New molecular-salt-like hybrids contain ammonia borane (AB) in co-existence with lithium halides in single lattices. [LiI](NH3BH3) and [LiI](NH3BH3)2 are members of a generic [LiX]m(AB)n (X = I-, BH4-; m, n = integer) materials family which release hydrogen on decomposition and demonstrate Li+-ion conductivity more than two orders of magnitude higher than either LiBH4 or LiI.
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