A kind of porous cobalt sulfide nanoflower and its preparation method and application

A technology of cobalt sulfide and nanoflowers, which is applied in the fields of chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems such as the difficulty in preparing three-dimensional porous cobalt sulfide, and achieve good industrialization prospects, excellent charge and discharge performance, and simple operation process Effect

Active Publication Date: 2021-12-31
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for now, the one-step preparation of three-dimensional porous cobalt sulfide is still very difficult

Method used

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  • A kind of porous cobalt sulfide nanoflower and its preparation method and application
  • A kind of porous cobalt sulfide nanoflower and its preparation method and application
  • A kind of porous cobalt sulfide nanoflower and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Prepare 200mL of a mixed solution of absolute ethanol and water, and the ratio of water to ethanol is 9:1.

[0032] (2) 0.582g of cobalt nitrate hexahydrate, 5g of urea, 0.3g of PVP (average molecular weight 8000),

[0033] Disperse 0.3g of P123 in the above mixed solution, sonicate for 20min until completely dissolved; then add 0.5g of L-cysteine, and ultrasonically stir until completely dissolved;

[0034] (3) Transfer the above mixed solution to a reaction flask with a reflux condensation device at 85°C for 6h;

[0035] (4) The material obtained after the above reaction is collected by filtration, and after repeated cleaning, it is vacuum-dried to obtain a black powder, which is put into a tube furnace and sintered at a high temperature of 500 ° C for 6 h under an inert atmosphere Ar to prepare porous cobalt sulfide nanoparticles. flower material.

[0036] (5) After fully grinding the sintered material, mix it with carbon black and carboxymethyl cellulose in a ...

Embodiment 2

[0038] (1) Prepare 200mL of a mixed solution of absolute ethanol and water, and the ratio of water to ethanol is 8:1.

[0039] (2) Disperse 0.145g of cobalt nitrate hexahydrate, 2.9g of urea, 0.29g of PVP (average molecular weight 8000), and 0.29g of P123 in the above mixed solution, and ultrasonically 20min until completely dissolved; then add 0.29g of L-cysteine Acid, ultrasonically stirred until completely dissolved;

[0040] (3) Transfer the above mixed solution to a reaction flask with a reflux condensation device at 120°C for 3h;

[0041] (4) The material obtained after the above reaction is collected by filtration, and after repeated cleaning, it is vacuum-dried to obtain a black powder, which is put into a tube furnace and sintered at a high temperature of 400 ° C for 6 h under an inert atmosphere Ar to prepare porous cobalt sulfide nanoparticles. flower material.

[0042] (5) After fully grinding the sintered material, mix it with carbon black and carboxymethyl cell...

Embodiment 3

[0044] (1) Prepare 200mL of a mixed solution of absolute ethanol and water, and the ratio of water to ethanol is 10:1.

[0045] (2) Disperse 1.45g of cobalt nitrate hexahydrate, 1.45g of urea, 0.29g of PVP (average molecular weight 8000), and 0.29g of P123 in the above mixed solution, and ultrasonically 20min until completely dissolved; then add 2.9g of L-cysteine Acid, ultrasonically stirred until completely dissolved;

[0046] (3) Transfer the above mixed solution to a hydrothermal reaction kettle at 100°C for 24h;

[0047](4) The material obtained after the above reaction is collected by filtration, and after repeated cleaning, it is vacuum-dried to obtain a black powder. The powder is put into a tube furnace and sintered at 600 ° C for 3 h in an inert atmosphere to prepare porous cobalt sulfide nanoparticles. flower material.

[0048] (5) After fully grinding the sintered material, mix it with carbon black and carboxymethyl cellulose in a ratio of 70:15:15, and dry it in...

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Abstract

The invention discloses a porous cobalt sulfide nanoflower and its preparation method and application. The invention uses a high-proportion water mixed solution as a confined solvent, cobalt nitrate hexahydrate as a metal cobalt source, and L-cysteine ​​as a sulfur source. Using P123 and PVP as surfactants, templates and pore-forming agents, react at a fixed temperature in a closed reactor with a reflux device, the prepared product is washed and dried, and then sintered at a high temperature under an inert atmosphere to synthesize Flower-like cobalt sulfide with a porous structure. The invention also discloses the material and its application. The preparation method of the present invention has the advantages of cheap and easy-to-obtain raw materials, simple equipment, low reaction temperature, good repeatability, etc., overcomes the environmental pollution problem caused by the use of organic solvents in the previous synthesis methods, and overcomes the high temperature preparation of cobalt sulfide in the previous synthesis methods Process complex issues such as high-pressure hydrothermal conditions. The obtained products have broad application prospects in the fields of catalysis, energy storage, and material science.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for sodium batteries, in particular to a porous cobalt sulfide nanoflower and its preparation method and application. Background technique [0002] Na-ion batteries have recently attracted great interest due to their low cost, abundant resources, and improved safety compared to lithium-ion batteries. However, because sodium ions have a larger ionic radius than lithium ions, resulting in lower specific capacity, lower rate capacity, and significant volume effect, the cycle life is shortened. with Li + Compared to Na + has a larger radius, about Li + 155% of , which leads to the fact that well-developed electrode materials in lithium batteries are significantly hindered from being used in sodium batteries due to insufficient lattice spacing. Therefore, looking for a + It is difficult to find suitable new electrode materials that can generate ions and allow reversible interc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00H01M4/58H01M10/054
CPCY02E60/10
Inventor 张文惠岳鹿谢宇金子纯甘磊成鑫丽关荣锋
Owner YANCHENG INST OF TECH
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