Electrochemical properties of CeMg_(11)Ni+x% Ni composites (x=0,50, 100 and 200) prepared by ball-milling  

作　　者：王丽 王新华 陈立新 陈长聘 

机构地区：[1]Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

出　　处：《中国有色金属学会会刊：英文版》2005年第2期366-370,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project (TG2000026406) supported by the National Basic Research Development Program of China; Project (50471042)supported by the National Natural Science Foundation of China

摘　　要：The electrochemical properties of the as-cast CeMg11Ni and ball-milled CeMg11Ni+x% Ni（x=0, 50, 100 and 200, mass fraction） composites were investigated. The results show that homogeneous amorphous phase of CeMg11Ni+x% Ni composite can be obtained by ball-milling, and discharge capacity of the ball-milled CeMg11Ni+x% Ni composites differs greatly depending on the amount of Ni introduced during milling. The CeMg11Ni+200% Ni composite after 90 h ball-milling was found to exhibit a large discharge capacity of about 1 012 mAh/g at 303 K, and it also shows better charge-discharge cycling stability than those with lower Ni content. This remarkable improvement in electrochemical properties of the ball-milled composites seems to be attributed to the formation of an （amorphous） composite as well as the improvement of the surface state of the ball-milled particles.The electrochemical properties of the as-cast CeMg_(11)Ni and ball-milled CeMg_(11)Ni+x% Ni(x=0, 50, 100 and 200, mass fraction) composites were investigated. The results show that homogeneous amorphous phase of CeMg_(11)Ni+x% Ni composite can be obtained by ball-milling, and discharge capacity of the ball-milled CeMg_(11)Ni+x% Ni composites differs greatly depending on the amount of Ni introduced during milling. The CeMg_(11)Ni+200% Ni composite after 90 h ball-milling was found to exhibit a large discharge capacity of about 1 012 mAh/g at 303 K, and it also shows better charge-discharge cycling stability than those with lower Ni content. This remarkable improvement in electrochemical properties of the ball-milled composites seems to be attributed to the formation of an (amorphous) composite as well as the improvement of the surface state of the ball-milled particles.

关 键 词：储氢合金 铈镁11镍合金 无组织相 点化学性质 

分 类 号：TB331[一般工业技术—材料科学与工程]