State of Art Electrolyte materials for Novel Room Temperature All Solid State Fluoride ion Batteries

采用机械球磨法合成了适合全固态氟离子电池发展的氟离子导电固体电解质，并利用PFG-NMR研究了氟离子在固体电解质中的扩散系数。通过PFG-NMR测量的PbSnF 4的19 F扩散系数在300摄氏度下为1 × 10-12 m2/s。PbSnF 4在高温下从β相转变为γ相，PFG-NMR测得的扩散系数归因于PbSnF 4的γ相。通过改变Pb 1-xSnxF 4（x=0.4-0.6）中的Pb/Sn比率，在室温下制备高温γ相，其中通过交流阻抗分析证实，对于x = 0.45，离子电导率增加9.4 x 10-4 Scm-l。由于T2弛豫时间非常短，我们在室温下使用PFG-NMR测量扩散系数的努力没有成功。

Fluoride ion conducting solid electrolytes were suitable for the development of all solid state fluoride ion battery were synthesized using mechanical milling process and the fluoride ion diffusion coefficient is studied using PFG-NMR. The 19F diffusion coefficient for PbSnF4 measured by PFG-NMR was 1 x 10-12 m2/s at 300 degree celcius. PbSnF4 changes structure from beta to gamma phase at high temperatures, the diffusion coefficient measured by PFG-NMR is attributed to the gamma phase of PbSnF4. By varying the Pb/Sn ratio in Pb1-xSnxF4 (x=0.4-0.6), the high temperature gamma phase was prepared at room temperature with an increase in ionic conductivity of 9.4 x 10-4 Scm-1 for x = 0.45 confirmed by ac impedance analysis. Our efforts to measure the diffusion coefficient using PFG-NMR at room temperature was not successful due to the very short T2 relaxation time.