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Preparation method of sulfur-doped titania nanofibers

A nanofiber and titanium dioxide technology, applied in the field of material chemistry, can solve the problems of low utilization rate of sulfur cathode active material and poor cycle performance, and achieve the effect of uniform particle size and high stability

Active Publication Date: 2020-02-28
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of low utilization rate of sulfur cathode active material and poor cycle performance, further improve the conductivity of sulfur and suppress the shuttle effect, and provides a preparation method of sulfur-doped titanium dioxide nanofibers

Method used

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  • Preparation method of sulfur-doped titania nanofibers
  • Preparation method of sulfur-doped titania nanofibers
  • Preparation method of sulfur-doped titania nanofibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 2.0g tetrabutyl titanate (C 16 h 36 o 4 Ti) was dissolved in a mixed solvent of 12mL of DMF, 12mL of ethanol and 6.0mL of acetic acid, added 2.0g of PVP, stirred for 3h to form solution A; 2.0g of PVP was dissolved in 12mL of DMF, 12mL of ethanol and 6.0mL of In the mixed solvent of acetic acid, stir for 3h to form solution B; put the two solutions A and B at a voltage of 17kV, a receiving distance of 15cm and 0.6mL h -1 Coaxial electrospinning was carried out at a flow rate of 100°C, solution B was the inner layer solution, and solution A was the outer layer solution; the obtained electrospun product was placed in an oven and dried at 100°C for 12 hours; the dried electrospun product was The product was transferred to a muffle furnace and sintered at 750°C for 5h to obtain TiO 2 nanotubes; 0.2 g of TiO 2 Mix the nanotubes with 0.3g of sublimed sulfur, put them into a closed container, and carry out melt sulfurization at 155°C; put 0.2g of TiO after sulfurization 2...

Embodiment 2

[0026] 2.0g tetrabutyl titanate (C 16 h 36 o 4 Ti) was dissolved in a mixed solvent of 12mL of DMF, 12mL of ethanol and 6.0mL of acetic acid, added 2.0g of PVP, stirred for 3h to form solution A; 2.0g of PVP was dissolved in 12mL of DMF, 12mL of ethanol and 6.0mL of In the mixed solvent of acetic acid, stirred for 3h to form solution B; the two solutions A and B were mixed at a voltage of 19kV, a receiving distance of 20cm and 0.6mL h -1 Coaxial electrospinning was carried out at a flow rate of 100°C, solution B was the inner layer solution, and solution A was the outer layer solution; the obtained electrospun product was placed in an oven and dried at 100°C for 12 hours; the dried electrospun product was The product was transferred to a muffle furnace and sintered at 900°C for 5h to obtain TiO 2 nanotubes; 0.2 g of TiO 2 Mix the nanotubes with 0.3g of sublimed sulfur, put them into a closed container, and carry out melt sulfurization at 155°C; put 0.2g of TiO after sulfur...

Embodiment 3

[0028] 2.0g tetrabutyl titanate (C 16 h 36 o 4 Ti) was dissolved in a mixed solvent of 12mL of DMF, 12mL of ethanol and 6.0mL of acetic acid, added 2.0g of PVP, stirred for 3h to form solution A; 2.0g of PVP was dissolved in 12mL of DMF, 12mL of ethanol and 6.0mL of In the mixed solvent of acetic acid, stir for 3h to form solution B; put the two solutions A and B at a voltage of 18kV, a receiving distance of 19cm and 0.6mL h -1 Coaxial electrospinning was carried out at a flow rate of 100°C, solution B was the inner layer solution, and solution A was the outer layer solution; the obtained electrospun product was placed in an oven and dried at 100°C for 12 hours; the dried electrospun product was The product was transferred to a muffle furnace and sintered at 850°C for 5h to obtain TiO 2 nanotubes; 0.2 g of TiO 2 Mix the nanotubes with 0.3g of sublimed sulfur, put them into a closed container, and carry out melt sulfurization at 155°C; put 0.2g of TiO after sulfurization 2...

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Abstract

The invention discloses a preparation method of sulfur-doped titania nanofibers. The preparation method includes the steps: dissolving tetrabutyl titanate serving as a main raw material in mixed solvents of N, N-dimethyl formamide, ethanol and acetic acid, and adding polyvinylpyrrolidone to obtain precursor mixture solution; performing electrostatic spinning by the aid of a coaxial technology under a certain voltage and flow rate; sintering electrostatic spinning products to obtain TiO2 nanotubes, mixing, melting and sulfurizing the TiO2 nanotubes and sublimed sulfur, adding the sulfurized TiO2 nanotubes into ethanol solution of the tetrabutyl titanate, adding ammonia water and hydrolyzing the tetrabutyl titanate to generate TiO2 externally coating sulfur and the TiO2 nanotubes to form thesulfur-doped titania nanofibers. The prepared sulfur-doped titania nanofibers have good electrochemical performance and are simple to operate, low in raw material cost, less in equipment investment and suitable for batch production in the whole preparation process.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a preparation method of sulfur-doped titanium dioxide nanofibers. Background technique [0002] Lithium-sulfur batteries are considered to be one of the most potential new high-performance battery systems due to their high theoretical energy density, cheap raw materials, and environmental friendliness. Although the research on lithium-sulfur batteries has a history of several decades, and significant research progress has been made in recent years, due to some special reaction properties of the electrochemical system composed of elemental sulfur and metal lithium, as well as polysulfides and The matching problem of the electrolyte has caused lithium-sulfur batteries to be far from being practical. At present, the development and application of lithium-sulfur batteries still face many technical problems (N.Jayaprakash et al., Angew Chem IntEdit, 50(2011) 5904-5908; K...

Claims

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Application Information

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IPC IPC(8): D06M11/46D01F9/10D01F1/08D01D5/00H01M4/48H01M10/052
CPCD06M11/46D01F9/10D01F1/08D01D5/0015H01M4/48H01M10/052Y02E60/10
Inventor 李星高楠
Owner NINGBO UNIV
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