This thesis presents the influencd of diffrent input compounds masses on the final composition ratio of the materials Na$_3$V$_2$(PO$_4$)$_2$F$_3$ and Na$_3$V$_2$(PO$_4$)$_3$, their purity, and the prevention of unwanted umpurities. For the synthesis of Na$_3$V$_2$(PO$_4$)$_2$F$_3$, we used NH$_4$F, C$_6$H$_8$O$_7$, V$_2$O$_5$, 28% ammonia solution, NaF, S1-H$_3$PO$_4$ and NH$_4$F, while the NH$_4$F was not used in the synthesis of Na$_3$V$_2$(PO$_4$)$_3$.
After calcination, the samples were analyzed using a scanning electron microscope and x-ray powder diffraction to examine the composition and homogeneity of the material. The results showed that by adjusting the synthesis patameters and calcination method, it is possible to synthesize a sutible material for further testing, with high purity and good crystallinity, as a potential material for sodium-ion batteries.
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