“…This improvement is coming from the fact that the composite takes different reaction pathways from each constituent on heating. In fact, Chen et al reported that the composite of LiH and LiNH 2 reversibly released 6.3 mass% H 2 at around 200 • C [2], although LiH and LiNH 2 themselves decomposed into Li and H 2 above 650 • C, and into Li 2 NH and NH 3 at 300 • C, respectively [3,4]. These facts indicate that making a composite could improve the thermodynamics in the LiH-LiNH 2 system, which can be understood by the NH 3 -mediated reaction mechanism [4].…”