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Method for preparing ungraphitised carbon and polypyrrole collaboratively coated sulfur

A technology of non-graphitized carbon and polypyrrole, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., to achieve the effects of simple and easy experimental operation, increased electrical conductivity, and reduced experimental cost and process complexity

Inactive Publication Date: 2017-06-20
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent with the publication number CN104779376A mentions that in the carbon / sulfur composite material coated with microporous carbon, a similar "chemical bond" is formed between the microporous carbon coating layer and the carbon-sulfur composite material, making it tightly combined and better Inhibit sulfur and discharge products from dissolving in the electrolyte, improve the utilization rate of sulfur, and then improve the cycle stability of lithium-sulfur batteries, but the capacity retention rate needs to be further improved

Method used

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  • Method for preparing ungraphitised carbon and polypyrrole collaboratively coated sulfur
  • Method for preparing ungraphitised carbon and polypyrrole collaboratively coated sulfur
  • Method for preparing ungraphitised carbon and polypyrrole collaboratively coated sulfur

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Prepare tubular polypyrrole by template method: add 1.01 g of ferric chloride hexahydrate to 50 ml of methyl orange solution, stir at room temperature for 5 minutes; then add 0.1 g of distilled pyrrole monomer dropwise, React for 6 hours at room temperature to obtain tubular polypyrrole;

[0024] (2) Placing the tubular polypyrrole obtained in step (1) in a tube furnace protected by argon at 700 degrees Celsius for heat treatment for 2 hours to obtain non-graphitized carbon;

[0025] (3) Add 0.1 g of the non-graphitized carbon obtained in step (2) to 100 ml of deionized water for ultrasonic for 10 minutes. After the dispersion is uniform, add 5.12 g of sodium thiosulfate pentahydrate and add dropwise with a pipette Concentrated hydrochloric acid 3ml, stirred at room temperature for 6 hours; then put the reacted mixture in an ice-water bath, continue to stir the reaction, add 1.31 g of sodium p-toluenesulfonate, and add 0.1 g of pyrrole monomer to the mixture ; Then diss...

Embodiment 2

[0028] (1) Prepare tubular polypyrrole by template method: add 2.03 g of ferric chloride hexahydrate to 150 ml of methyl orange solution, stir at room temperature for 15 minutes; then add 0.5 g of rectified pyrrole monomer dropwise, React for 24 hours at room temperature to obtain tubular polypyrrole;

[0029] (2) Place the tubular polypyrrole obtained in step (1) in a tube furnace protected by argon for heat treatment at 900 degrees Celsius for 5 hours to obtain non-graphitized carbon;

[0030] (3) Add 0.3 g of the non-graphitized carbon obtained in step (2) to 450 ml of deionized water for ultrasonic for 30 minutes. After the dispersion is uniform, add 9.93 g of sodium thiosulfate pentahydrate and add dropwise with a pipette Concentrated hydrochloric acid 8ml, stirred at room temperature for 24 hours; then put the reacted mixture in an ice-water bath, continue to stir the reaction, add 2.62 g of sodium p-toluenesulfonate, and add 0.3 g of pyrrole monomer to the mixture; Then dis...

Embodiment 3

[0034] (1) Prepare tubular polypyrrole by template method: add 1.21 g of ferric chloride hexahydrate to 75 ml of methyl orange solution and stir for 8 minutes at room temperature; then add 0.3 g of distilled pyrrole monomer dropwise, React for 12 hours at room temperature to obtain tubular polypyrrole;

[0035] (2) Placing the tubular polypyrrole obtained in step (1) in a tube furnace protected by argon at 750 degrees Celsius for heat treatment for 3 hours to obtain non-graphitized carbon;

[0036] (3) Add 0.15 g of the non-graphitized carbon obtained in step (2) to 200 ml of deionized water for 20 minutes, and after the dispersion is uniform, add 6.30 g of sodium thiosulfate pentahydrate, and add dropwise with a pipette Concentrated hydrochloric acid 4ml, stirred at room temperature for 8 hours; then put the reacted mixture in an ice-water bath, continue to stir the reaction, add 3.30 g of sodium p-toluenesulfonate, add 0.18 g of pyrrole monomer to the mixture; Then, 1.50 g of fe...

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Abstract

The invention discloses a method for preparing ungraphitised carbon and polypyrrole collaboratively coated sulfur, and belongs to the technical field of preparation processes of advanced composite materials. An ungraphitised carbon / sulfur / polypyrrole composite material utilizes ungraphitised carbon as a conductive modified phase and utilizes polypyrrole as a coating phase so as to enhance the charging and discharging cycle performance of the composite material. The ungraphitised carbon / sulfur / polypyrrole composite material is prepared from sodium pentahydrate, concentrated hydrochloric acid, pyrrole monomers, methyl orange, hexahydrate ferric chloride, sodium p-toluenesulfonate and deionized water by carrying out an in-situ precipitation reaction, an in-situ chemical oxidation reaction, drying and heat treatment. The method is simple in production process and low in cost, and the prepared ungraphitised carbon / sulfur / polypyrrole composite material has excellent electrochemical performance.

Description

Technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of non-graphitized carbon and polypyrrole co-coated sulfur, and belongs to the technical field of advanced composite material preparation technology. Background technique [0002] Lithium-sulfur battery is a kind of high-capacity energy storage system with great development prospects, usually using sulfur or sulfur-containing compounds as the positive electrode. Sulfur is one of the most abundant elements in nature. When elemental sulfur is paired with metallic lithium, its theoretical specific capacity can be as high as 1675 mAh / g, and its theoretical energy density is as high as 2600 watt-hours / kg, which is far beyond the current level. Commercialized lithium-ion batteries are also the representative and direction of secondary batteries in the future. Compared with other batteries, the main advantages of lithium-sulfur batteries are: (1) High ener...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/38H01M4/60H01M4/62
CPCH01M4/362H01M4/366H01M4/38H01M4/583H01M4/602H01M4/622H01M4/625Y02E60/10
Inventor 金波李珊珊蒋青
Owner JILIN UNIV
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