Add time:08/04/2019 Source:sciencedirect.com
SummaryLithium borohydride (cas 16949-15-8) ammoniates can be readily generated by LiBH4 absorbing ammonia at room temperature. Li(NH3)nBH4 (0 < n ≤ 2) performed high ionic conductivity near room temperature, e.g., 2.21 × 10−3 S cm−1 for mono-ammoniate at 40°C. A drastic increase in ionic conductivity occurs around 38°C due to the structural change resulting from ammonia desorption. Moreover, the jump of the ionic conductivity is reversible because ammonia absorption/desorption acts as a switch for the structural change. The experimental results show that the stable electrochemical window for the sample is ∼4 V. The crystal structure of Li(NH3)nBH4 (0 < n ≤ 1) can be easily changed while the equilibrium dynamically changes with temperature. First-principles calculation results also indicate that Li(NH3)BH4 exerts an expected compatibility in contact with lithium iron phosphate cathode material. Finally, by introducing a gas instead of substituting an element, a dynamic change of crystal structure is achieved, accompanied with the improvement of lithium ionic conductivity.
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