(浙江大學材料科學與工程系， 杭州 310027)
摘 要: 采用在Ml(NiCoMnTi)5合金中添加不同量鎂的方法， 系統(tǒng)地研究了鎂摻雜量對貯氫電極合金Ml(NiCoMnTi)5電化學性能的影響。 結果表明， 當鎂摻雜量從0.003%增加至0.263%時， 合金的最大放電容量逐漸升高， 但當鎂摻雜量進一步增加時， 合金的最大放電容量又逐漸降低； 增加鎂摻雜量可以改善合金的活化性能， 而且隨著鎂摻雜量的增加合金的高倍率放電性能也有不同程度的提高， 但合金的24h荷電保持能力卻大幅度下降； 此外， 增加鎂摻雜量會明顯惡化合金的充放電循環(huán)穩(wěn)定性。
關鍵字: 鎂摻雜 貯氫電極合金 電化學性能
（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
