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Preparation method of sodium titanate nanofiber material and sodium ion hybrid capacitor using material as negative electrode

A nanofiber and sodium titanate technology, applied in the fields of nanomaterials and energy, can solve the problems of complex preparation process, unfavorable large-scale production, and high cost, and achieve the effects of simple production process, easy expansion of large-scale production, and high working voltage.

Inactive Publication Date: 2018-11-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrothermal method, solvothermal method, etc. are the most commonly used methods for preparing sodium titanate nanocomposites, but the preparation process of the above methods is complicated, high in cost, and unfavorable for large-scale production.

Method used

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  • Preparation method of sodium titanate nanofiber material and sodium ion hybrid capacitor using material as negative electrode
  • Preparation method of sodium titanate nanofiber material and sodium ion hybrid capacitor using material as negative electrode
  • Preparation method of sodium titanate nanofiber material and sodium ion hybrid capacitor using material as negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0033] At room temperature, add 3 mmol of isopropyl titanate to a mixed solvent containing 5 mL of N,N-dimethylformamide, 5 mL of absolute ethanol and 2 mL of acetic acid, stir for 10 min, add 2 mmol of sodium acetate, and continue stirring for 10 min to obtain Light yellow transparent liquid; then add 1.1 g of polyvinylpyrrolidone to the above solution, and continue stirring for 10 h; transfer the obtained light yellow transparent solution into a medical syringe, and start spinning on an electrospinning apparatus. The parameters of electrospinning were: the distance between the needle and the aluminum collecting plate was 15 cm, the spinning voltage was 13 kV, and the feeding rate was 0.6 mL h -1 . After spinning, the collecting plate loaded with nanofibers was placed at 60° C. for 10 h in vacuum. After collecting the nanofibers on the collecting plate, put them into a corundum porcelain boat and put them into a tube furnace for calcination. The specific calcination process...

Embodiment 2

[0040] The difference from Example 1 is that the specific calcination process is raised from room temperature to 250°C, kept for 2 hours, then raised to 600°C for 5 hours, and the heating rate is 1°C min -1 , the calcination atmosphere is nitrogen, and the sodium titanate-carbon nanofiber composite material is obtained. Figure 9 SEM image of the sodium titanate-carbon nanofiber composite material obtained for this Example 2. It is not difficult to see from the above figure that the sodium titanate-carbon nanofiber composite material obtained in this example has a uniform structure, the diameter of the nanofiber is 150-250 nm, and the sodium titanate particles with a particle size of 50-100 nm are evenly embedded in the carbon fiber. surface and interior.

Embodiment 3

[0042] At room temperature, add 3 mmol of n-butyl titanate to a mixed solvent containing 5 mL of N,N-dimethylformamide, 5 mL of absolute ethanol and 2 mL of acetic acid, stir for 10 min, add 2 mmol of sodium acetate, and continue stirring for 10 min to obtain Light yellow transparent liquid; then add 1.1 g of polyvinylpyrrolidone to the above solution, and continue stirring for 10 h; transfer the obtained light yellow transparent solution into a medical syringe, and start spinning on an electrospinning apparatus. The parameters of electrospinning were: the distance between the needle and the aluminum collecting plate was 15 cm, the spinning voltage was 13 kV, and the feeding rate was 0.6 mL h -1 . After spinning, the collecting plate loaded with nanofibers was placed at 60° C. for 10 h in vacuum. After collecting the nanofibers on the collecting plate, put them into a corundum porcelain boat and put them into a tube furnace for calcination. The specific calcination process i...

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Abstract

The invention provides a preparation method of a sodium titanate nanofiber material and a sodium ion capacitor using the material as a negative electrode. The composite material is obtained by the steps of performing mixing on a sodium source, a titanium source and an electrospinning solution, and carrying out electrostatic spinning treatment, drying treatment and two-step baking treatment. The production process is simple, and the scale production is easy to expand. The porous sodium titanate nanofibers and the sodium titanate-carbon nanofiber composite can be obtained by adjusting the calcining atmosphere. The obtained sodium titanate nanofiber material has the advantages that the specific surface area of the product is increased, and meanwhile, the ion / electron diffusion path of the material is shortened. The sodium ion hybrid capacitor prepared by taking the nanofiber material as the negative electrode is high in working voltage and long in cycle life; and the specific energy of the sodium ion hybrid capacitor is far higher that of the common electrochemical capacitor, which can reach 55Whkg-1, so that the composite material has very high practical value.

Description

technical field [0001] The invention relates to the fields of nanomaterials and energy, in particular to a sodium titanate nanofiber material, a preparation method thereof and a sodium ion hybrid capacitor using the material as a negative electrode. Background technique [0002] Among the existing energy storage technologies, lithium-ion batteries dominate the power supply of portable electronic products with many advantages such as high energy density, long cycle life, and high operating voltage. However, the scarcity and uneven global distribution of lithium resources will largely limit its application in large-scale energy storage. In contrast, sodium, which is in the same main group as lithium, is rich in resources, low in price, and has similar physical and chemical properties. Sodium ion energy storage is an energy storage system with great development potential, and has gradually become a research topic in the field of electrochemical energy storage. hotspot. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/04H01G11/30H01G11/86
CPCH01G11/04H01G11/30H01G11/86Y02E60/13
Inventor 张校刚董升阳吴朗源窦辉
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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