通过粉末烧结制备17Mg/12Al复合材料,然后再添加 Li,LiH 以及 LiAlH4混合球磨制备17Mg/12Al＋10M(M＝0,Li,LiH,LiAlH4)复合材料.经研究发现,烧结后的17Mg/12Al 复合储氢材料主要由 Mg17Al12和Mg2 Al3组成,经过20 h机械球磨后,Mg17 Al12和Mg2 Al3转变为具有FCC结构的Mg-Al固溶体.Li以及Li化合物的添加能提高Mg-A l固溶体的储氢容量和改善 Mg-A l 固溶体的热力学性能,如17 Mg/12Al 复合材料的储氢容量为1．73％(质量分数),添加 Li 以及 Li 化合物后,17Mg/12Al＋10M(M＝Li,LiH,LiAlH4)的吸氢量则分别上升到2．23％,2．36％和1．81％(质量分数),且脱氢活化能从194．5 kJ/mol分别降低到172．8,146．3和155．4 kJ/mol.
In this work,17Mg/12Al was synthesized by sintering and then milling with Li,LiH and LiAlH4 to prepared 17Mg/12Al+10M(M=0,Li,LiH,LiAlH4 )composites.The results show that the sintered 17Mg/12Al composite is mainly compose of Mg17 Al12 and Mg2 Al3 ,and the Mg17 Al12 and Mg2 Al3 phase transform into FCC structure Mg-Al solid solution after milled for 20 h.The hydrogen capacity and the thermodynamics prop-erty of 17Mg/12Al can be improved by Li or Li-based compound.Such as the hydrogen storage capacity and the activation energy of the 17Mg/12Al composite is 1.73wt% and 194.5 kJ/mol.While for the 17Mg/12Al+10M (M=Li,LiH,LiAlH4 )composites,the hydrogen storage capacity increases to 2.23wt%,2.36wt%,1.81wt%and the activation energy reduces to 172.8,146.3 and 155.4 kJ/mol,respectively.
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