在新興電池系統中，鋰硫電池因為其高電容量和價格低廉而相當具有發展潛力。但儘管擁有上述作為良好電池系統的優點，卻仍存在些許致命性的問題如硫的絕緣性，及多硫化物流失於電解液中的硫梭效應，因此如何解決上述問題成為目前研究的主要方向。
近年來，許多研究團隊提出許多不同的方式減緩硫梭效應以期提升鋰硫電池的電性表現及循環壽命，目前最主流的方式為透過催化效應減緩長鍊多硫化物溶於電解液中，如此可降低在充放電過程中的活物損失，提升庫倫效率，達到延長電池壽命以及良好的電性表現。
本篇文獻主要透過鈷金屬原子對多硫化物的催化效應，合成鈷和導電碳的複合材料作為添加劑，鈷金屬除了能改善硫的導電性問題外，其催化效應也可幫助鋰硫電池有更好的電性表現。除此之外，鈷金屬與含氟電解液在充放電時有助於促進在極片上生成氟化鋰，氟化鋰也同樣具有抑制硫梭效應的功能，並且同時可幫助鋰離子傳導。經過此複合材料改質後在高速率充放電（5 C）無論在電容量及循環壽命上皆有相當優異的結果。

Among the candidates to the next-generation energy storage system, Li-S batteries exhibit lots of advantages, such as high theoretical specific energy and low cost. However, their practical applications are prohibited by the low conductivity of sulfur and the shuttle effect of lithium polysulfide.
Recently, studies on Li-S batteries have widely focused on the initial Sulfur (S8) - soluble polysulfide – Li2S conversion reaction, which contributes to above the 50 % of the theoretical capacity of Li-S batteries. Nonetheless, the slow conversion kinetics between the intermediate product (lithium polysulfide) and the final product (Li2S) leads to lots of active materials loss, which cause low columbic efficiency, low sulfur utilization, and low discharge capacity.
To overcome the aforementioned problems, a readily available cobalt embedded carbon composite is investigated. The cobalt deposited on carbon composite is synthesized by a chemical nucleation method. This new designed composite is shown to promote the electron and ion conductivity, which mitigates the dissolution of polysulfide that causes shuttle effect. Furthermore, cobalt will also react with fluorine-containing electrolyte to form lithium fluoride in the cathode during the charging and discharging process, which enhances the high c-rate performance of the battery. The battery with cobalt-carbon composites delivers about 580 mA h g-1 at 5 C, and remains at 543 mA h g-1 after 200 cycles.

Abstract...2
摘要...4
致謝...5
第一章 緒論...11
1.1 能源技術與鋰離子電池之發展...11
第二章 文獻回顧...17
2.1 鋰硫電池及硫複合材...17
2.2 吸附與催化材料與硫複合材...22
2.2-1 過度金屬化合物及其應用...23
2.2-2 金屬有機網絡材料（ MOFs）及其應用...25
2.2-3 單質金屬催化效應及其應用...26
2.3 含氟電解液與氟化鋰於鋰硫電池之應用...32
第三章 實驗步驟...35
3.1 實驗藥品...35
3.2 材料製備...36
3.2-1 硫-科琴黑（KBS）碳硫複合材之合成...36
3.2-2 導電碳官能化實驗...37
3.2-3 鈷碳複合材製備實驗...37
3.3 電極片製備...38
3.4 鈕扣電池組裝製程...39
3.5 材料分析與電性檢測儀器...41
3.5-1 X光粉末繞射儀...41
3.5-2場發式掃描電子顯微鏡...41
3.5-4 循環伏安法( Cyclic voltammetry, CV )...42
3.5-6 電池充放電循環壽命測試...43
第四章 結果與討論...44
4.1 碳硫複合材 Ketjen Black-S Composite (KBS)...44
4.1-1碳硫複合材顯微結構分析...44
4.1-2 碳硫複合材硫含量與X-ray分析...45
4.2 鈷碳複合材（Acidic-Super P-Co）製備與分析...48
4.2-1鈷碳複合材之還原溫度...48
4.3 鋰硫電池以鈷碳複合材進行取代之電性討論...52
4.3-1極片於充放電前之表面形貌...52
4.3-2循環壽命測試...54
4.3-3交流阻抗測試...58
4.3-4循環伏安法測試...60
4.3-5循環後極片表面分析...61
第五章 結論...67
第六章 未來展望...68
第七章 參考資料...69

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