Electrochemical Properties of CeMg12+x%Ni Composites (x=0～200) Prepared by Ball-Milling
来源期刊：JOURNAL OF RARE EARTHS2005年第3期
论文作者：Wang Li Xiao Xuezhang Wang Xinhua Chen Changpin
Key words：hydrogen storage alloy; CeMg12; amorphous; ball-milling; electrochemical properties;
Abstract: 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.
Wang Li1，Xiao Xuezhang1，Wang Xinhua1，Chen Changpin1
(1.Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)
Abstract: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.
Key words:hydrogen storage alloy; CeMg12; amorphous; ball-milling; electrochemical properties;
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