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低钴储氢合金Ml0.9Mg0.1Ni3.4Co0.3Al0.3电化学性能研究
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TG139.7

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国家教育部科技重点项目(104266)


Study on the Electrochemical Properties of Low-Cobalt Ml0.9Mg0.1Ni3.4Co0.3Al0.3 Hydrogen Storage Alloy
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    摘要:

    为了降低AB5犁储氢合金的成本,对低钴的Ml0.9Mg0.1Ni3.4Co0.3Al0.3合金的组织结构和性能进行了研究,并与工业储氢合金MmNi3.55Co0.75Mn0.4Al0.3进行了对比。实验结果表明:此低钴合金是由LaNi5主相和LaNi3第二相构成。它们的储氢晕(ω,%)分别为1.36%和1.37%,最大放电容量分别为320mAh/g和324mAh/g,循环稳定性为:300次充放电循环后,2种合金剩余容晕都是88%。但Ml0.9Mg0.1Ni3.4Co0.3Al0.3的高倍率放电性能明显优于MmNi3.55Co0.75Mn0.4Al0.3合金。主要原因是由于LaNi3第二相的乍成不仪提高了合金颗粒表面的电化学催化活性,而且提高了结构韧性从而抵消了低钴合金颗粒粉化的不利影响。

    Abstract:

    For decreasing the cost of AB_5-type hydrogen storage alloys, a low-cobalt Ml_(0.9)Mg_(0.1)Ni_(3.4)Co_(0.3)Al(0.3) alloy was investigated by examining the alloy structure, phase composition and some properties. Its properties were compared with those of a commercial alloy MmNi_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3). The experiments' outcome shows that the low-cobalt alloy is composed of Mg-free LaNi_5 phase as matrix and Mg-contained LaNi3 phase as secondary phase. The hydrogen storage capacity (1.36wt% and 1.37wt% respectively), the greatest discharge capacity (320 mAh/g and 324 mAh/g respectively) and cycling stability (the residual capacity of two alloys is all 88% ) of Ml_(0.9)Mg_(3.4)Ni_(3.4)Co(0.3)Al_(0.3) are as good as those of MmNi_(3.55)Co(0.75)Mn(0.4)Al_(0.3). However, after the discharge current density exceeds 300 mA/g, the high-rate discharge abilities (HRD) of Ml_(0.9)Mg_(0.1)Ni_(3.4)Co_(0.3)Al_(0.3) are apparently better than those of MmNi_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3).It is because there exists Mg-contained LaNi_3 phase as secondary phase which improves the electrochemical catalytic activity of alloy particles surface and the structure toughness of alloy particles.

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魏学东 唐睿 朱杰武 柳永宁 于光.低钴储氢合金Ml0.9Mg0.1Ni3.4Co0.3Al0.3电化学性能研究[J].稀有金属材料与工程,2005,34(12):1866~1870.[Wei Xuedong, Tang Rui, Zhu Jiewu, Liu Yongning, Yu Guang. Study on the Electrochemical Properties of Low-Cobalt Ml0.9Mg0.1Ni3.4Co0.3Al0.3 Hydrogen Storage Alloy[J]. Rare Metal Materials and Engineering,2005,34(12):1866~1870.]
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  • 收稿日期:2004-08-10
  • 最后修改日期:2005-09-15
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