The study on the ultra-light proton exchange membrane fuel cells
|關鍵字:||燃料電池;雙極板;導電鍍膜;膜電極;氫氣瓶;鋰鐵磷正極材料;Fuel cells;Bipolar plate;Conductive coating;MEA;Hydrogen bottle;Cathode material lithium iron phosphate|
傳統雙極板的重量是佔電池組約90%，本研究將塑料(Polymethylmethacrylate, PMMA)以射出成型方法製成流場板，再利用塑料表面金屬化鍍層之研究，探討附著力、抗腐蝕、導電性及解決金屬層龜裂現象。在輕量化氫氣瓶的研發製作上則選用鋁合金材料 (7075-T6)以找出最佳銲接製程參數。膜電極(MEA)穩定製程的研究則以研發觸媒在電極上穩定之塗佈技術。儲電元件將以鋰鐵磷氧化物之煅燒技術製作。
Due to the oil shortage in recent years, the proton exchange membrane fuel cell (PEMFC) system becomes the main source of power in the future. This power system can be used in aircraft, household electricity, agriculture, fishing, motor vehicles, ships, submarines, bicycles and other portable power systems. To solve several existed problems for this PEMFC system such as weight, cost, and integration problems, this study emphasized on the manufacturing of lightweight bipolar plates, design of hydrogen-storage bottle made of aluminum alloy, the stability of manufacturing process of catalyst coating of membrane electrode assembly (MEA), and finally the improvement of manufacturing of materials used for the electricity-stored components. Since the weight of the traditional bipolar plates account for about 90% of the battery pack, an injection molding flow field plate made of polymethylmethacrylate (PMMA), with a metal-based surface coating, was developed. The adhesion, corrosion resistance, electrical conductivity, and cracking phenomenon of this metal-coated layer were examined. In the development of light-weight bottle for hydrogen storage, Taguchi method was used to determine the optimum process parameters of aluminum alloy (7075-T6) welding. The function and stability of MEA were studied mainly on the new-designed manufacturing process of electrode-catalyst coating technique. A new sintering technology was developed to produce lithium-iron-phosphorus oxide used as component of rechargeable batteries. CAE mold flow analysis and FEMLAB analysis were used for the simulation of the experimental design based on finished products. Experimental analysis included metallographic examination, SEM and AFM observation, and several physical and chemical properties analysis. The results indicate that the establishment of the injection mold of CAE simulation can help mold development and reduce the cost. Mechanical coarsening on the surface of PMMA can obtain a better adhesion (all greater than 50 N), in the temperature above 80 ℃, which is suitable for PEMFC system. Hydrogen storage bottle of aluminum alloy can be manufactured by proper welding parameters. New scrape-applied method was developed to improve the electric current stability of the electrode. Finally, new sintering technology based on thermodynamics and fluid mechanics was developed and tested successfully.
|Appears in Collections:||Thesis|
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