Self-assembled NaV6O15 nano sheet microsphere as well as preparation method and application thereof
A nanosheet and self-assembly technology, applied in the field of nanomaterials and electrochemistry, to achieve the effect of reducing defects, excellent electrochemical storage performance, and smooth surface
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Embodiment 1
[0032] A self-assembled NaV 6 o 15 The preparation method of nano sheet microsphere, comprises the following steps:
[0033] 1. Convert 5.0×10 -4 molNH 4 VO 3 and 5.0×10 -4 mol Na 2 CO 3 Add to a beaker with 50mL of distilled water, stir at 80°C for 30min until the mixture dissolves;
[0034] 2. Add 0.1 g of cetyltrimethylammonium bromide to the solution obtained in step 1 and stir for 2 hours, then immerse the beaker in cold water to cool the solution to room temperature;
[0035]3. Add 1 mL of 3% H to the solution obtained in step 2 2 o 2 , stirred for 2 minutes, then added 2mol / L HCl to adjust the solution to pH = 2, and kept stirring for about 30 minutes, it is easy to react and crystallize nucleation under the acidic condition of pH = 2, and the added HCl will volatilize in the subsequent reaction, avoiding Impurities are formed during the subsequent synthesis of the product;
[0036] 4. The solution obtained in step 3 was subjected to hydrothermal reaction, th...
Embodiment 2
[0048] This embodiment is basically the same as the steps in embodiment 1, the difference is that in step 1, the added VO 2 NO 3 3.8×10 -4 mol, Na 2 CO 3 3.8×10 -4 mol, the stirring temperature is 100°C, and the stirring time is 25min; in step 2, the amount of cetyltrimethylammonium bromide added is 0.2g, and the solution is adjusted to a pH of 1; in step 4, hydrothermal The reaction temperature is 160° C., and the time is 30 hours; in step 5, the drying temperature is 100° C., the calcination temperature is 300° C., and the calcination time is 5 hours.
[0049] self-assembled NaV 6 o 15 Nanosheets and microspheres were tested by X-rays, scanning electron microscopes, transmission electron microscopes and button cells for electrochemical performance tests. X-ray tests showed that the prepared product was NaV 6 o 15 The diameter of the microspheres obtained by the electron microscope test is close to 1 μm, and its appearance and size are uniform; the test by the transmi...
Embodiment 3
[0051] The steps in this embodiment are basically the same as in Example 1, the difference is that in step 1, the added (NH 4 ) 3 VO 4 2.64×10 -3 mol, Na 2 CO 3 6.6×10 -4 mol, the stirring temperature is 60°C, and the stirring time is 35min; in step 2, the pH of the solution is adjusted to 3; in step 4, the temperature of the hydrothermal reaction is 200°C, and the time is 18h; in step 5, The drying temperature is 150°C, the calcination temperature is 350°C, and the calcination time is 5h.
[0052] self-assembled NaV 6 o 15 Nanosheets and microspheres were tested by X-rays, scanning electron microscopes, transmission electron microscopes and button cells for electrochemical performance tests. X-ray tests showed that the prepared product was NaV 6 o 15 , the diameter of the obtained product microspheres tested by electron microscopy is close to 3 μm, and its appearance and size are uniform; the microspheres obtained by transmission electron microscopy (TEM) tests are c...
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