Reaction Pathways Determined by Mechanical Milling Process for Dehydrogenation/Hydrogenation of the LiNH2/MgH2 System

The dehydrogenation/hydrogenation processes of the LiNH2/MgH2 (1:1) system were systematically investigated with respect to balller milling and the subsequent heating process. The reaction pathways for hydrogen desorption/absorption of the LiNH2/MgH2 (1:1) system were found to depend strongly on the milling duration due to the presence of two competing reactions in different stages (i.e., the reaction between Mg(NH2)(2) and MgH2 and that between Mg(NH2)(2) and LiH), caused by it metathesis reaction between LiNH2 and MgH2, which exhibits more the nature of solid-solid reactions. The study provides LIS with a new approach for the design of novel hydrogen storage systems and the improvement of hydrogen-storage performance of the amide/hydride systems.