Investigation to Hydrogen Storage Properties of LiAlH_4/LiNH_2 Composite

To further improve hydrogen storage properties of the metal complex hydrides and metal-N-H compounds,LiAlH4/LiNH2 composite is prepared by mechanical ball-milling,and their hydrogen storage properties are characterized with differential scanning calorimetry(DSC),and thermogravimetry(TG).The results show that more than 2.6% of hydrogen is released for the LiAlH4/LiNH2 composite during ball milling;the total hydrogen desorption capacity reaches 7% after heating to 400 ℃.In addition,the reaction mechanism of LiAlH4/LiNH2 composite and the catalytic effect of transition metal Ti on the hydrogen storage properties are investigated.It is found that the molar ratio of LiAlH4/LiNH2composite plays a significant role on the reaction mechanism and transition metal Ti exhibits a positive effect on the properties of the composite when the Ti content gets between 3% and 5%.