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Preparation method of nano sulfur/nitrogen-doped titanium dioxide composite cathode material

A composite cathode material, titanium dioxide technology, applied in the direction of battery electrodes, electrical components, circuits, etc., to solve the volume expansion, improve cycle performance, enhance the effect of electrochemical performance

Inactive Publication Date: 2018-03-02
SYNERGY INNOVATION INST OF GDUT HEYUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These special shapes (a large number of pores) can adsorb more sulfur and polysulfides, and make the distribution of sulfur more uniform, effectively inhibit the dissolution and shuttle effect of polysulfides, reduce the loss of active materials, and solve the problem of electrode materials. The volume expansion problem, thereby improving the cycle performance, increasing the discharge specific capacity and enhancing the electrochemical performance of lithium-sulfur batteries

Method used

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  • Preparation method of nano sulfur/nitrogen-doped titanium dioxide composite cathode material
  • Preparation method of nano sulfur/nitrogen-doped titanium dioxide composite cathode material
  • Preparation method of nano sulfur/nitrogen-doped titanium dioxide composite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Stir and mix 10 mL of tetrabutyl titanate and 10 mL of isopropanol evenly.

[0028] (2) 60mL (0.2M) of HNO 3 Mix well with 2mL of acetylacetone.

[0029] (3) Add the solution in (1) to (2) at a constant speed for 2 minutes, and stir for 10 hours in a water bath at 50° C. to obtain a nano-sol.

[0030] (4) Add 10mL of triethylamine and stir for 10h at room temperature, add 0.2M HNO 3 The pH value of the solution was adjusted to 7.

[0031] (5) The above solution was transferred into a high-pressure hydrothermal reaction kettle, kept at 120° C. for 12 hours, and then cooled to room temperature to obtain a nitrogen-doped titanium dioxide precipitate.

[0032] (6) Centrifuge the precipitate, wash it with absolute ethanol, and dry it in an oven at 90° C. to form a xerogel.

[0033] (7) Weigh the nano-sulfur powder and nitrogen-doped titanium dioxide in a mass ratio of 1:1, and add them to a steel ball mill tank for ball milling (mass ratio ball: material: ethanol = 4...

Embodiment 2

[0039] (1) Stir and mix 10 mL of tetrabutyl titanate and 10 mL of isopropanol evenly.

[0040] (2) 60mL (0.2M) of HNO 3 Mix well with 2mL of acetylacetone.

[0041] (3) Slowly add the solution in (1) to (2) (adding at a constant speed within 2 min), and stir for 10 h in a water bath at 50° C. to obtain a nano-sol.

[0042] (4) Add 10mL of triethylamine and stir for 10h at room temperature, add 0.2M HNO 3 The pH of the solution was adjusted to 10.

[0043] (5) The above solution was transferred into a high-pressure hydrothermal reaction kettle, kept at 120° C. for 12 hours, and then cooled to room temperature to obtain a nitrogen-doped titanium dioxide precipitate.

[0044] (6) Centrifuge the precipitate, wash it with absolute ethanol, and dry it in an oven at 90° C. to form a xerogel.

[0045] (7) Weigh the nano-sulfur powder and nitrogen-doped titanium dioxide in a mass ratio of 1:1, and add them to a steel ball mill tank for ball milling (mass ratio ball: material: ethan...

Embodiment 3

[0048] (1) Stir and mix 10 mL of tetrabutyl titanate and 10 mL of isopropanol evenly.

[0049] (2) 60mL (0.2M) of HNO 3 Mix well with 2mL of acetylacetone.

[0050] (3) Slowly add the solution in (1) to (2) (adding at a constant speed within 2 min), and stir for 10 h in a water bath at 50° C. to obtain a nano-sol.

[0051] (4) Add 10mL of triethylamine and stir for 10h at room temperature, add 0.2M HNO 3 Adjust the pH value of the solution to 3.

[0052] (5) The above solution was transferred into a high-pressure hydrothermal reaction kettle, kept at 120° C. for 12 hours, and then cooled to room temperature to obtain a nitrogen-doped titanium dioxide precipitate.

[0053] (6) Centrifuge the precipitate, wash it with absolute ethanol, and dry it in an oven at 90° C. to form a xerogel.

[0054] (7) Weigh the nano-sulfur powder and nitrogen-doped titanium dioxide in a mass ratio of 1:1, and add them to a steel ball mill tank for ball milling (mass ratio ball: material: ethano...

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Abstract

The invention relates to a preparation method of a nano sulfur / nitrogen-doped titanium dioxide composite cathode material. The method comprises the following steps: tetrabutyl titanate and isopropanolare stirred and mixed, HNO3 and acetylacetone are mixed, two mixed liquor are mixed, a sol is formed after stirring at a certain temperature, HNO3 is added for adjusting a pH value, the above solution is placed in a high-temperature hydrothermal reactor for a reaction, and washing and drying are carried out to obtain xerogel, the xerogel and sulfur powder are subjected to ball milling and mixing,and finally the nano sulfur / nitrogen-doped titanium dioxide composite cathode material with uniform morphology size is obtained. The obtained nitrogen-doped titanium dioxide is in a bar shape, has alot of holes with uniform size and uniform distribution, dissolving and shuttle effect of the polysulfide can be effectively inhibited, loss of active substances is reduced, volume expansion problem of an electrode material is solved, cycle performance is improved, specific discharge capacity is increased, and electrochemistry performance of a lithium-sulfur battery is enhanced.

Description

technical field [0001] The technical solution of the present invention relates to a composite material for preparing novel nanometer sulfur / nitrogen doped titanium dioxide, specifically a method for preparing a composite positive electrode material of nanometer sulfur / nitrogen doped titanium dioxide applied to a lithium-sulfur battery. Background technique [0002] As a novel, high-energy, non-polluting chemical power source, lithium-sulfur batteries have been widely used in energy storage fields such as portable electronic devices, electric vehicles and hybrid electric vehicles. However, with the continuous development of science and technology and social economy, energy issues and environmental issues are becoming increasingly prominent, and higher requirements are placed on the capacity, energy density, and cycle performance of lithium-ion batteries. The theoretical specific capacity of lithium-sulfur battery is as high as 1672mAh / g, and the specific energy can reach 2600...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485
CPCH01M4/364H01M4/38H01M4/485Y02E60/10
Inventor 张永光
Owner SYNERGY INNOVATION INST OF GDUT HEYUAN
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