LiBH4, is an ionic solid, consisting of Li+ and BH4- ions. It undergoes a structural phase transition at 383K. Within the HT phase, the BH4-units undergo rapid re-orientations, as studied previously by quasielastic neutron scattering (QENS) at IRIS. Triggered by the phase transition the ion conductivity drastically increases from 5x10-6 S/cm to 2x10-3 S/cm, making LiBH4 a superionic conductor at elevated temperatures. Stabilization of the HT phase of this compound by addition of lithium halides such ad LiCl, LiBr or LiI results in an enhanced conductivity also at room temperature. We propose to investigate the role of the halide ion on the phase transition and the rotational diffusion of the BH4 anions close to room temperature. The goal is to understand the stabilizing effect of the halide ion and effect of the BH4 rotation on the ion conductivity within the stabilized LiBH4.