- 學位論文
浸塗法製備活性碳電極及其於超高電容器之應用
Synthesis, Characterization, and Application of Activated Carbon for The Electrodes In Supercapacitors
摘要
本文使用發泡鎳作為電雙層電容器之集電層，並將此集電層浸塗碳材料，待碳材料固化後，將此含有碳材料之集電層碾壓不同厚度(2mm、1mm、0.5mm)，製造出不同結構之電極材料，並製成電雙層電容器。在同樣含碳量、不同集電層厚度的電極內，使含活性碳之發泡鎳內部間隙結構不同，探討其物性及電性分析。 此不同結構發泡鎳之超級電容電極，使用SEM、TEM分析其微觀結構；再將不同電極組製作為超級電容模組，再針對其電性測試，包含定電流充放電測試、循環伏安法與交流阻抗測試，進行比電容值、交流阻抗圖譜分析與長時間穩定性測試。 此研究將分別使用不同結構發泡鎳電極與平板電極比較，使用循環伏安法量測電容值，使用掃描速率2 mV/s、範圍為1.0 V~-1.0 V，其電容表現平板電極為88 F/g，碾壓不同厚度(2 mm、1 mm、0.5 mm)之電極其電容表現分別為84 F/g、93 F/g、139 F/g；並使用定電流(10 mA)充放電至1.0 V作5000次長時間循環測試，其電容維持率達99%以上。
並列摘要
In this study, the carbon material arrays freely standing on nickel foam are prepared via the impregnation treatment method. The thickness of the current collector layer handled by this roller mill is 2 mm, 1 mm, 0.5 mm, respectively. The supercapacitor was prepared by electrode of different structure. This study will discuss physical property and electrical performance analysis under the same carbon content and different thickness of the current collector layer. The surface morphology of electrodes were analyzed using a scanning electron microscope and transmission electron microscope. The specific-capacitance, electrochemical impedence spectroscopy and long time stability test of supercapacitors were analyzed using the charge/discharge test, cyclic voltammetry, ac impedance test. The capacitance measurements with two electrodes, which were working and counter electrodes, as a function of applied potential in the range of +1.0 V to -1.0 V were carried out using a computer-controlled potentiostat. The sweep rate of applied potential was set at 5 mV/sec. The capacitance of and plate electrode was 88 F/g. The capacitance of different thickness (2mm、1mm、0.5mm) of nickel foam is 84 F/g, 93 F/g, 139 F/g. The cycle life after 5 mV/sec CV test 5,000 times still maintain at 99%.