Effect of Lithium Ion Conduction on Hydrogen Desorption of LiNH<sub>2</sub>–LiH Solid Composite

This paper presents a relationship between ionic mobility and reaction kinetics for the Li–N–H system after doping LiTi<sub>2</sub>O<sub>4</sub>. The structural characteristic of this fast ionic conductor was introduced to the complex–hydride system. On one hand, the properties of the dehydrogenation process were improved significantly. On the other hand, the relationship between lithium ionic conductivity and the catalytic effect on the dehydrogenation was investigated according to the alternating current (AC) impedance results. The lithium ionic conductivity of samples with catalyst was higher than the samples without catalyst. Especially, the conductivity of LiNH<sub>2</sub> and LiH mixtures with LiTi<sub>2</sub>O<sub>4</sub> was almost 1.5 times higher than that of LiNH<sub>2</sub> and LiH. The mobility of the Li<sup>+</sup> ions between LiH and LiNH<sub>2</sub> solid phases was enhanced by adding LiTi<sub>2</sub>O<sub>4</sub>.