Preparation method of graphene composite current collector

A graphene composite and current collector technology, applied in capacitor parts and other directions, can solve problems such as large specific surface area, easy agglomeration, integrity of graphene current collectors, and film-forming effects.

Inactive Publication Date: 2013-12-18
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
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Problems solved by technology

However, due to the large specific surface area of ​​graphene, it is easy to agglomerate, which affects the properties of the prepar

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  • Preparation method of graphene composite current collector

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preparation example Construction

[0027] Such as figure 1 The preparation method of the graphene composite current collector of one embodiment shown, comprises the steps:

[0028] S10, adding graphite oxide into the solvent, and ultrasonically dispersing to obtain a graphene oxide suspension.

[0029] The time for ultrasonic dispersion can be 1h~2h, subject to obtaining the graphene oxide suspension.

[0030] The concentration of the obtained graphene oxide suspension can be 0.1 mg / ml-5 mg / ml.

[0031] The solvent can be one of ethanol, isopropanol, propanol or carbon tetrachloride.

[0032] S20, adding a conductive polymer monomer to the graphene oxide suspension obtained in S10, and obtaining a graphene oxide / conductive polymer composite suspension after in-situ polymerization.

[0033] The conductive polymer monomer can be pyrrole monomer, aniline monomer or thiophene monomer.

[0034] The mass ratio of graphene oxide and conductive polymer monomer can be 1:1~5:1.

[0035] In situ polymerization to obt...

Embodiment 1

[0052] Add graphite oxide into the ethanol solution for ultrasonic dispersion for 1 hour to obtain a 0.1mg / ml graphene oxide suspension, then add analytically pure pyrrole monomer (the mass ratio of pyrrole monomer to graphene oxide is 1:2), continue Sonicate for 10 min to form a stable suspension. At 0°C, slowly dropwise add an aqueous solution of ferric chloride with a concentration of 0.5 mol / L (the molar ratio of ferric chloride to pyrrole monomer is 1:1) to the stable suspension above, and stir for 4 hours to make pyrrole single A polymerization reaction occurs in the body to obtain a graphene oxide / polypyrrole composite suspension.

[0053] To the obtained graphene oxide / polypyrrole composite suspension, add a hydrazine hydrate solution with a mass fraction of 85% (the mass ratio of hydrazine hydrate and graphene oxide is 1:10), and react at a temperature of 100°C for 12 hours to obtain graphite ene / polypyrrole composite suspension.

[0054] The graphene / polypyrrole co...

Embodiment 2

[0058] Add graphite oxide into the isopropanol solution for ultrasonic dispersion for 2 hours to obtain a 1 mg / ml graphene oxide suspension, then add analytically pure aniline monomer (the mass ratio of aniline monomer to graphene oxide is 1:1), Continue to sonicate for 20 minutes to form a stable suspension. Add ammonium persulfate and an alcoholic solution of concentrated hydrochloric acid with a mass fraction of 37% to the stable suspension at -5°C sequentially (the molar ratio of ammonium persulfate to aniline monomer is 1 : 1), stirring for 12 hours, so that the aniline monomer undergoes a polymerization reaction to obtain a graphene oxide / polyaniline composite suspension.

[0059] To the obtained graphene oxide / polyaniline composite suspension, add a hydrazine hydrate solution with a mass fraction of 85% (the mass ratio of hydrazine hydrate and graphene oxide is 4:10), and react at a temperature of 80°C for 24 hours to obtain graphite olefin / polyaniline composite suspens...

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Abstract

The invention discloses a preparation method of a graphene composite current collector. The preparation method comprises the following steps of preparing a graphene oxide suspension liquid, adding a conductive polymer monomer into the graphene oxide suspension liquid for in-situ polymerization to obtain a graphene oxide/conductive polymer composite suspension liquid, adding a hydrazine hydrate solution into the graphene oxide/conductive polymer composite suspension liquid for a reaction to obtain a graphene/conductive polymer composite suspension liquid, carrying out vacuum filtration of the graphene/conductive polymer composite suspension liquid by a microporous membrane, drying the filter cake, and separating the filter cake from the microporous membrane to obtain the graphene composite current collector. According to the preparation method, the conductive polymer monomer is added into the graphene oxide suspension liquid so that a conductive polymer is formed, and the conductive polymer can be dispersed between graphene sheets well so that graphene aggregation is prevented and the graphene mixed suspension liquid having good dispersity is obtained. Compared with the traditional graphene current collector preparation method, the preparation method can realize preparation of the graphene composite current collector having good integrity and good film-forming properties.

Description

technical field [0001] The invention relates to a preparation method of a graphene composite current collector. Background technique [0002] Supercapacitor is a new type of energy storage device, which has the advantages of high power density (more than 10 times that of ordinary batteries), high cycle life (the number of cycles can reach more than 100,000 times), and good fast charge and discharge performance. It is widely used in Military fields, mobile communication devices, computers, and hybrid power sources for electric vehicles, etc. Generally, a supercapacitor is mainly assembled by an electrode active material layer, an electrolyte, a separator, a current collector, and a casing. The energy density of existing supercapacitors is generally relatively low. The main factors affecting the energy density of supercapacitors are the capacitance of the electrode material, the voltage of the system, and the proportion of the electrode material to the total weight of the ele...

Claims

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Application Information

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IPC IPC(8): C08G73/06C08G73/02C08G75/00C08K9/00C08K3/04H01G9/004
Inventor 周明杰吴凤王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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