High Reversible Hydrogen Capacity of LiNH2/Li3N Mixtures

Although Li3N can theoretically absorb as much as about 10 wt % hydrogen, its reversible hydrogen capacity is only about 5.5 wt % because only a fraction of the hydrogen absorbed can be desorbed at relatively low temperatures. In the present paper, it is shown that the addition of LiNH2 to Li3N constitutes an effective method to increase the reversible hydrogen capacity. It was found that the reversible hydrogen capacity of the LiNH2/Li3N mixture depends on its composition. A maximum reversible hydrogen capacity of 6.8 wt % could be achieved when the pre-added LiNH2 content in the LiNH2/Li3N mixture was between 28 and 50 mol %. Furthermore, the LiNH2/Li3N mixtures have fast hydrogenation kinetics and excellent cyclibility.