Research on preparation and sodium storage properties of ultrafine nano-sodium ferric vanadium phosphate
Due to the high price,large particle size and poor conductivity of vanadium based polyanion compounds,a new type of sodium ferric vanadium phosphate material was prepared by doping iron ele-ment to partially replace vanadium element.The phase information and sodium storage properties of so-dium ferric vanadium phosphate were analyzed by XRD,SEM,UV-vis,laser particle size and BET.The research results show that the introduction of Fe element not only reduces the material cost,but also makes the prepared sodium ferric vanadium phosphate have the smaller particle size,larger specific sur-face area and better electrical conductivity compared with sodium vanadium phosphate.The specific surface area of sodium ferric vanadium phosphate is 46.5 m2/g,and the compaction density is 1.85 g/cm3,which is higher than that of the sodium vanadium phosphate,while 16.3 m2/g for the specific sur-face area and 1.79 g/cm3 for the compaction density of sodium vanadium phosphate.Meanwhile,the ob-tained sodium ferric vanadium phosphate shows higher energy storage performance.Under the condi-tion of current density at 1 mA/g,the discharge specific capacity of sodium ferric vanadium phosphate reaches 99.1 mAh/g,which is larger than that of sodium vanadium phosphate(91.9 mAh/g)at the same discharge current density.At the same time,after 10 charge and discharge cycles,the discharge capa-city of 85.3 mAh/g can be maintained(in the same condition,79.9 mAh/g of the discharge capacity can be maintained for the sodium vanadium phosphate),showing good cycle stability.
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