First-principles determination of the ground-state structure of LiBH4

The potential energy surface of LiBH4 is investigated by a ground-state search method based on simulated annealing and first-principles density functional theory calculations. A new stable orthogonal structure with Pnma symmetry is found, which is 9.66kJ/mol lower in energy than the proposed Pnma structure by Soulié et al.. For the high-temperature structure, we suggest a new monoclinic P2/c structure, which is 21.26kJ/mol over the ground-state energy and shows no lattice instability.