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

Abstract Complex hydrides have played important roles in energy storage area. Here a complex hydride made of Li 2 NH and LiBH 4 was synthesized, which has a structure tentatively indexed using an orthorhombic cell with a space group of Pna 2 1 and lattice parameters of a= 10.121, b= 6.997, and c= 11.457 Å. The Li 2 NH‐LiBH 4 sample (in a molar ratio of 1:1) shows excellent hydrogenation kinetics, starting to absorb H 2 at 310 K, which is more than 100 K lower than that of pristine Li 2 NH. Furthermore, the Li + ion conductivity of the Li 2 NH‐LiBH 4 sample is about 1.0×10 −5 S cm −1 at room temperature, and is higher than that of either Li 2 NH or LiBH 4 at 373 K. Those unique properties of the Li 2 NH‐LiBH 4 complex render it a promising candidate for hydrogen storage and Li ion conduction.