The solid-state electrolyte -PbSnF has been reported to have the highest fluorine-ion conductivity at room temperature among four different structures of the monoclinic (), orthorhombic (), cubic (), and tetragonal () at steady state. Therefore, finding an effective way to prepare -PbSnF or to transform -PbSnF from other phases is a research hotspot in FIBs. In particular, the transition mechanisms between -PbSnF and -PbSnF are still unclear in the reported literature because the influence of trace moisture is ignored in previous research, which always leads to controversial conclusions about the phase transition mechanism. Previous articles have reported that -PbSnF can only be transformed into -PbSnF by aging at a high temperature above 100 °C. However, this work shows that the transition from -PbSnF to -PbSnF can occur at room temperature. Moisture is the critical factor in inducing the phase transition from to -PbSnF. The resulting -PbSnF has a high fluoride-ion conductivity of 8.1 × 10 S cm, while the solid electrolyte for an all-solid-state FIB with BiF as the cathode and Sn as the anode has a maximum discharge capacity of 55.8 mAh g at 120 °C.

中文翻译：

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环境温度下水分对 β-PbSnF4 作为快速氟离子导体相变的影响

据报道，固态电解质-PbSnF在稳态下在单斜晶系、斜方晶系、立方晶系和四方晶系四种不同结构中具有最高的室温氟离子电导率。因此，寻找有效的方法制备-PbSnF或从其他相转化-PbSnF是FIBs的研究热点。特别是-PbSnF和-PbSnF之间的相变机制在报道的文献中仍然不清楚，因为先前的研究忽略了微量水分的影响，这总是导致关于相变机制的有争议的结论。之前的文章报道过-PbSnF只能通过100℃以上的高温老化才能转化为-PbSnF。然而，这项工作表明，从 -PbSnF 到 -PbSnF 的转变可以在室温下发生。水分是诱导从 -PbSnF 相变的关键因素。所得的-PbSnF具有8.1×10 S cm的高氟离子电导率，而以BiF为正极、Sn为负极的全固态FIB固体电解质在25℃时的最大放电容量为55.8 mAh g。 120℃。