Nitrogen and fluorine co-doped titanium dioxide/carbon micro-sphere material, preparation method thereof and application of nitrogen and fluorine co-doped titanium dioxide/carbon micro-sphere material in sodium-ion battery
A titanium dioxide, co-doping technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of limited battery volume specific capacity, low tap density of tubular titanium dioxide, and difficulty in commercialization, etc., to achieve high volume ratio Capacity, increase sodium ion storage, and promote the effect of sodium ion diffusion
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Embodiment 1
[0057] The preparation method of nitrogen and fluorine co-doped titanium dioxide / carbon microsphere material, the steps are as follows:
[0058] (1) Disperse 1mL of tetrabutyl titanate in 30mL of glycerin solvent, and the concentration is 12g L -1 Cetyltrimethylammonium bromide solution (add 0.5ml tetramethylammonium hydroxide to adjust pH) 30mL, mix well;
[0059] (2) Transfer the above mixed solution to a hydrothermal reaction kettle, heat at 180°C for 12 hours; centrifuge the product, wash it with ethanol and water several times, and dry it in a vacuum oven at 60°C for 12 hours to obtain a titanium source precursor;
[0060] (4) Put the titanium source precursor and ammonium fluoride in a tube furnace, the mass ratio of the titanium source precursor and ammonium fluoride is 1:10, wherein the ammonium fluoride is located in the upstream direction of the gas flow, and is heated at 400 °C under the protection of argon. Heated at ℃ for 2 hours to obtain nitrogen and fluorine c...
experiment example 1
[0062] Morphology and composition test
[0063] The nitrogen, fluorine co-doped titanium dioxide / carbon microsphere material of embodiment 1 has been carried out morphology and composition test, as figure 1 shown. Depend on figure 1 a It can be seen that NF-TiO 2 / C is a porous microsphere with a diameter of 3-8 microns. Depend on figure 1 b high resolution electron microscope and figure 1 The XRD spectrum of c can confirm that the synthesized product is anatase phase titanium dioxide. Depend on figure 1 The X-ray photoelectron spectrum of d shows that the material contains N, F, and C elements. figure 2 is NF-TiO 2 The fine spectrum of / C. figure 2 a is the Ti 2p spectrum of titania, a small amount of Ti 3+ Indicating that there may be oxygen vacancies, figure 2 The C1s spectrum in b shows that N and F elements have been successfully doped into the carbon layer. figure 2 In c-d, it is further confirmed that N and F elements are doped into the titanium dioxide ...
Embodiment 2
[0082] The preparation method of nitrogen and fluorine co-doped titanium dioxide / carbon microsphere material, the steps are as follows:
[0083] (1) Disperse 3mL tetrabutyl titanate in 60mL glycerin solvent, and add the concentration of 12g L -1 Cetyltrimethylammonium bromide solution (add 0.5ml tetramethylammonium hydroxide to adjust pH) 30mL, mix well;
[0084] (2) Transfer the above mixed solution to a hydrothermal reaction kettle, heat at 180°C for 12 hours; centrifuge the product, wash it with ethanol and water several times, and dry it in a vacuum oven at 60°C for 12 hours to obtain a titanium source precursor;
[0085] (4) Put the titanium source precursor and ammonium fluoride in a tube furnace, the mass ratio of the titanium source precursor and ammonium fluoride is 1:10, wherein the ammonium fluoride is located in the upstream direction of the gas flow, and is heated at 400 °C under the protection of argon. Heated at ℃ for 2 hours to obtain nitrogen and fluorine co-...
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