(浙江大学材料科学与工程系， 杭州 310027)
摘 要: 采用在Ml(NiCoMnTi)5合金中添加不同量镁的方法， 系统地研究了镁掺杂量对贮氢电极合金Ml(NiCoMnTi)5电化学性能的影响。 结果表明， 当镁掺杂量从0.003%增加至0.263%时， 合金的最大放电容量逐渐升高， 但当镁掺杂量进一步增加时， 合金的最大放电容量又逐渐降低； 增加镁掺杂量可以改善合金的活化性能， 而且随着镁掺杂量的增加合金的高倍率放电性能也有不同程度的提高， 但合金的24h荷电保持能力却大幅度下降； 此外， 增加镁掺杂量会明显恶化合金的充放电循环稳定性。
关键字: 镁掺杂 贮氢电极合金 电化学性能
（Department of Materials Science and Engineering,Zhejiang University, Hangzhou 310027, P. R. China
）
Abstract:The effects of doped magnesium content on electrochemical properties of Ml(NiCoMnTi)5 hydrogen storage electrode alloy were systematically studied. The results showed that the discharge capacity is improved by increasing the magnesium content in the alloy from 0.003% to 0.263%, however, as the magnesium content increases from 0.263% to 1.090%, the capacity decreases gradually. As the magnesium content increases, the activation behaviour and high-rate-dischargeability are enhanced to some degree, but the self-discharge rate of the alloy increases strongly. It was found that the cycling stability is rapidly deteriorated as the magnesium content increases.
Key words: Mg doping hydrogen storage electrode alloy electrochemical property
