Research on preparation of nano sodium vanadium phosphate and its sodium storage properties
Based on the severe preparation conditions,large particle size and poor conductivity,a new method to prepare sodium vanadium phosphate was proposed.By the formation of alkaline vanadium compounds,vanadium hydroxyloxide,and the in-situ anions exchange reactions between PO43-,F and OH-,nano vanadium sodium phosphate was consequently obtained.With the help of XRD,SEM,FTIR,the formation mechanism of nano vanadium sodium phosphate was analyzed,and the synthesis condi-tions were optimized.The electrochemical test results show that the sodium vanadium phosphate in nanoscale improves the electron/ion transport capacity,and makes the prepared sodium vanadium phos-phate show excellent sodium storage performances.When the current density is 10 mA/g,the specific discharge capacity is 106.68 mAh/g.At the same time,the specific discharge capacity of 80.85 mAh/g can be maintained after 20 charge and discharge cycles.
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