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Three-dimensional network graphene for lithium battery and preparing method thereof

A three-dimensional network, graphene technology, applied in battery electrodes, circuits, electrical components and other directions, can solve the problems of difficulty in ensuring the purity of graphene, difficulty in industrial scale production, cumbersome preparation process, etc., and achieves low comprehensive cost, good crystallinity, high purity effect

Active Publication Date: 2015-10-21
XIAMEN KNANO GRAPHENE TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This three-dimensional graphene preparation method requires relatively harsh growth conditions, and the preparation process is relatively cumbersome, relying on the use of guide templates, which are difficult to remove, expensive, and difficult to achieve industrial scale production.
In addition, transition metal or metal catalysts are used in the preparation process, so it is difficult to ensure the purity of graphene, so it is not suitable for energy materials such as lithium battery electrodes.

Method used

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  • Three-dimensional network graphene for lithium battery and preparing method thereof
  • Three-dimensional network graphene for lithium battery and preparing method thereof
  • Three-dimensional network graphene for lithium battery and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Fully mix 2g of high-purity expanded graphite, 0.1g of sodium dodecylbenzenesulfonate, 0.1g of polyvinyl alcohol, 0.005g of polyoxypropanolamine ether defoamer and 95g of water, and pass the mixture through high-shear Cut emulsifier to obtain viscous few-layer graphene slurry;

[0043] (2) Add 0.01 g of sodium polyacrylate to the graphene slurry in step (1), shear at high speed for 2 hours to obtain a composite slurry, and coat the composite slurry on the metal aluminum foam porous material (micropores), Vacuumize the composite slurry to absorb into the pores;

[0044] (3) Place the metal aluminum foam porous material adsorbed with graphene slurry in step (2) in a high-temperature atmosphere (1200°C) protected by nitrogen gas, take it out after carbonization for 3 hours and cool it down, and then place the adsorbed three-dimensional network graphene The powdered metal aluminum foam porous material is placed in deionized water, stirred rapidly to suspend the graphen...

Embodiment 2

[0046] (1) Fully mix 5g of high-purity expanded graphite, 0.3g of sodium lauryl sulfate, 0.3g of polyvinylpyrrolidone, 0.01g of polyoxypropanolamine ether defoamer and 97.8g of water, and pass the mixture through high-shear The emulsifier obtains a viscous few-layer graphene slurry;

[0047] (2) Add 0.05g of sodium polyacrylate to the graphene slurry in step (1), emulsify for 1 hour to obtain a composite slurry, coat the composite slurry on the metal aluminum foam porous material (micropores), and vacuumize Adsorb the composite slurry into the pores;

[0048] (3) Put the metal aluminum foam porous material adsorbed with graphene slurry in step (2) in a high-temperature atmosphere protected by nitrogen at 1200°C, take it out after carbonization for 4 hours, and cool it, and then place the adsorbed three-dimensional network graphene powder The metal aluminum foam porous material is placed in deionized water, stirred rapidly to suspend graphene powder on the surface of deionized...

Embodiment 3

[0050] (1) Fully mix 3g of high-purity expanded graphite, 0.2g of sodium dodecylbenzenesulfonate, 0.2g of polyoxyethylene, 0.08g of polydimethylsiloxane defoamer and 96.5g of water, and pass the mixture through High-shear emulsifier to obtain viscous few-layer graphene slurry;

[0051] (2) Add 0.25g sodium carboxymethyl cellulose to the graphene slurry in step (1), stir vigorously for 1.5 hours to obtain a composite slurry, and coat the composite slurry on the metal aluminum foam porous material (microporous) On, vacuumize the composite slurry to absorb into the pores;

[0052] (3) Put the metal aluminum foam porous material adsorbed with graphene slurry in step (2) in a high-temperature atmosphere protected by nitrogen at 1200°C, take it out after carbonization for 4 hours, and cool it, and then place the adsorbed three-dimensional network graphene powder The metal aluminum foam porous material is placed in deionized water, stirred rapidly to suspend graphene powder on the s...

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Abstract

The invention relates to three-dimensional network graphene for a lithium battery and a preparing method thereof. The preparing method of the three-dimensional network graphene for the lithium battery comprises the steps that firstly, high-purity expanded graphite, an anion type organic surface active agent, a dispersing agent, an antifoaming agent and a solvent are fully mixed, so that thick few-layer graphene slurry is obtained; liquid swelling high polymer materials are added, composite slurry is obtained after even mixing, and the composite slurry is coated in holes of porous foam materials; finally, the porous foam materials are fully carbonized and then are further processed, so that three-dimensional network graphene powder is obtained. The graphene prepared through the method is of a porous network structure on the microscopic scale, and thus the graphene is high in specific surface area, high in conductivity, high in heat conductivity and good in electrolyte wettability; when the graphene is mixed into positive electrode and negative electrode materials of the lithium battery for manufacturing pole pieces, the electron conduction can be effectively improved, the internal resistance of the battery can be greatly lowered, the amount of heat generated when the battery is charged and discharged is educed, the power density, the energy density and the safety of the battery are further improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to a method for preparing graphene materials by physical processing, which belongs to the technical field of energy material graphene preparation, and specifically relates to a three-dimensional network graphene for lithium batteries and a preparation method thereof. Background technique [0002] Lithium-ion battery charge and discharge process is Li + The process of reversible intercalation and deintercalation between positive and negative materials. Li in the cathode material during charging + Break away from the positive electrode, enter the electrolyte, migrate to the negative electrode through the separator, capture electrons on the negative electrode and be reduced, and store in the layered structure material; when discharging, the lithium in the negative electrode will lose electrons and form Li + , enter the electrolyte, migrate through the separator to the positive electrode, and store in the positive electrode material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/583H01M4/587
CPCY02E60/10
Inventor 赵立平黄卫明邱淑璇
Owner XIAMEN KNANO GRAPHENE TECH CORP
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