Li2NH‐LiBH4: a Complex Hydride with Near Ambient Hydrogen Adsorption and Fast Lithium Ion Conduction

Complex hydrides have played important roles in energy storage area. Here a complex hydride made of Li2NH and LiBH4 was synthesized, which has a structure tentatively indexed using an orthorhombic cell with a space group of Pna21 and lattice parameters of a = 10.121 A, b = 6.997 A, and c = 11.457 A. The Li2NH-LiBH4 sample (in a molar ratio of 1:1) shows excellent hydrogenation kinetics starting to absorb H2 at 310 K which is more than 100 K lower than that of pristine Li2NH. Furthermore, the Li+ ion conductivity of Li2NH-LiBH4 sample is ca. 1.0*10-5 S cm-1 at room temperature and is higher than that of either Li2NH or LiBH4 at 373 K. Those unique properties of the Li2NH-LiBH4 complex enable it a promising candidate for hydrogen storage and Li ion conductor.