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A detailed analysis of the dehydrogenation mechanism of LiBH 4 / x LiAlH 4 ( x = 0.5, 1, 2) composites was performed by thermogravimetry (TG), differential scanning calorimetry (DSC), mass spectral analysis (MS), powder X-ray diffraction (XRD) and scanning electronic microscopy (SEM), along with kinetic investigations using a Sievert-type apparatus. The results show that the dehydrogenation pathway of LiBH 4 / x LiAlH 4 had a four-step character. The experimental dehydrogenation amount did not reach the theoretical expectations, because the products such as AlB 2 and LiAl formed a passivation layer on the surface of Al and the dehydrogenation reactions associated with Al could not be sufficiently carried out. Kinetic investigations discovered a nonlinear relationship between the activation energy (E a ) of dehydrogenation reactions associated with Al and the ratio x , indicating that the E a was determined both by the concentration of Al produced by the decomposition of LiAlH 4 and the amount of free surface of it. Therefore, the amount of effective contact surface of Al is the rate-determining factor for the overall dehydrogenation of the LiBH 4 / x LiAlH 4 composites.

Hydrogen Desorption Properties of LiBH4/xLiAlH4 (x = 0.5, 1, 2) Composites