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Nitrogen-doped carbon nanotube adopting hierarchical structure and preparation method

A technology of nitrogen-doped carbon and carbon nanotubes, which is applied in the field of preparation of nitrogen-doped carbon nanotubes, can solve the problems of difficulty in meeting the application requirements of lithium-ion battery anode materials, short cycle life, and complicated processes, and achieve easy operation, The effect of low cost and simple process

Inactive Publication Date: 2016-04-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some progress has been made on nitrogen-doped carbon lithium-ion battery anode materials, the nitrogen-doped carbon materials described in these literature collections have complex processes, high costs, or short cycle life, which are difficult to meet the requirements of lithium-ion battery anode materials. Material Application Requirements

Method used

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  • Nitrogen-doped carbon nanotube adopting hierarchical structure and preparation method
  • Nitrogen-doped carbon nanotube adopting hierarchical structure and preparation method
  • Nitrogen-doped carbon nanotube adopting hierarchical structure and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1) Measure 10.0 mmol of aniline and 0.52 mmol of phytic acid into 50 mL of deionized water, stir magnetically for 30 minutes and place in an ice bath for 30 minutes. Keep stirring during the ice bath;

[0036] 2) Weigh 17.3mmol ammonium persulfate and add it into 50mL deionized water, and ice bath for 10 minutes;

[0037] 3) Turn off the magnetic stirring in step 1), then quickly pour the solution in step 2) into the mixed solution in step 1), put it in an ice bath under the same conditions as in step 1) for 12 hours, wash with deionized water and ethanol for 3 After that, put it in the oven to dry;

[0038] 4) Grind the dried sample obtained in step 3), and then keep it in an air-filled tube furnace at a heating rate of 5 °C / min at 200 °C for 2 hours, wait for the tube furnace to cool naturally, and take out the obtained product;

[0039] 5) Grind the product obtained in step 4), and then in a tube furnace filled with nitrogen, heat at 500°C for 10 hours at a heating...

Embodiment 2

[0043] 1) Measure 10.0 mmol of aniline and 0.21 mmol of phytic acid into 50 mL of deionized water, stir magnetically for 30 minutes and place in an ice bath for 20 minutes. Keep stirring during the ice bath;

[0044] 2) Weigh 17.3mmol ammonium persulfate and add it into 50mL deionized water, and ice bath for 10 minutes;

[0045]3) Turn off the magnetic stirring in step 1), then quickly pour the solution in step 2) into the mixed solution in step 1), put it in an ice bath under the same conditions as in step 1) for 24 hours, wash with deionized water and ethanol for 3 After that, put it in the oven to dry;

[0046] 4) Grind the dried sample obtained in step 3), and then keep it in an air-filled tube furnace at a heating rate of 5 °C / min at 150 °C for 5 hours, wait for the tube furnace to cool naturally, and take out the obtained product;

[0047] 5) Grind the product obtained in step 4), then in a tube furnace filled with nitrogen, at a heating rate of 15 °C / min, keep it warm...

Embodiment 3

[0049] 1) Measure 10.0mmol of aniline and 0.89mmol of sulfuric acid into 50mL of deionized water, stir magnetically for 10 minutes, mix and place in an ice bath for 60 minutes, and keep stirring during the ice bath;

[0050] 2) Weigh 5 mmol of ferric chloride and add it to 20 mL of deionized water, and bathe in ice for 10 minutes;

[0051] 3) Turn off the magnetic stirring in step 1), then quickly pour the solution in step 2) into the mixed solution in step 1), put it in an ice bath under the same conditions as in step 1) for 24 hours, wash with deionized water and ethanol for 3 After that, put it in the oven to dry;

[0052] 4) Grind the dried sample obtained in step 3), and then keep it in an air-filled tube furnace at a heating rate of 1 °C / min at 200 °C for 5 hours, wait for the tube furnace to cool naturally, and take out the obtained product;

[0053] 5) Grind the product obtained in step 4), and then in a tube furnace filled with nitrogen, heat at 700°C for 10 hours a...

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Abstract

The invention relates to a nitrogen-doped carbon nanotube adopting a hierarchical structure and a preparation method. The material is doped with nitrogen and adopts the obvious hierarchical structure, and the carbon nanotube comprises tinier nitrogen-doped carbon particles. The preparation method comprises steps as follows: aniline is uniformly dispersed in an acid solution through stirring, an aniline suspension is obtained and subjected to ice bath treatment for 20-60 min, and stirring is kept in the ice bath process; an oxidizing agent is dissolved in deionized water through stirring and subjected to ice bath treatment for 5-30 min; stirring is stopped, an oxidizing agent solution is quickly poured into an aniline suspension mixed solution and subjected to ice bath treatment for 8-28 h, centrifugal washing is performed by the aid of deionized water and ethanol until a supernatant is clarified, and a sample is dried in an oven; the dried sample is ground, subjected to heat treatment in air and naturally cooled; a treated composite is calcined at the high temperature in an inert atmosphere and naturally cooled. The nitrogen-doped carbon nanotube has the advantages of high capacity, good rate capability and good circulating performance and can be used as an anode material for a lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of nitrogen-doped carbon nanotubes and a preparation method thereof. Background technique [0002] Graphite (including natural graphite and artificial graphite) is used as a negative electrode material for traditional commercial lithium-ion batteries. Due to its low theoretical capacity (372mAh / g), low cycle life, and poor rate performance, it greatly limits its application in lithium-ion battery negative electrodes. applications in the field of materials. In order to further meet the needs of high-power, high-capacity energy storage devices (such as portable electronic devices, storage base stations, and electric vehicles, etc.), domestic and foreign researchers have been committed to research and development of high-capacity, good cycle stability, and low-cost lithium batteries. Ion battery anode material. Nitrogen-doped carbon not only has a higher lithium-ion storage capacity than conventional commerc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/583H01M4/62
CPCH01M4/583H01M4/625Y02E60/10
Inventor 木士春何婷张伟张杰
Owner WUHAN UNIV OF TECH
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