The evolution of diborane accompanying H-2 release during the decomposition of transition metal borohydrides reduces the purity of evolved hydrogen and results in capacity loss during cycling. To solve the problem, a small amount of LiNH2 is doped into a 3LiBH(4)/MnF2 composite and the decomposition properties are investigated. The results show that after doping LiNH2, the formation of diborane during decomposition is effectively suppressed meanwhile the decomposition temperature is significantly reduced. Around 5 wt.% pure hydrogen can be released at 95-140 degrees C from 5 wt.% LiNH2-doped 3LiBH(4)/MnF2 composite. These improvements in the decomposition performance are mainly attributed to the prevention of the formation of B-H-B bonds for B2H6 and the destabilization of B-H bonds in borohydrides by the interaction of BH4- and NH2- Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.