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

采用机械铣削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，并用PFG-NMR研究了氟离子扩散系数。PFG-NMR测得PbSnF4在300℃时的19F扩散系数为1 × 10-12 m2/s。PbSnF4在高温下结构由β相转变为γ相，PFG-NMR测量的扩散系数归因于PbSnF4的γ相。通过改变Pb1-xSnxF4中的Pb/Sn比值（x=0.4 ~ 0.6），在室温下制备了高温γ相，当x= 0.45时，离子电导率提高了9.4 × 10-4 cm-1，经交流阻抗分析证实。由于T2弛豫时间很短，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.