Investigation on the properties of the mixture consisting of Mg(NH 2)2, LiH, and LiBH4 as hydrogen storage material

Abstract

A maximum hydrogen amount of 9.1 wt % was obtained at 300 °C from the 1Mg(NH2)2-2LiH-0.67LiBH4 system. Various analyses and thermodynamic calculations revealed that the MgH2 and LiNH2 can be readily converted to Mg(NH2)2 and LiH at 120 °C in the presence of LiBH4. A comparison between the sample 1Mg(NH2)2-2LiH-1LiBH4 and the ternary mixture 1MgH2-2LiNH2-1LiBH4 indicated that both samples behave very similarly in hydrogen desorption, thermal effects, and chemical changes during dehydrogenation. © 2008 American Chemical Society.