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A kind of lithium-ion battery negative electrode red phosphorus/carbon nanotube composite material preparation method

A technology of lithium-ion batteries and carbon nanotubes, applied in battery electrodes, nanotechnology, nanotechnology, etc., to achieve the effects of improving specific capacity and cycle charge and discharge stability, simple preparation method, and environmental friendliness

Active Publication Date: 2021-07-13
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the existing red phosphorus and carbon nanotube composite technology, the present invention provides a preparation method of lithium ion battery negative electrode red phosphorus / carbon nanotube composite material

Method used

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  • A kind of lithium-ion battery negative electrode red phosphorus/carbon nanotube composite material preparation method
  • A kind of lithium-ion battery negative electrode red phosphorus/carbon nanotube composite material preparation method
  • A kind of lithium-ion battery negative electrode red phosphorus/carbon nanotube composite material preparation method

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Embodiment 1

[0029] 1) Purification of red phosphorus: ball mill red phosphorus in deionized water, hydrothermally treat at 200°C for 12 hours, and then vacuum dry;

[0030] 2) Preparation of red phosphorus dispersion: Weigh 80 mg of the red phosphorus obtained in step 1) and disperse it into a mixed solution of 50 mL of ethanol / deionized water (volume ratio 1:3), and ultrasonically disperse for 30 minutes to obtain uniform red phosphorus Dispersions;

[0031] 3) Preparation of carbon nanotube dispersion: ultrasonically disperse 20 mg of carbon nanotubes in a mixed solution of 50 mL of ethanol / deionized water (volume ratio 1:3) for 30 min to obtain a uniform carbon nanotube dispersion;

[0032] 4) Dispersion mixing: adding the red phosphorus dispersion prepared in the above step 2) to the carbon nanotube dispersion prepared in step 3), and continuing the ultrasonic dispersion for 15 minutes to obtain a uniform mixed solution;

[0033] 5) Purification of the reaction product: After the obt...

Embodiment 2

[0041] 1) Purification of red phosphorus: ball mill red phosphorus in deionized water, hydrothermally treat at 200°C for 12 hours, and then vacuum dry;

[0042] 2) Preparation of red phosphorus dispersion: Weigh 80 mg of the red phosphorus obtained in step 1) and disperse it into a mixed solution of 50 mL of ethanol / deionized water (volume ratio 1:3), and ultrasonically disperse for 30 minutes to obtain uniform red phosphorus Dispersions;

[0043] 3) Preparation of carbon nanotube dispersion: ultrasonically disperse 10 mg of carbon nanotubes in a mixed solution of 50 mL of ethanol / deionized water (volume ratio 1:3) for 30 min to obtain a uniform carbon nanotube dispersion;

[0044]4) Dispersion mixing: adding the red phosphorus dispersion prepared in the above step 2) to the carbon nanotube dispersion prepared in step 3), and continuing the ultrasonic dispersion for 15 minutes to obtain a uniform mixed solution;

[0045] 5) Purification of the reaction product: After the obta...

Embodiment 3

[0048] 1) Purification of red phosphorus: ball mill red phosphorus in deionized water, hydrothermally treat at 200°C for 12 hours, and then vacuum dry;

[0049] 2) Preparation of red phosphorus dispersion: Weigh 80 mg of the red phosphorus obtained in step 1) and disperse it into a mixed solution of 50 mL of ethanol / deionized water (volume ratio 1:3), and ultrasonically disperse for 30 minutes to obtain uniform red phosphorus Dispersions;

[0050] 3) Preparation of carbon nanotube dispersion: ultrasonically disperse 30 mg of carbon nanotubes in a mixed solution of 50 mL of ethanol / deionized water (volume ratio 1:3) for 30 minutes to obtain a uniform carbon nanotube dispersion;

[0051] 4) Dispersion mixing: adding the red phosphorus dispersion prepared in the above step 2) to the carbon nanotube dispersion prepared in step 3), and continuing to ultrasonically disperse for 5 minutes to obtain a uniform mixed solution;

[0052] 5) Purification of the reaction product: After the...

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Abstract

The invention discloses a method for preparing a negative electrode red phosphorus / carbon nanotube composite material of a lithium ion battery. In the method, the red phosphorus is evenly adsorbed on the wall of the carbon nanotube through the low-temperature liquid phase method, and the red phosphorus and the carbon nanotube composite material are obtained by virtue of the surface electrical difference between the red phosphorus and the carbon nanotube in a solvent. The method comprises the steps of purifying red phosphorus, preparing red phosphorus dispersion liquid, preparing carbon nanotube dispersion liquid, mixing dispersion liquid, purifying reaction product, freeze-drying and the like. The preparation method of the present invention is simple and environmentally friendly; in the obtained red phosphorus / carbon nanotube composite material, the red phosphorus is an amorphous nano-particle, and is uniformly attached to the surface of the carbon nanotube, has a high utilization rate, and is significantly Greatly improve the specific capacity and cycle charge and discharge stability of lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method for loading amorphous red phosphorus on the surface of carbon nanotubes, and using the obtained red phosphorus / carbon nanotube composite materials as negative electrode materials for lithium-ion batteries. Background technique [0002] The development of modern society is characterized by energy consumption. Efficient energy storage systems are the core pillars of the sustainable renewable energy industry, consumer electronics industry, and transportation industry. Due to its high specific energy, high battery voltage, wide operating temperature range, and long storage life, lithium-ion batteries occupy a core position in today's energy storage industry and are widely used in military and civilian small appliances, such as mobile phones, notebook computers, Video cameras, cameras, etc. Lithium-ion batteries use graphite materials as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/625H01M10/0525Y02E60/10
Inventor 孙黎张以河张雨张德扬
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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