(368c) Hydrogen Storage System Using LiBH4

LiBH₄ is a promising candidate for hydrogen storage due to its high gravimetric hydrogen capacity, but improvement must be achieved for thermodynamic stability, slow reaction kinetics and reactivity against impurity gas species. We propose that thermodynamic and kinetic problems can be improved by using the mixture composed of LiBH₄, MgH₂ and Al and that reactivity against impurity gas can be improved by utilization of excess LiBH₄ which reacts with impurity gas species such as water vapor and works as hydrogen source as a result. In this paper, firstly the mixture of 4LiBH₄-MgH₂-xAl (x=1 or less) is reported on its constituent phases, kinetic hydrogen desorption properties and cyclic de-/re-hydrogenation properties, and then LiBH₄ is reported on its reaction against impurity gas species, for example H₂O and O₂, and its hydrogen emission in heating after poisoning.