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Carbon nanotube-containing carbon shell-coated silicon negative electrode material and preparation method thereof

A technology of carbon nanotubes and carbon nanotubes is applied in the field of preparation of carbon polyhedron-coated silicon negative electrode materials, and can solve the problems of uneven coating and low degree of graphitization.

Inactive Publication Date: 2020-07-10
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the silicon carbon materials prepared by the prior art have the problems of uneven coating and low degree of graphitization

Method used

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  • Carbon nanotube-containing carbon shell-coated silicon negative electrode material and preparation method thereof
  • Carbon nanotube-containing carbon shell-coated silicon negative electrode material and preparation method thereof
  • Carbon nanotube-containing carbon shell-coated silicon negative electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] Step (1) Dissolve 1.97g of dimethylimidazole and 1.76g of cobalt nitrate hexahydrate in 20ml of absolute ethanol and 20ml of methanol solution respectively until the two substances are completely dissolved.

[0022] Step (2) Add 50.0mg of silicon powder (particle size is 100nm) into the above-mentioned mixed solution dissolved in cobalt nitrate hexahydrate, stir until the silicon powder is evenly dispersed in the mixed solution, and then dissolve the dimethylimidazole Add the mixed solution, let it stand for 24 hours, and collect it by centrifuging and drying for later use.

[0023] Step (3) Put the sample collected above in a corundum boat, put it into a tube furnace, and heat it at 2°C / min to 350°C for 1.5h under an atmosphere of argon-hydrogen mixture (10% hydrogen), and then continue The temperature was raised to 600°C and kept for 3.5 hours. After the sample was cooled to room temperature, it was added to 50ml of 1mol / L sulfuric acid solution, stirred for 6 hours, ...

Embodiment 2

[0026] Step (1) Dissolve 1.97g of dimethylimidazole and 1.76g of cobalt nitrate hexahydrate in 20ml of absolute ethanol and 20ml of methanol respectively until the two substances are completely dissolved.

[0027] Step (2) Add 50.0mg of silicon powder (particle size is 100nm) into the above-mentioned mixed solution dissolved in cobalt nitrate hexahydrate, stir until the silicon powder is evenly dispersed in the mixed solution, and then dissolve the dimethylimidazole Add the mixed solution, let it stand for 24 hours, and collect it by centrifuging and drying for later use.

[0028] Step (3) Put the sample collected above in a corundum boat, put it into a tube furnace, and heat it at 2°C / min to 350°C for 1.5h under an atmosphere of argon-hydrogen mixture (10% hydrogen), and then continue The temperature was raised to 700°C and kept for 3.5 hours. After the sample was cooled to room temperature, it was added to 50ml of 1mol / L sulfuric acid solution, stirred for 6 hours, and final...

Embodiment 3

[0031] Step (1) Dissolve 1.97g of dimethylimidazole and 1.76g of cobalt nitrate hexahydrate in 20ml of absolute ethanol and 20ml of methanol respectively until the two substances are completely dissolved.

[0032] Step (2) Add 50.0mg of silicon powder (particle size is 100nm) into the above-mentioned mixed solution dissolved in cobalt nitrate hexahydrate, stir until the silicon powder is evenly dispersed in the mixed solution, and then dissolve the dimethylimidazole Add the mixed solution, let it stand for 24 hours, and collect it by centrifuging and drying for later use.

[0033] Step (3) Put the sample collected above in a corundum boat, put it into a tube furnace, and heat it at 2°C / min to 350°C for 1.5h under an atmosphere of argon-hydrogen mixture (10% hydrogen), and then continue The temperature was raised to 800°C and kept for 3.5 hours. After the sample was cooled to room temperature, it was added to 50ml of 1mol / L sulfuric acid solution, stirred for 6 hours, and final...

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Abstract

The invention discloses a carbon nanotube-containing carbon shell-coated silicon negative electrode material and a preparation method thereof. The invention belongs to the technical field of lithium ion battery anode materials. The invention aims to solve the problems that the silicon-carbon material prepared by the prior art is non-uniform in coating and the degree of graphitization is low; according to the invention, the silicon is coated in a polyhedron carbon shell covered by carbon nanotubes; the preparation method comprises the following steps: by taking cobalt nitrate hexahydrate and dimethylimidazole as raw materials and silicon as a precursor, carrying out reaction for 24 hours at room temperature by adopting a coprecipitation method to obtain a silicon-metal organic framework material; treating the obtained precursor for 3.5 h under the argon-hydrogen mixed atmosphere of 600-900 DEG C, and obtaining the carbon nanotube modified silicon-carbon negative electrode material, thecoating effect of the product is good, and excellent electrochemical performance is shown. The surface carbon layer in the material structure effectively inhibits the volume expansion of silicon, andthe carbon nanotubes on the surface of the carbon layer construct a three-dimensional conductive network, thereby improving the electronic conductivity of the material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials, and in particular relates to a preparation method of a carbon nanotube-modified carbon polyhedron-coated silicon negative electrode material. Background technique [0002] With the development of society and the advancement of science and technology, people's demand for energy is becoming more and more urgent. However, traditional fossil energy reserves are limited, and unrestrained use of fossil energy will cause serious damage to the ecological environment. Therefore, the development and utilization of new energy sources has become a hot topic in recent years. At present, the most used new energy mainly includes wind energy, solar energy and other forms. These energy acquisition methods have little impact on the ecological environment, but they have geographical limitations, and the energy supply is not continuous and stable. In order to solve these pr...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/364H01M4/386H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 聂平赵翠梅芮秉龙常立民徐天昊薛向欣王海瑞
Owner JILIN NORMAL UNIV
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