Preparation method and application of nitrogen-doped carbon nanotube loaded phosphorus-doped cobaltosic oxide composite material

A technology of cobalt tetroxide and nitrogen-doped carbon, which is applied to carbon nanotubes, carbon compounds, chemical instruments and methods, etc., can solve the problems of low specific capacity and performance to be improved, achieve good electrochemical performance, and promote redox process. , strong adsorption effect

Active Publication Date: 2020-07-03
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific capacity of lithium-sulfur batteries using this separator is not high at the first discharge and after 50 cycles, and the performance needs to be improved.

Method used

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  • Preparation method and application of nitrogen-doped carbon nanotube loaded phosphorus-doped cobaltosic oxide composite material
  • Preparation method and application of nitrogen-doped carbon nanotube loaded phosphorus-doped cobaltosic oxide composite material
  • Preparation method and application of nitrogen-doped carbon nanotube loaded phosphorus-doped cobaltosic oxide composite material

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Embodiment 1

[0032] A method for preparing nitrogen-doped carbon nanotube-supported phosphorus-doped cobalt tetroxide composite material, comprising the following steps:

[0033] (1) Mix water, ethanol and hydrochloric acid to obtain a mixed solution A, wherein the volume ratio of water to ethanol is 1:2, and the concentration of hydrochloric acid is 0.8mol / L, add aniline solution to the mixed solution A, and stir to obtain a mixed solution B, wherein the volume ratio of the aniline solution to the mixed solution A is 1:38; then add carbon nanotubes with a diameter of 50-100 nm to the mixed solution B according to a liquid-solid ratio of 3:1, and stir to obtain a mixture C;

[0034] (2) Adjust the temperature of mixture C in step (1) to 0°C, slowly add ammonium persulfate solution to mixture C, and keep stirring until the solution turns dark blue, indicating that polyaniline is coated on the surface of carbon nanotubes ;

[0035] (3) Add the product obtained in step (2) to 0.5 mol / L exces...

Embodiment 2

[0040] A method for preparing nitrogen-doped carbon nanotube-supported phosphorus-doped cobalt tetroxide composite material, comprising the following steps:

[0041] (1) Mix water, ethanol and hydrochloric acid to obtain a mixed solution A, wherein the volume ratio of water to ethanol is 1:2, and the concentration of hydrochloric acid is 1.0mol / L, add aniline solution to the mixed solution A, and stir evenly to obtain a mixed solution B, wherein the volume ratio of the aniline solution to the mixed solution A is 1:40; then add carbon nanotubes with a diameter of 50-150 nm to the mixed solution B according to a liquid-solid ratio of 4:1, and stir to obtain a mixture C;

[0042] (2) Adjust the temperature of mixture C in step (1) to 5°C, slowly add ammonium persulfate solution to mixture C, and keep stirring until the solution turns dark blue, indicating that polyaniline is coated on the surface of carbon nanotubes ;

[0043] (3) Add the product obtained in step (2) into 0.8mol...

Embodiment 3

[0048] A method for preparing nitrogen-doped carbon nanotube-supported phosphorus-doped cobalt tetroxide composite material, comprising the following steps:

[0049] (1) Mix water, ethanol and hydrochloric acid to obtain a mixed solution A, wherein the volume ratio of water to ethanol is 1:2, and the concentration of hydrochloric acid is 1.2mol / L. Add aniline solution to the mixed solution A, and stir to obtain a mixed solution B, wherein the volume ratio of the aniline solution to the mixed solution A is 1:42; then add carbon nanotubes with a diameter of 50-200nm to the mixed solution B according to a liquid-solid ratio of 4:1, and stir to obtain a mixture C;

[0050] (2) Adjust the temperature of mixture C in step (1) to 10°C, slowly add ammonium persulfate solution to mixture C, and keep stirring until the solution turns dark blue, indicating that polyaniline is coated on the surface of carbon nanotubes ;

[0051] (3) Add the product obtained in step (2) to an excess cobal...

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Abstract

The invention provides a preparation method and application of a nitrogen-doped carbon nanotube loaded phosphorus-doped cobaltosic oxide composite material, and belongs to the technical field of composite materials. The method comprises the following steps: firstly, preparing a nitrogen-doped carbon nanotube, then adding a cobalt source to obtain a Co / NCNT material, oxidizing in an oxygen atmosphere to obtain the nitrogen-doped carbon nanotube loaded cobaltosic oxide composite material, and phosphatizing in an argon atmosphere to obtain the nitrogen-doped carbon nanotube loaded phosphorus-doped cobaltosic oxide composite material. According to the scheme, on one hand, a good conductive channel is provided, on the other hand, the phosphorus-doped cobaltosic oxide not only has relatively strong adsorbability to lithium polysulfide, but also can be used as a catalyst to effectively promote the redox process of the lithium-sulfur battery, so that the adsorption-diffusion-conversion processof the lithium polysulfide is accelerated to be carried out orderly, and the overall performance of the battery is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of composite materials, in particular to a preparation method and application of nitrogen-doped carbon nanotube-supported phosphorus-doped tricobalt tetroxide composite material. 【Background technique】 [0002] With the mature development of new energy technology, widely used lithium-ion batteries have been difficult to meet the market demand. Therefore, new next-generation secondary batteries have been born in recent years, including lithium-air batteries, zinc-air batteries, and lithium-sulfur batteries. Lithium-sulfur batteries therefore have a high theoretical specific capacity (1675mAh g -1 ), specific energy (2600wh·kg -1 ) and low cost and environmental friendliness, it has been widely concerned and studied by researchers, and has become an important research direction for the next generation of lithium batteries. [0003] A lithium-sulfur battery is composed of a positive electrode sulfur compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/168C01G51/04H01M2/16H01M10/0525B82Y30/00B82Y40/00H01M50/431
CPCC01B32/168C01G51/04H01M10/0525B82Y30/00B82Y40/00C01B2202/36C01B2202/22C01P2004/80C01P2006/40H01M50/431Y02E60/10
Inventor 马兆玲吕丁娇李庆余刘葵李前宇黄有国王红强
Owner GUANGXI NORMAL UNIV
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