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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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稀土镁基贮氢电极合金的结构与电化学性能研究
, PP. 666-672
Keywords: 镁基贮氢合金,结构特性,P-C-T曲线
Abstract:
Rietveld全谱拟合表明,La0.7Mg0.3(Ni0.85Co0.15)x(x=2.5,3.0,3.5,4.0,4.5,5.0)型合金主相由(La,Mg)Ni3和LaNi5组成.随x的增加,(La,Mg)Ni3相的丰度从48.4%(x=2.5)增加到78.2%(x=3.5)然后减小到12.2%(x=5.0);LaNi5相的丰度当x=2.5—3.5时,保持基本不变(约20%),当x值增加到4.0时突然增加到71.9%.随着x增加,合金的吸氢量首先增加然后减小,合金放氢平台压力首先保持基本不变然后增加;合金电极的最大放电容量从228.3mA？h/g(x=2.5)增加到395.6mA？h/g(x=3.5),然后又减小到226.8mA？h/g(x=5.0).当放电电流密度Id=1000mA？h/g时,合金电极的高倍率性能从x=2.5时的53.5%提高到x=3.5时的85.8%,然后又减小到x=4.5时的73.9%.随着x值的增加,合金电极的电化学反应动力学性能首先增加,达到一个最大值后,其动力学性能又有所下降.
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