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Emily Milan of the Pasta Group et al have just published a paper on high-temperature Li3(OH)2BrPhase in Chemistry of Materials, where they used a wide range of experimental methods: pubs.acs.org/doi/10.1021/...

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Filling the Gaps in the LiBr-LiOH Phase Diagram: A Study on the High-Temperature Li3(OH)2Br Phase In this paper, we build on previous work to characterize a phase with stoichiometry Li3(OH)2Br existing between ∼225 and ∼275 °C in the LiBr-LiOH phase diagram. Diffraction studies indicate that the phase takes a hexagonal unit cell, and theoretical modeling is used to suggest a possible crystal structure. Nuclear magnetic resonance spectroscopy and electrochemical impedance spectroscopy measurements demonstrate excellent lithium-ion dynamics in this phase, with an ionic conductivity of 0.12 S cm–1 at 250 °C. Initial attempts to stabilize this phase at room temperature through quenching were not successful. Instead, a metastable state demonstrating poor ionic conductivity is found to form. This is an important consideration for the synthesis of Li2OHBr solid-state electrolytes (also found in the LiBr-LiOH phase diagram) which are synthesized by cooling through phase fields containing Li3(OH)2Br, and are hence susceptible to these impurities. https://pubs.acs.org/doi/10.1021/acs.chemmater.5c00206