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Graphene conductive agent

A graphene and conductive agent technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of decreased electrode capacity and high cost of carbon nanotubes, and achieve the effects of increasing capacity, saving costs, and reducing internal resistance of batteries

Inactive Publication Date: 2015-12-02
NINGBO POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a graphene that reduces cost, improves graphene dispersion, improves electrical conductivity and cycle life in order to solve the existing defect that the electrode capacity is reduced due to the large amount of conductive agent added, and the cost of using carbon nanotubes is high. conductive agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a graphene conductive agent, the preparation method comprising the following steps:

[0029] 1) Mix 18g graphene, 5g polyacrylonitrile fiber, 50g water, ethanol and butyrolactone mixed solvent, and ultrasonically disperse for 10min to obtain premix A; the ultrasonic frequency is 50KHz;

[0030] 2) Mix 3g of triethylenetetramine, 1g of gadolinium oxide with 50g of water, a mixed solvent of ethanol and butyrolactone, and stir at 30°C for 30 minutes to obtain premixed liquid B;

[0031] 3) Mix the premixed solution A obtained in step 1) with the premixed solution B obtained in step 2) by stirring and adding 0.5g of titanium carbide. While adding the titanium carbide, apply a magnetic field with an intensity of 4650GS. After the titanium carbide is completely added, the magnetic field The intensity was increased to 5000GS, stirred for 15min, and then ultrasonically dispersed for 30min under ultrasonic conditions; the ultrasonic frequency was 50KHz, and the g...

Embodiment 2

[0033] A method for preparing a graphene conductive agent, the preparation method comprising the following steps:

[0034] 51) Mix 23g of graphene, 8g of polyacrylonitrile fiber and 70g of ethanol and N,N-diethylethanolamine in a mixed solvent, and ultrasonically disperse for 12min to obtain premix A; the ultrasonic frequency is 55KHz;

[0035] 2) Mix 5g of triethylenetetramine, 3g of terbium oxide, and 70g of ethanol and N,N-diethylethanolamine mixed solvent, and stir at 35°C for 45min to obtain premixed liquid B;

[0036] 3) Mix the premixed solution A obtained in step 1) with the premixed solution B obtained in step 2) by stirring and adding 0.85g of titanium carbide. While adding the titanium carbide, apply a magnetic field with an intensity of 4750GS. After the titanium carbide is completely added, the magnetic field The intensity was increased to 5200GS and stirred for 18 minutes, and then ultrasonically dispersed for 40 minutes under ultrasonic conditions; the ultrasonic frequ...

Embodiment 3

[0038] A method for preparing a graphene conductive agent, the preparation method comprising the following steps:

[0039] 1) Mix 20g graphene, 10g polyacrylonitrile fiber and 80g butyrolactone with N,N-diethylethanolamine mixed solvent, and ultrasonically disperse for 25min to obtain premix A; the ultrasonic frequency is 65KHz;

[0040] 2) Mix 6g of triethylenetetramine, 5g of terbium oxide, 80g of butyrolactone and N,N-diethylethanolamine mixed solvent, and stir at 45°C for 60min to obtain premix B;

[0041] 3) Mix the premixed solution A obtained in step 1) with the premixed solution B obtained in step 2) by stirring and adding 1g of titanium carbide. While adding the titanium carbide, apply a magnetic field with an intensity of 4800GS. After the titanium carbide is completely added, change the intensity of the magnetic field Increase to 5250GS, stir for 20 minutes, and then ultrasonically disperse for 45 minutes under ultrasonic conditions; the ultrasonic frequency is 65KHz to ob...

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Abstract

The invention relates to a graphene conductive agent. The graphene conductive agent comprises, by mass, 18 to 23 parts of graphene, 5 to 10 parts of polyacrylonitrile fiber, 3 to 6 parts of triethylene tetramine, 100 to 160 parts of a solvent, 1 to 5 parts of rare earth oxide and 0.5 to 1 part of titanium carbide. The invention has the following beneficial effects: through adoption of the graphene conductive agent and excellent conductivity of graphene, the capacity of an electrode material is improved, internal resistance of a battery is reduced, and cycle life of the battery is prolonged; and the usage amount of the graphene conductive agent in preparation of a lithium ion battery is 50 to 60% of the usage amount of a conventional conductive agent, the usage amount of a binder is reduced by 18%, but 2C rate is increased by 6 to 10%, so cost is saved and the lithium ion battery is more competitive.

Description

Technical field [0001] The present invention relates to a lithium ion battery, in particular to a graphene conductive agent that reduces cost, improves conductivity and cycle life. Background technique [0002] As a new type of high-energy secondary power source, lithium-ion secondary batteries have the advantages of large specific energy, stable discharge voltage, high voltage, good low temperature performance, no pollution, superior safety performance, long storage and working life, and high utilization rate. [0003] Lithium-ion batteries in the prior art mainly use conductive graphite, acetylene black and carbon nanotubes as conductive agents. Acetylene black is a chain-like substance composed of spherical amorphous carbon particles. It is currently the most widely used conductive agent with low price. , But in order to achieve the purpose of enhancing the mutual contact between the electrode active materials, a large amount of addition is required, which causes the decrease of...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 刘春朝
Owner NINGBO POLYTECHNIC
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