Graphene conductive agent for lithium ion battery and preparation method thereof

A lithium-ion battery and graphene technology, which is applied in the field of electrochemistry to achieve the effects of good separation effect, high electrical conductivity and improved electrical conductivity

Inactive Publication Date: 2020-04-21
武汉低维材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, the supercritical fluid method is used to assist in the dispersion and exfoliation of graphene, and then the mixed powder is further sanded and dispersed through a sand mill, so as to solve the above-mentioned existing technical problems

Method used

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  • Graphene conductive agent for lithium ion battery and preparation method thereof
  • Graphene conductive agent for lithium ion battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of preparation method of graphene conductive agent for lithium ion battery of the present embodiment, described method specifically comprises the steps:

[0039] (1) Pretreatment of graphene powder: send the graphene powder into the airflow mill, crush and peel off for 2 hours, and obtain high-quality graphene that meets the particle size requirement, uniformly dispersed layers, good fluidity, and is not easy to agglomerate Powder;

[0040] (2) 90 mg of high-quality graphene powder and 10 mg of carbon nanotubes obtained in step (1) are fully stirred and mixed in a high-speed mixing reactor to obtain high-quality graphene-carbon nanotube powders;

[0041] (3) Dissolve the mixed powder composed of 25mg high-quality graphene-carbon nanotube powder and 25mg sodium dodecylsulfonate obtained in step (2) in 50mL of N-methylpyrrolidone, and place the solution in ultrasonic Ultrasound in the washing machine for 3 hours, the ultrasonic temperature is 30°C, and the ultraso...

Embodiment 2

[0047] A kind of preparation method of graphene conductive agent for lithium ion battery of the present embodiment, described method specifically comprises the steps:

[0048] (1) Pretreatment of graphene powder: Send the graphene powder into the jet mill, crush and peel off for 2.5 hours, and obtain high-quality graphite that meets the particle size requirements, uniformly dispersed layers, good fluidity, and is not easy to agglomerate olefin powder;

[0049] (2) 60 mg of high-quality graphene powder and 10 mg of carbon nanotubes obtained in step (1) are fully stirred and mixed in a high-speed mixing reactor to obtain high-quality graphene-carbon nanotube powder;

[0050] (3) Dissolve the mixed powder composed of 25mg of high-quality graphene-carbon nanotube powder and 50mg of sodium lauryl sulfate obtained in step (2) in 50mL of acetamide, and put the solution in an ultrasonic cleaning machine for ultrasonic 2h, the ultrasonic temperature is 35°C, the ultrasonic power is 80...

Embodiment 3

[0056] A kind of preparation method of graphene conductive agent for lithium ion battery of the present embodiment, described method specifically comprises the steps:

[0057] (1) Pretreatment of graphene powder: send the graphene powder into the airflow mill, crush and peel off for 3 hours, and obtain high-quality graphene that meets the particle size requirements, uniformly dispersed layers, good fluidity, and is not easy to agglomerate Powder;

[0058] (2) 10 mg high-quality graphene powder and 30 mg carbon nanotubes obtained in step (1) are fully stirred and mixed in a high-speed mixing reactor to obtain high-quality graphene-carbon nanotube powders;

[0059] (3) Dissolve the mixed powder composed of 25 mg of high-quality graphene-carbon nanotube powder and 100 mg of polyvinylpyrrolidone obtained in step (2) in 50 mL of ethanol, put the solution in an ultrasonic cleaner for 4 hours, and the ultrasonic temperature The temperature is 40°C, the ultrasonic power is 500W, the ...

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Abstract

The invention discloses a graphene conductive agent for a lithium ion battery and a preparation method thereof, and belongs to the technical field of electrochemistry. The graphene conductive agent provided by the invention is prepared by the following method: firstly crushing and stripping graphene powder and uniformly mixing with carbon nanotubes to obtain the high-quality graphene-carbon nano tube powder; then mixing with a dispersing agent and dissolving; carrying out ultrasonic treatment and suction filtration on the obtained solution; and carrying out supercritical treatment on the filtered solid for 2-6 hours, quickly reducing the pressure after the carbon dioxide circularly flows to a preset value, finally repeating the supercritical treatment and quick pressure reduction steps insequence so that the material is subjected to multiple pressure increasing and reducing processes, finally discharging the mixed material in the autoclave, and carrying out sanding treatment. The graphene conductive agent for the lithium ion battery prepared by the invention shows ultrahigh specific capacity and excellent rate capability, the attenuation rate is only about 9% after 1000 times of circulation, and the graphene conductive agent has good cycling stability.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a graphene conductive agent for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion power battery is the power source that provides the power source for tools, mostly refers to products that require power to drive such as electric vehicles, electric trains, power transmission and substations; it has high energy and high power, high energy density, and a wide operating temperature range (-30°C ~65℃), long service life, safe and reliable, etc. However, in the related research on the development of negative electrode materials for lithium-ion batteries, the existing negative electrode capacity is limited, and the new negative electrode has a large capacity decay during the charge and discharge process. In order to further improve the electrochemical performance of lithium-ion batteries, so that they have the advanta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 常海欣李刚辉郭辉
Owner 武汉低维材料研究院有限公司
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