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In this work, we report a new reversible hydrogen storage composite based on 6LiBH4+CaF2. It has a theoretical hydrogen capacity of 9.6 wt % (0.09 g·ml−1) and a slightly reduced thermodynamic stability compared with pure LiBH4. The dehydrogenation of 6LiBH4 + CaF2yielded CaB6and a solid solution of LiH and LiF that can be rehydrogenated to form LiBH4and CaF2. The composite revealed good reversibility of hydrogen storage regardless of the hydrogen back pressure applied during the dehydrogenation. Catalysts like TiF3, CeF3, and NbCl5were found to enhance its dehydriding kinetics. XRD and FT-IR analyses revealed that hydrogen uptake of the composite proceeded through a reaction path involving CaH2as the main intermediate.

Currently, there are many methods to improve the charging-discharging performances of hydriding alloys such as alloying, metal coating or plating. Mechanical grinding has been established as a method for preparing new alloy materials to modify the alloy for better electrochemical durability in this paper. X-ray diffraction results show partial disorder of the ground alloy. Mechanical grinding can improve the durability of MlNi4.7Al0.3electrode although there is a loss of discharge capacity and gaseous hydriding capacity. Higher durability and reasonable capacity of metal hydride electrode are expected through optimizing mechanical grinding time and grinding component.

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