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La2Mg0.9Al0.1Ni7.5-xCo1.5Mnx貯氫合金的相結(jié)構(gòu)和電化學(xué)性能
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Phase Constitution and Electrochemical Characteristics of La2Mg0.9Al0.1Ni7.5-xCo1.5Mnx Hydrogen Storage Alloys
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National Natural Science Foundation of China (50171021); Natural Science Foundation of Gansu Province (YS031-A21-008)

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    摘要:

    研究了Mn替代Ni對La2Mg0.9Al0.1Ni7.5-xCo1.5Mnx (x=0, 0.3, 0.6, 0.9)貯氫合金相結(jié)構(gòu)和電化學(xué)性能的影響。XRD Rietveld全譜擬合分析表明：Mn替代改變了合金的物相組成和物相的豐度。LaNi3相消失，αLa2Ni7相豐度的變化表現(xiàn)為先增加(x=0，0.3)后減少(x=0.6，0.9)，LaMgNi4相和La5Ni19相的豐度則隨合金中Mn含量x的增加而增加。Mn替代Ni降低了合金的貯氫容量、最大電化學(xué)放電容量和活化性能，La2Mg0.9Al0.1Ni7.2Co1.5Mn0.3 合金電極表現(xiàn)出最好的電化學(xué)循環(huán)穩(wěn)定性，合金的高倍率放電性能隨Mn含量的增加降低，這歸因于交換電流密度(I0)和氫擴(kuò)散系數(shù)(D)的降低。

    Abstract:

    Effect of Mn substitution for Ni on phase constitution and electrochemical characteristics of La2Mg0.9Al0.1Ni7.5-xCo1.5Mnx (x=0, 0.3, 0.6, 0.9) hydrogen storage alloys was studied. It is found that Mn substitution will change phase composition and phase constitution of the alloys. LaNi3 phase disappears; the components of αLa2Ni7 first increases with Mn content from x=0 to x=0.3 and then decreases from x=0.6 to 0.9. Both component of LaMgNi4 phase and La5Ni19 phase increase as x increases in the alloys. Replacement of Ni by Mn will lower hydrogen storage capacity, maximum electrochemical discharge capacity and activation property of the alloy electrodes. La2Mg0.9Al0.1Ni7.2Co1.5Mn0.3 hydride electrode shows the best cycle stability. The high rate dischargeability of the alloys decreases with the increase of Mn content, which would be attributed to the decrease of exchange current density (I0) and diffusion coefficient of the hydrogen atom (D).

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王大輝,鐘燕萍,閆汝煦,羅永春,康 龍. La2Mg0.9Al0.1Ni7.5-xCo1.5Mnx貯氫合金的相結(jié)構(gòu)和電化學(xué)性能[J].稀有金屬材料與工程,2010,39(1):27~31.[Wang Dahui, Zhong Yanping, Yan Ruxu, Luo Yongchun, Kang Long. Phase Constitution and Electrochemical Characteristics of La2Mg0.9Al0.1Ni7.5-xCo1.5Mnx Hydrogen Storage Alloys[J]. Rare Metal Materials and Engineering,2010,39(1):27~31.]
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  • 收稿日期:2009-01-18
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