Electrochemical Properties of CeMg12+x%Ni Composites (x=0～200) Prepared by Ball-Milling

稀土学报(英文版), 2005, 23(3): 382-385.

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1.Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

2.Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

3.Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

4.Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

基金项目: 国家自然科学基金(50471042) 国家重点基础研究发展计划(973计划)(TG2000026406)

Electrochemical Properties of CeMg12+x%Ni Composites (x=0～200) Prepared by Ball-Milling

Keywords： hydrogen storage alloy

The electrochemical properties of the as-cast and ball-milled CeMg12+x%(mass fraction) Ni (vs. CeMg12) (x=0, 50, 100 and 200) composites were investigated. The microstructure and discharge capacity of the ball-milled CeMg12+x%Ni composites differ greatly depending on the amount of Ni introduced during ball-milling. The more nickel powder added, the more advantageous for the formation of the amorphous structure. And the discharge capacities of the ball-milled composites increase with increasing amount of nickel added. After 90 h ball-milling, the CeMg12+200% Ni composite exhibits a high discharge capacity of 1170 mAh·g-1(CeMg12)-1 at 303 K. The improvement of electrochemical capacity is attributed to the formation of a homogeneous amorphous structure as well as the modification of the surface state after Ni addition.

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Electrochemical Properties of CeMg12+x%Ni Composites (x=0～200) Prepared by Ball-Milling

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