用快淬工艺制备了Mg2Ni型Mg2-xLaxNi(x=0,0.2)贮氢合金,用XRD、SEM、HRTEM等方法分析了合金的微观结构,结果发现,在快淬无La合金中没有出现非晶相,但快淬含La合金显示了以非晶相为主的结构,表明少量La替代Mg可以显著提高合金的非晶形成能力.电化学测试的结果表明,La替代可显著提高快淬态合金的放电容量、循环稳定性以及高倍率放电能力(HRD),这主要归因于在快淬态合金中形成纳米晶/非晶结构.
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