采用燃烧合成法合成了三元镁基储氢合金Mg2-xAlxNi(x=0.1~0.5),XRD衍射研究表明合成产物中出现了具有Ti2Ni型立方结构的新相,SEM结果显示合金表面存在大量缺陷.Al元素部分替代Mg对Mg2Ni电化学性能影响的研究表明:Mg2-xAlxNi合金的电化学容量和循环寿命明显优于无Al的Mg2Ni,这归因于新相Mg3AlNi2的结构特点及形成的Al2O3保护层.此外,对合成产物的进一步的机械研磨有助于改进合金的活化行为及电极容量,但无助于循环能力的提高.
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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