Remarkable improvement of hydrogen sorption properties of Li-N-H system has been obtained by doping with a small amount of LiBH4. The starting and ending temperatures of hydrogen desorption shift to lower temperatures and the release of NH3 is obviously restrained by 10 mol% LiBH4 doping. The kinetics of hydrogen desorption and absorption of Li-N-H system became faster by the addition of LiBH4. About 4 wt.% H-2 can be released within 30 min and similar to 4.8 wt.% H-2 can be reabsorbed within 2 mm by LiBH4 doped sample at 250 degrees C, while only 1.44 wt.% H-2 is released and 2.1 wt.% is reabsorbed for pure Li-N-H system. The quaternary hydride (LiNH2)(x)(LiBH4)((1-x)) formed by the reaction between LiBH4 and LiNH2 may contribute to the enhancement of the hydrogen sorption performances by yielding a ionic liquid phase and transferring LiNH2 from solid state to molten state with a weakened N-H bond. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.