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Zinc sulfide and carbon nanotube covalent coupling composite material and preparation method and application thereof

A technology of acidifying carbon nanotubes and carbon nanotubes, which is applied in the direction of zinc sulfide, chemical instruments and methods, carbon compounds, etc., can solve the problems of poor electronic conductivity and ion conductivity of transition metal sulfides, and limit development, and achieve excellent magnification Performance, long-term stability, effect of promoting electron/ion transfer

Pending Publication Date: 2022-04-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the poor electronic and ionic conductivity of transition metal sulfides limits their further development

Method used

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  • Zinc sulfide and carbon nanotube covalent coupling composite material and preparation method and application thereof
  • Zinc sulfide and carbon nanotube covalent coupling composite material and preparation method and application thereof
  • Zinc sulfide and carbon nanotube covalent coupling composite material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0020] A method for preparing a zinc sulfide and carbon nanotube covalently coupled composite material, comprising the following steps:

[0021] Add 1g of multi-walled carbon nanotubes to a 500ml round bottom flask, then add 250ml of 1M sulfuric acid solution for ultrasonic dispersion, then slowly add 2g of KMnO while stirring 4 powder, stirred for half an hour, heated to 120°C and refluxed for 12 hours to obtain the oxide material;

[0022] At room temperature, add the oxide material into 20ml of 12mol / l concentrated hydrochloric acid, and carry out acidification under stirring conditions for 0.5h to obtain acidified carbon nanotubes, which are washed and dried for later use;

[0023] Ultrasonic disperse 0.1g of dry acidified carbon nanotubes in 100ml of water, add 0.5g of zinc acetate and 0.25g of thiourea in turn, and stir thoroughly for half an hour to obtain a mixed solution; pour the mixed solution into a stainless steel reaction kettle, and then react the stainless stee...

Embodiment 2

[0025] A method for preparing a zinc sulfide and carbon nanotube covalently coupled composite material, comprising the following steps:

[0026] Add 1g of multi-walled carbon nanotubes to a 500ml round bottom flask, then add 250ml of 1M sulfuric acid solution for ultrasonic dispersion, then slowly add 2g of KMnO while stirring 4 powder, stirred for half an hour, heated to 120°C and refluxed for 12 hours to obtain the oxide material;

[0027] At room temperature, add the oxide material into 20ml of 12mol / l concentrated hydrochloric acid, and carry out acidification under stirring conditions for 0.5h to obtain acidified carbon nanotubes, which are washed and dried for later use;

[0028] Ultrasonically disperse 0.1g of dry acidified carbon nanotubes in 100ml of water, add 1g of zinc acetate and 1g of thiourea in turn, stir thoroughly for half an hour to obtain a mixed solution, pour the mixed solution into a stainless steel reaction kettle, and then place the stainless steel rea...

Embodiment 3

[0030] A method for preparing a zinc sulfide and carbon nanotube covalently coupled composite material, comprising the following steps:

[0031] Add 1g of multi-walled carbon nanotubes to a 500ml round bottom flask, then add 250ml of 1M sulfuric acid solution for ultrasonic dispersion, then slowly add 2g of KMnO while stirring 4 powder, stirred for half an hour, heated to 120°C and refluxed for 12 hours to obtain the oxide material;

[0032] At room temperature, add the oxide material into 20ml of 12mol / l concentrated hydrochloric acid, and carry out acidification under stirring conditions for 0.5h to obtain acidified carbon nanotubes, which are washed and dried for later use;

[0033] Ultrasonically disperse 0.1g of dry acidified carbon nanotubes in 100ml of water, add 0.5g of zinc acetate and 15g of thiourea in turn, and stir thoroughly for half an hour to obtain a mixed solution. Pour the mixed solution into a stainless steel reaction kettle, and then put the stainless stee...

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Abstract

The invention discloses a zinc sulfide and carbon nanotube covalent coupling composite material and a preparation method and application thereof.The preparation method of the material comprises the following steps that carbon nanotubes are dispersed in a sulfuric acid solution, permanganate is added for an oxidation reaction, and an oxide material is obtained; adding the oxide material into concentrated hydrochloric acid for acidification to obtain an acidified carbon nanotube; and dispersing the acidified carbon nanotubes, zinc acetate and thiourea in water to obtain a mixed solution, and heating the mixed solution to carry out hydrothermal reaction, thereby obtaining the zinc sulfide and carbon nanotube covalent coupling composite material. In the composite material, the zinc sulfide and the carbon nanotubes are combined through strong covalent bonds, the covalent bonds provide effective channels for electron conduction, the link between the zinc sulfide and the carbon nanotubes is not broken in the long-term circulation process, and the stability of the material structure is improved. Meanwhile, the covalent bond is beneficial to promoting electron / ion transfer, so that the material has long-term stability and excellent rate capability.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a zinc sulfide-carbon nanotube covalently coupled composite material and a preparation method and application thereof. Background technique [0002] Since the 1990s, lithium-ion battery technology has achieved good development due to its high energy density and cycle stability. At present, the electrochemical performance of lithium-ion battery anode materials is one of the main factors restricting the development of high-performance lithium-ion batteries. Although graphite with a layered structure has become a commercial lithium-ion battery anode material, its theoretical capacity is only 372mAh / g, and its layered structure will be affected to a certain extent due to repeated intercalation and extraction of lithium ions during charging and discharging. damage, resulting in irreversible effects on battery capacity and cycle stability. In order to improve the ca...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525C01B32/168C01G9/08
CPCH01M4/5815H01M4/625H01M10/0525C01B32/168C01G9/08H01M2004/027C01P2004/80Y02E60/10
Inventor 汪杰宣健张壁曹勇苏峰董骄王从周滕威
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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