Preparation method of sodium vanadium phosphate material
A technology of sodium vanadium phosphate and phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of particle size uniformity and particle size of difficult particles, achieve rapid nucleation and reduce crystal nuclei The effect of growing up and increasing the electronic conductivity
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[0034] The embodiment of the present invention provides a preparation method of a sodium vanadium phosphate material, and the method comprises the following steps:
[0035] 1) Dissolving the vanadium source in deionized water is denoted as solution A;
[0036] 2) Dissolve the alkaline substance in deionized water, denoted as solution B; then add solution B dropwise to solution A, stir to pH=4~8 of the mixed solution at room temperature, and obtain vanadium oxyhydroxide precursor after centrifugal filtration ;
[0037] 3) Dissolve phosphate, or phosphate and fluoride in deionized water, and denote it as solution C; then disperse the vanadium oxyhydroxide precursor obtained in step 2) in solution C, stir at room temperature for 0.5-24 h, filter, After drying, the sodium vanadium phosphate material is obtained.
[0038] In some embodiments, the molecular formula of the sodium vanadium phosphate material prepared by the method of the present invention is NaVOPO 4 , Na 3 (VOPO ...
Embodiment 1
[0052] A preparation method of sodium vanadium phosphate material, comprising the steps:
[0053] 1) Weigh 1.6 g of vanadyl sulfate, dissolve it in 50 mL of deionized water, and prepare solution A.
[0054] 2) Weigh 2.8 g of sodium hydroxide, dissolve it in 50 mL of deionized water, and configure it as solution B; then add solution B dropwise to solution A at a rate of one drop per second, stir continuously to pH=5 at room temperature, and centrifuge. Vanadium oxyhydroxide precursor is obtained after filtration, and its XRD pattern is as follows figure 1 The middle curve 1 is shown.
[0055] 3) Weigh 1.2 g of sodium fluoride and 9.0 g of sodium dihydrogen phosphate, dissolve in 50 ml of deionized water, and configure solution C. The vanadium oxyhydroxide precursor obtained in step 2) is dispersed in solution C, continuously stirred at room temperature for 24 h, filtered and dried to obtain the product.
[0056] XRD test is carried out to the product obtained in the present ...
Embodiment 2
[0060] A preparation method of sodium vanadium phosphate material, comprising the steps:
[0061] 1) Weigh 2.6 g of vanadium chloride, dissolve it in 50 mL of deionized water, and prepare solution A.
[0062] 2) Weigh 2.4 g of sodium hydroxide, dissolve it in 50 mL of deionized water, and configure it as solution B; then add solution B dropwise to solution A at a rate of one drop per second, stir continuously to pH=7 at room temperature, and centrifuge. The vanadium oxyhydroxide precursor is obtained after filtration.
[0063] 3) Weigh 1.2 g of sodium fluoride and 10.6 g of disodium hydrogen phosphate, dissolve them in 50 ml of deionized water, and configure solution C. The vanadium oxyhydroxide precursor obtained in step 2) is dispersed in solution C, continuously stirred at room temperature for 12 h, filtered and dried to obtain the product.
[0064] XRD and SEM tests were carried out on the obtained products, and the test results were as follows Image 6 and Figure 7 s...
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