Lithium ion battery graphene conductive agent and preparation method thereof

A lithium-ion battery and graphene technology, applied in the field of lithium-ion batteries, can solve the problems of reduced electrode capacity and high cost of carbon nanotubes, and achieve the effects of increasing capacity, saving costs, and strong liquid absorption and retention capabilities

Active Publication Date: 2015-04-08
NINGBO VEKEN BATTERY
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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 lithium-ion battery graphene conductive agent that reduces cost, 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.

Method used

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  • Lithium ion battery graphene conductive agent and preparation method thereof

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Embodiment 1

[0029] A kind of preparation method of lithium ion battery graphene conductive agent, described preparation method comprises the following steps:

[0030] 1) Mix 25g of graphene, 5g of monoethanolamine and 50g of water, and ultrasonically disperse for 10min to obtain premix A; the ultrasonic frequency is 50KHz;

[0031] 2) Mix 10g of polyethylene glycol, 1g of rare earth gadolinium and 50g of water, and stir at 30°C for 30min to obtain premix B;

[0032] 3) Mix the premix A obtained in step 1) with the premix B obtained in step 2) and add 0.5 g of titanium carbide. While adding titanium carbide, apply a magnetic field with a strength of 3000 GS. After the titanium carbide is completely added, turn the magnetic field Increase the strength to 5000GS, stir for 15 minutes, and then disperse ultrasonically for 30 minutes under ultrasonic conditions; the ultrasonic frequency is 50KHz to obtain a graphene conductive agent for lithium-ion batteries.

Embodiment 2

[0034] A kind of preparation method of lithium ion battery graphene conductive agent, described preparation method comprises the following steps:

[0035] 51) Mix 28g of graphene, 8g of monoethanolamine and 70g of ethanol, and ultrasonically disperse for 12min to obtain premix A; the ultrasonic frequency is 55KHz;

[0036] 2) Mix 12g of polyethylene glycol, 3g of rare earth element terbium and 70g of ethanol, and stir at 35°C for 45min to obtain premix B;

[0037] 3) Mix the premix A obtained in step 1) with the premix B obtained in step 2) and add 0.85 g of titanium carbide. While adding titanium carbide, apply a magnetic field with a strength of 4000 GS. After the titanium carbide is completely added, turn 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 frequency was 55KHz, and a graphene conductive agent for lithium-ion batteries was obtained. ...

Embodiment 3

[0039] A kind of preparation method of lithium ion battery graphene conductive agent, described preparation method comprises the following steps:

[0040] 1) Mix 30g of graphene, 10g of monoethanolamine and 80g of acetone, and ultrasonically disperse for 25 minutes to obtain premix A; the ultrasonic frequency is 65KHz;

[0041] 2) Mix 15g of polyethylene glycol, 5g of rare earth element terbium and 80g of acetone, and stir at 45°C for 60min to obtain premix B;

[0042] 3) Mix the premix A obtained in step 1) with the premix B obtained in step 2) and add 1g of titanium carbide. While adding titanium carbide, apply a magnetic field with a strength of 4500GS. After the titanium carbide is completely added, turn the magnetic field Increase the strength to 5500GS, stir for 20 minutes, and then disperse ultrasonically for 45 minutes under ultrasonic conditions; the ultrasonic frequency is 65KHz to obtain a graphene conductive agent for lithium-ion batteries.

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Abstract

The invention relates to a lithium ion battery graphene conductive agent and a preparation method thereof. The graphene conductive agent comprises the following components by mass: 25-30 parts of graphene, 10-15 parts of polyethylene glycol, 5-10 parts of monoethanolamine, 100-160 parts of a solvent, 1-5 parts of a rare earth element, and 0.5-1 part of titanium carbide. According to the invention, the graphene conductive agent utilizes the excellent conductivity of graphene to enhance the capacity of an electrode material, reduce the battery internal resistance, and improve the battery cycle life. The dosage of the graphene conductive agent only accounts for 50-60% of that of existing conductive agents during preparation of a lithium ion battery, the binder dosage is reduced by 18%, and the 2C multiplying power is improved by 6-10%, the cost is saved, and the lithium ion battery can be more competitive.

Description

technical field [0001] The invention relates to lithium-ion batteries, in particular to a graphene conductive agent for lithium-ion batteries with reduced cost, improved electrical conductivity and cycle life and a preparation method thereof. Background technique [0002] As a new type of high-energy secondary power supply, 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 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 electrode active materials, the amount of addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01B1/04H01B13/00
CPCC01B32/182C01B32/184H01M4/625H01M10/0525Y02E60/10
Inventor 曹长河潘美姿颜雪冬马兴立赵亚
Owner NINGBO VEKEN BATTERY
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