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Mg(2-x)AlxNi的燃燒合成及其電極性能
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Synthesis and Electrode Characteristics of Mg(2-x)AlxNi Alloys by Combustion Synthesis
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Supported by the Natural Science Foundation of Gansu Province (3ZS042-B25-004)

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    摘要:

    采用燃燒合成法合成了三元鎂基儲(chǔ)氫合金Mg2-xAlxNi(x=0.1~0.5)，XRD衍射研究表明合成產(chǎn)物中出現(xiàn)了具有Ti2Ni型立方結(jié)構(gòu)的新相，SEM結(jié)果顯示合金表面存在大量缺陷。Al元素部分替代Mg對(duì)Mg2Ni電化學(xué)性能影響的研究表明：Mg2-xAlxNi合金的電化學(xué)容量和循環(huán)壽命明顯優(yōu)于無Al的Mg2Ni，這歸因于新相Mg3AlNi2的結(jié)構(gòu)特點(diǎn)及形成的Al2O3保護(hù)層。此外，對(duì)合成產(chǎn)物的進(jìn)一步的機(jī)械研磨有助于改進(jìn)合金的活化行為及電極容量，但無助于循環(huán)能力的提高

    Abstract:

    The Mg-based hydrogen storage alloy Mg2-xAlxNi(x=0.1-0.5) was synthesized by combustion synthesis. XRD indicates that a new phase with the cubic Ti2Ni structure appears in the product, and SEM shows that there are a large number of defects on the alloy surface. The effect of partial substitution of Al for Mg on the electrochemical performances of Mg2Ni was investigated. The results show that Al addition affects its electrode characteristics strongly. The electrochemical capacity and cycle lives of Al-containing alloys increase strongly compared to the Al-free alloy. This is attributed to the structure of a new phase (Mg3AlNi2), and the formation of the protect layer of Al2O3. In addition, the results reveal that mechanical grinding is beneficial to improve activation behavior and the maximum electrode capacity, but can not improve the cyclic stability due to breaking of Al2O3 protect layer.

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陳秀娟,候運(yùn)豐,夏天東,劉學(xué)龍,趙文軍. Mg(2-x)AlxNi的燃燒合成及其電極性能[J].稀有金屬材料與工程,2009,38(5):757~760.[Chen Xiujuan, Hou Yunfeng, Xia Tiandong, Liu Xuelong, Zhao Wenjun. Synthesis and Electrode Characteristics of Mg(2-x)AlxNi Alloys by Combustion Synthesis[J]. Rare Metal Materials and Engineering,2009,38(5):757~760.]
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  • 收稿日期:2008-05-18
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