Abstract
To improve the dehydrogenation properties of LiBH4, a novel hydrogen storage system, LiBH4–Li3AlH6, was synthesized by mechanical ball milling. The dehydrogenation/rehydrogenation properties of LiBH4–Li3AlH6 (molar rato: 1:1) composites were studied via thermogravimetry (TG), differential scanning calorimetry (DSC), mass spectral analysis (MS), powder X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The experimental results show that the hydrogen desorption capacity reaches 8.5wt% and that the whole dehydrogenation is a three-step process: (1) a decomposition reaction Li3AlH6→3LiH+Al+3/2H2, occurring at 160°C; (2) formation of an intermediate product from 300°C to 350°C, and then subsequent transformation into Al, AlB2, and H2. (2LiBH4+Al→[Li2B2AlH4]→x(AlB2+2LiH+3H2)+(1−x) [Li2B2AlH4], (0<x<1)); and (3) final dehydrogenation of LiH+Al→LiAl+1/2H2, occurring at 415°C, with sequential decomposition of the remaining intermediate ((1−x)[Li2B2AlH4]→(1−x)(AlB2+2LiH+3H2), (0<x<1)). Furthermore, the dehydrogenated products can be rehydrogenated to LiBH4 at 8MPa H2 and 400°C.
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