高電壓的陰極材料Li2CoPO4F，具有高理論電容量可達287 mAh/g。本實驗先以溶膠凝膠法合成出LiCoPO4，再加入LiF並以固態燒結法合成出Li2CoPO4F，主要探討改變LiCoPO4的製程條件和Li2CoPO4F的燒結條件時，對Li2CoPO4F電性表現的影響。
第一部份為改變LiCoPO4的製程條件，分成四系列：不同化學配比之LiCoPO4；不同鐵離子取代量之LiCoPO4；不同預燒溫度之LiCoPO4；不同預燒溫度之LiCoPO4進行木寡糖包覆與否。第二部份為改變Li2CoPO4F的燒結條件，分成兩系列：不同燒結溫度之Li2CoPO4F；不同燒結時間之Li2CoPO4F。
在本實驗各製程參數的Li2CoPO4F當中，首圈放電電容量最高的是－預燒溫度為420 oC的LiCoPO4所製得的Li2CoPO4F，可達140 mAh/g；而前15圈平均放電電容量最高的是－預燒溫度為500 oC的LiCoPO4進行糖包覆所製得的Li2CoPO4F，約為89.5 mAh/g。本實驗也得到Li2CoPO4F燒結條件的結論：700 oC為最佳的燒結溫度，且在700 oC的燒結溫度下，燒結時間在1.5 ~ 12小時之間變動時，結果差異不大。

Li2CoPO4F, a high-voltage cathode material which has high theoretical capacity of 287 mAh/g. This study used sol-gel method to synthesize LiCoPO4 and then used solid-state method to synthesize Li2CoPO4F with LiF, controlling the synthetical conditions of LiCoPO4 and Li2CoPO4F to explore the effects on electrochemical performance. First, we altered some experimental parameters of synthesizing LiCoPO4 in four series, including matrix composition, iron ion replacement, sintering temperature and whether coating xylooligosaccharide or not. Second, we altered some experimental parameters of synthesizing Li2CoPO4F in two series, including sintering temperature and time.
In this study, among the first cycle discharge capacity of all, Li2CoPO4F made by 420 oC sintering LiCoPO4 has the highest value of 140 mAh/g；among the average discharge capacity of 1 ~ 15 cycles of all, Li2CoPO4F made by 500 oC sintering xylooligosaccharide-coated LiCoPO4 has the highest value of 89.5 mAh/g. The experimental results also indicate that 700 oC is the best sintering temperature, and the consequences are almost the same when sintering time varies in 1.5 ~ 12 hours at 700 oC.

第一章 緒論.......................................................1
1.1 電池的重要性...............................................1
1.2 電池的種類.................................................3
1.3 鋰離子電池.................................................3
1.4 聚陰離子型電池.............................................6
1.5 研究動機...................................................6
1.6 鋰離子電池的工作原理.......................................8
第二章 文獻回顧..................................................10
2.1 材料結構..................................................10
2.2 電性特徵..................................................11
2.3 合成方法..................................................19
2.3.1 固態燒結法............................................19
2.3.2 溶膠凝膠法............................................21
2.3.3 溶膠凝膠法＋固態燒結法................................24
2.4 電性改良..................................................25
2.4.1 減小顆粒尺寸..........................................25
2.4.2 碳包覆................................................28
2.4.3 保護層包覆............................................30
2.4.4 控制表面形貌..........................................30
2.4.5 表面改質..............................................31
2.4.6 電解液添加物..........................................31
第三章 實驗步驟..................................................33
3.1 Li2CoPO4F的合成..........................................33
3.2 Li2CoPO4F的合成參數調變..................................38
3.3 陰極製備..................................................41
3.4 電池組裝..................................................42
3.5 循環伏安法測試............................................43
3.6 循環壽命測試..............................................43
3.7 X -光繞射分析.............................................44
3.8 掃描式電子顯微鏡..........................................44
3.9 熱重/熱差分析.............................................44
第四章 結果與討論................................................45
4.1 Li2CoPO4F的基本製程......................................45
4.1.1 LiCoPO4前驅物的熱處理................................45
4.1.2 LiCoPO4以及Li2CoPO4F的燒結..........................49
4.1.3 氧化還原峰的檢測......................................51
4.1.4 不同充電截停電壓的電性表現............................52
4.2 改變化學配比..............................................56
4.2.1 X -光繞射分析.........................................57
4.2.2 微結構分析............................................60
4.2.3 循環壽命測試..........................................61
4.3 鐵離子取代................................................62
4.3.1 X -光繞射分析.........................................63
4.3.2 微結構分析............................................66
4.3.3 循環壽命測試..........................................67
4.4 改變LiCoPO4的預燒溫度....................................68
4.4.1 X -光繞射分析.........................................68
4.4.2 微結構分析............................................70
4.4.3 碳含量分析............................................71
4.4.4 循環壽命測試..........................................75
4.5 木寡糖包覆................................................78
4.5.1 X -光繞射分析.........................................78
4.5.2 微結構分析............................................82
4.5.3 EDX分析.............................................84
4.5.4 碳含量分析............................................85
4.5.5 循環壽命測試..........................................86
4.6 改變Li2CoPO4F的燒結溫度..................................93
4.6.1 X -光繞射分析.........................................93
4.6.2 微結構分析............................................94
4.6.3 循環壽命測試..........................................95
4.7 改變Li2CoPO4F的燒結時間..................................98
4.7.1 X -光繞射分析.........................................98
4.7.2 微結構分析............................................99
4.7.3 循環壽命測試.........................................101
第五章 結論.....................................................102
第六章 參考文獻.................................................105

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