微量LaNi5合金與機械球磨對Mg3MnNi2合金電化學特性之影響; The study of ball-milling and LaNi5 alloy additive on the electrochemical performances of Mg3MnNi2 alloy

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题名:	微量LaNi5合金與機械球磨對Mg3MnNi2合金電化學特性之影響;The study of ball-milling and LaNi5 alloy additive on the electrochemical performances of Mg3MnNi2 alloy
作者:	郭峻誠;Chun-Cheng Kuo
贡献者:	能源工程研究所
关键词:	鎂基合金電極;機械球磨法;恆溫揮發鑄造法;ball-milling;Mg-based alloy electrode;IECP method
日期:	2011-08-13
上传时间:	2012-01-05 12:25:07 (UTC+8)
摘要:	利用恆溫揮發鑄造法（Isothermal Evaporation Casting Process，IECP）製備Mg3MnNi2合金，藉由機械球磨法與添加微量LaNi5合金，觀察各合金之結構變化與電化學特性之影響。 Mg3MnNi2合金經由機械球磨法減少顆粒及晶粒尺寸，導致比表面積的增加與吸放氫擴散路徑的縮小，進而改善Mg3MnNi2合金放電電容量，球磨30分鐘有最大放電電容量206 mAh/g較鑄態合金提升40 mAh/g，但經球磨過之合金其放電循環壽命則會大幅降低。此外，將球磨30分鐘Mg3MnNi2合金添加 x wt.% LaNi5 (x=10,20及30)合金藉由球磨法形成複合材料，發現隨著LaNi5合金的含量增加，球磨30分鐘Mg3MnNi2合金放電循環壽命隨之提升，球磨30分鐘Mg3MnNi2-30 wt.% LaNi5合金擁有最佳放電電容量與放電循環壽命。 Mg3MnNi2 alloy were prepared by IECP. The Mg3MnNi2 alloy were modified by mechanical ball-milling and LaNi5 alloy additive on the Mg3MnNi2 alloy. The phase structures and electrochemical properties of the ball-milled Mg3MnNi2 alloys and Mg3MnNi2-LaNi5 composites were studied. The surface modification of the alloys by mechanical ball-milling led to improvement of the discharge capacity, due to increment surface area and decrement diffusion length for the desorption of absorbed hydrogen. The ball-milled 30 min of Mg3MnNi2 alloy had the largest discharge capacity 206 mAh/g that was higher than the as-cast Mg3MnNi2 alloy 40 mAh/g, but the ball-milled alloys cycle life decreased obviously. The ball-milled 30 min Mg3MnNi2- x wt.% as-cast LaNi5 (x=10,20 and 30) composites were fabricated by mechanical ball-milling. It was found that the ball-milled 30 min 30 min Mg3MnNi2 alloy increased cycle life with increment the LaNi5 alloy content. And the ball-milled 30 min Mg3MnNi2-30 wt.% as-cast LaNi5 alloy was effectively maintained high discharge capacity and cycle life.
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