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La0.8-xCexMg0.2Ni3.5(x=0~0.20)貯氫合金電極的低溫放電性能
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Electrochemical Properties of La0.8-xCexMg0.2Ni3.5 (x=0~0.20) Hydrogen Storage Alloy Electrode at 233 K
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    摘要:

    用冷坩堝磁懸浮熔煉爐制備La0.8-xCexMg0.2Ni3.5 (x=0, 0.05, 0.10, 0.15, 0.20)貯氫電極合金，采用X射線衍射、三電極體系系統(tǒng)研究合金的微觀結(jié)構(gòu)和電化學性能。研究表明：合金為多相結(jié)構(gòu)，主相均為Ce2Ni7型六方相，還包括CaCu5型六方相、PuNi3型菱方相；P-C-T 曲線顯示，隨著Ce含量的增加，合金放氫平臺區(qū)域變窄，平臺壓力升高。合金中各組成相單胞體積的減小是其主要原因。隨著Ce含量的增加，合金常溫最大放電容量逐漸減小并且循環(huán)穩(wěn)定性有一定改善；低溫最大放電容量則先增大后減小，合金的低溫高倍率放電性能以及交換電流密度均隨Ce含量的增加而增加，但氫擴散系數(shù)隨著Ce含量的增加而減小

    Abstract:

    In this paper, the effects of cerium content on the structural and electrochemical properties of the La0.8-xCexMg0.2Ni3.5 (x=0, 0.05, 0.10, 0.15, 0.20) hydrogen storage alloys have been studied systematically. XRD analyses show that all these alloys consist of hexagonal Ce2Ni7-type main-phase, hexagonal CaCu5-type phase, and rhombohedral PuNi3-type phase. The P-C isotherms curves show that the plateau pressure of the hydrogen desorption increases gradually and the plateau region becomes narrower with increasing the Ce content in the alloys. It is also found that with increasing the Ce content, the discharge capacity at 303 K decreases and the cycling life can be gradually improved, but the discharge capacity at 233 K increases firstly and then decreases. The high rate dischargeability (HRD) and the exchange current density I0 increase but the hydrogen diffusion coefficient D of the alloy electrodes decreases with the increase of Ce content at 233 K. These imply that the charge-transfer reaction on the surface of alloy electrodes is the rate-determining step at 233 K

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沈向前,陳云貴,陶明大,吳超玲,王 偉,鄧 剛. La0.8-xCexMg0.2Ni3.5(x=0~0.20)貯氫合金電極的低溫放電性能[J].稀有金屬材料與工程,2009,38(2):237~241.[Shen Xiangqian, Chen Yungui, Tao Mingda, Wu Chaoling, Wang Wei, Deng Gang. Electrochemical Properties of La0.8-xCexMg0.2Ni3.5 (x=0~0.20) Hydrogen Storage Alloy Electrode at 233 K[J]. Rare Metal Materials and Engineering,2009,38(2):237~241.]
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  • 收稿日期:2008-06-30
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