的特性···················································4
2.3 負極材料···························································6
2.3.1 負極材料的分類···················································7
2.4 隔離膜·····························································8
2.5 電解質·····························································9
2.6 三元正極材料的製備工藝 ···········································10
2.7 正極材料··························································11
2.7.1正極材料微觀結構·················································12
2.7.2 層狀LiCoO2正極材料·············································12
2.7.3層狀LiNiO2正極材料··············································14
2.7.4層狀LiMnO2正極材料··············································15
2.7.5尖晶石結構LiMn2O4正極材料 ······································16
2.7.6橄欄石結構LiFePO4正極材料·······································17
2.7.7層狀結構 Li [Ni1-x-y Co x Mny] O 2 三元正極材料························18
2.7.8 LiNi0.8Co0.1Mn0.1O2通過Y改質······································20
2.7.9 LiNi0.8Co0.1Mn0.1O2通過Li3PO4 Coating改質···························22
第三章 實驗材料與方法····················································24
3.1材料與儀器························································24
3.2實驗流程··························································26
3.3正極材料的改質方法················································27
3.4正極材料的燒結處理················································28
3.5正極材料的混漿及塗佈··············································29
3.6正極極板的碾壓及打片··············································30
3.7鋰離子電池組裝····················································31
3.8物理及化學特性測試流程············································32
3.8.1 X射線繞射儀（X-ray diffractometer，XRD）···························32
3.8.2掃描式電子顯微鏡(Scanning Electron Microscope，SEM) ················32
3.8.3充放電機(Battery Automation Test Systems) ····························32
3.8.4交流阻抗(Electrochemical Impedance Spectroscopy，EIS) ·················33
第四章 結果與討論························································34
4.1以Ni0.8Co0.1Mn0.1(OH)2為主體，進行固態混合改質···················34
4.1.1 OH系列正極材料物性檢測·········································34
4.1.2 OH系列正極材料電化學特性檢測···································36
4.1.2.1不同充放電速率測試·············································37
4.1.2.2充放電循環測試·················································39
4.2以LiNi0.8Co0.1Mn0.1O2為主體，進行噴霧造粒改質························41
4.2.1DI系列正極材料物性檢測···········································41
4.2.2DI系列正極材料電化學特性檢測·····································44
4.3以LiNi0.8Co0.1Mn0.1O2為主體，於異丙醇環境進行改質····················47
4.3.1IP系列正極材料物性檢測···········································48
4.3.2IP系列正極材料電化學特性檢測·····································52
4.3.2.1不同充放電速率測試·············································52
4.3.2.2充放電循環測試·················································57
4.3.2.3交流阻抗測試···················································59
第五章 結論······························································61
參考文獻·································································64
Extended Abstract··························································67

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