Room temperature synthesis of anti-perovskite structured Li₂OHBr

Lithium-rich anti-perovskite (LiRAP) structured Li⁺ conductors are soft and have been reported to be potentially high Li⁺ conductive material. This article reports a novel synthesis method to fabricate Li₂OHBr, a partially hydrated LiRAP, at room temperature just by ball milling of LiOH and LiBr powders. The resultant Li₂OHBr was formed as cubic-phase (a = 4.046 Å) with melting point at 254 °C. Lithium-ion conductivity of the Li₂OHBr was 1.1 × 10⁻⁶ S cm⁻¹ at 25 °C with the activation energy of 0.54 eV. The resultant Li₂OHBr repeated stable lithium plating/stripping reactions for 100 cycles at 60 °C with 50 μA cm⁻².