Abstract
Metal borohydrides (M(BH4)n, where n is the valence of metal M) have received considerable attention as promising hydrogen storage materials owing to their high hydrogen densities. In particular, the successful synthesis of rare-earth (RE) borohydrides free of solvates using mechanochemical milling and/or wet chemistry has promoted the study of these compounds as hydrogen storage materials and solid-state Li-ion conductors. Therefore, several RE borohydrides were discovered and characterized, and showed a rich chemistry with common structural characteristics and physical properties. RE borohydrides possess adequate stability with respect to their decomposition temperature and good hydrogen sorption kinetics. This chapter summarizes new synthetic approaches to RE borohydrides and their structural, physical, and chemical properties. An analysis is presented of the dehydrogenation pathways and hydrogen storage properties of the main RE borohydrides. Finally, the combination of LiBH4 with RE hydrides or RE borohydrides forming destabilized composites is evaluated as new hydrogen storage systems.
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