用快淬工艺制备了纳米晶和非晶Mg2Ni型Mg2 -xLaxNi (x=0,0.2,0.4,0.6)贮氢电极合金,获得长度连续,厚度约为30μm,宽度约为25 mm的薄带.用XRD、SEM和HRTEM分析了快淬合金薄带的微观结构,测试了合金薄带的电化学性能及电化学交流阻抗谱(EIS).快淬无La合金具有典型的纳米晶结构,但快淬含La合金显示了以非晶相为主的结构,表明La替代Mg2 Ni中Mg元素提高了合金的非晶形成能力.当x≤0.2时,La替代Mg不改变合金的主相Mg2 Ni,但出现少量的LaMg3及La2 Mg17相.当La替代量x≥0.4时,合金的主相改变为(La,Mg) Ni3+ LaMg3.铸态合金的放电容量随La含量的增加单调递增,快淬态合金的放电容量随La含量的变化而出现极大值.La替代Mg显著地提高了铸态及快淬态合金的循环稳定性.
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