【作者】 陈长聘； 陈昀； 王丽； 王新华； 陈立新；

【Author】 Chen Changpin, Chen Yun, Wang Li, Wang Xinhua, Chen Lixin ( College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, China)

【机构】 浙江大学材料与化工学院；

【摘要】 研究了La2Mg17型与CeMg12型稀土-镁系合金加镍球磨的非晶化转变及其对微结构和电化学储氢特性的影响。添加Ni粉球磨显著促进了铸态合金和镍粉非晶化的形成以及合金颗粒的微细化。当Ni粉添加量达到100%时两种类型合金均转变为均匀非晶结构。经50h球磨的La2Mg17+100%Ni非晶合金的放电容量达到1060mAh·g-1(La2Mg17),而球磨CeMg12+200%Ni的非晶合金达到1170mAh·g-1(CeMg12)。关联微结构与电化学特性的关系发现,稀土-镁合金的电化学储氢特性除与非晶化程度和颗粒尺寸有关外还与非晶合金的微结构密切相关。更多还原

【Abstract】 The effect of ball milling and Ni addition on the formation of homogeneous amorphous, microstructureand electrochemical characteristics of La2Mg17-type and CeMg12-type alloys were investigated. The addition of Ni powder remarkably enhances the formation of amorphous composites and the pulverization of particles. The two types of alloy with 100% Ni added can be completely amorphorized. After 50 h ball-milling the amorphous La2Mg17 + 100% Ni com- posite exhibits a large discharge capacity of 1060 mAh ·g-1(La2Mg17) at 293 K, whereas the amorphous CeMg12+200% Ni composite reaches 1170 mAh·g-1 (CeMg12) at 303 K after 90 h ball-milling. The analysis of the relationship between the microstructure and electrochemical properties show that aside from the degree of amorphorization and particle sizes, the electrochemical properties also closely relate with the microstructureof amorphous composite.更多还原