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Al替代Ni對A2B7型貯氫電極合金性能的影響
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TG146.4

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北京科技大學(xué)北京市先進(jìn)粉末冶金材料與技術(shù)重點實驗室資助（20050408190）


Effects of Substitution of A! for Ni on Properties of A2B7-Type Hydrogen Storage Electrode Alloys
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    摘要:

    用冷坩堝磁懸浮熔煉方法制備La0.7Mg0.3（Ni0.85-xCo0.15Alx）3.4貯氫電極合金，采用XRD、三電極體系及SEM研究相結(jié)構(gòu)、電化學(xué)性能及電極的表面狀態(tài)。Rietveld法全譜擬合分析表明，該體系合金為多相結(jié)構(gòu)，主相為ce2Ni7型六方相，還包括CaCu5型六方相、PuNi3型菱方相、MgCu2型立方相及BCr型正交相。Al元素為ce2Ni7型主相的有利形成元素，且Al替代Ni后，各組成相的晶胞體積均增加。P-C-T曲線顯示隨著Al替代量X的增加，合金放氫平臺的平臺區(qū)域變窄，平臺壓力降低，平臺特性變差。電化學(xué)性能測試表明，隨著X增加合金電極的最大放電容量降低，高倍率放電性能降低，循環(huán)穩(wěn)定性明顯提高。

    Abstract:

    The La0.7Mg0.3(Ni0.85-xCo0.15Alx)3.4 hydrogen storage electrode alloys were prepared by cold crucible melting under argon gas atmosphere. The phase structure of these alloys and the electrochemical properties and surface of corresponding electrodes were investigated by means of XRD and tri-electrode test system and SEM. Rietveld analyses show that all these alloys consist of hexagonal Ce2Ni7-type main-phase,hexagonal CaCu5-type phase,rhombohedral PuNi3-type phase,cubic MgCu2-type Laves-phase and orthorhombic BCr-type phase. The Ce2Ni7-type main-phase content and the cell volume of all these phases increase with increasing of x. P-C isotherms show that hydrogen-desorption plateau region narrows,and the plateau pressure decreases and the plateau becomes steeper with increasing of x. The electrochemical results show that maximum discharge capacity and high-rate dischargeability decrease,cyclic stability is improved markedly with increasing of x.

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周增林 宋月清 崔舜 黃倬 郭志猛 曲選輝. Al替代Ni對A2B7型貯氫電極合金性能的影響[J].稀有金屬材料與工程,2007,36(6):1058~1062.[Zhou Zenglin, Song Yueqing, Cui Shun, Huang Zhuo, Guo Zhimeng, Qu Xuanhui. Effects of Substitution of A! for Ni on Properties of A2B7-Type Hydrogen Storage Electrode Alloys[J]. Rare Metal Materials and Engineering,2007,36(6):1058~1062.]
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  • 最后修改日期:2007-01-10
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