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低鈷儲(chǔ)氫合金Ml0．9Mg0．1Ni3．4Co0．3Al0．3電化學(xué)性能研究
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TG139.7

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國(guó)家教育部科技重點(diǎn)項(xiàng)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:

    為了降低AB5犁儲(chǔ)氫合金的成本，對(duì)低鈷的Ml0．9Mg0．1Ni3．4Co0．3Al0．3合金的組織結(jié)構(gòu)和性能進(jìn)行了研究，并與工業(yè)儲(chǔ)氫合金MmNi3.55Co0.75Mn0.4Al0.3進(jìn)行了對(duì)比。實(shí)驗(yàn)結(jié)果表明：此低鈷合金是由LaNi5主相和LaNi3第二相構(gòu)成。它們的儲(chǔ)氫暈（ω,％）分別為1．36％和1．37％，最大放電容量分別為320mAh／g和324mAh／g，循環(huán)穩(wěn)定性為：300次充放電循環(huán)后，2種合金剩余容暈都是88％。但Ml0．9Mg0．1Ni3．4Co0．3Al0．3的高倍率放電性能明顯優(yōu)于MmNi3．55Co0．75Mn0．4Al0.3合金。主要原因是由于LaNi3第二相的乍成不儀提高了合金顆粒表面的電化學(xué)催化活性，而且提高了結(jié)構(gòu)韌性從而抵消了低鈷合金顆粒粉化的不利影響。

    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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魏學(xué)東 唐睿 朱杰武 柳永寧 于光.低鈷儲(chǔ)氫合金Ml0．9Mg0．1Ni3．4Co0．3Al0．3電化學(xué)性能研究[J].稀有金屬材料與工程,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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