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Method for manufacturing graphene composite electrode

A graphene composite, graphene technology, applied in battery electrodes, capacitor electrodes, circuits, etc., can solve the problems of reducing the power density of supercapacitors, increasing the equivalent series resistance of electrodes, and complex electrode sheet processes, and achieving increased cycle stability. performance, reducing the equivalent series resistance, and easy and feasible operation

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

However, like other conductive polymers, it is inevitable that the skeleton structure is easily damaged and the capacity decay is very obvious.
[0004] Usually supercapacitors have positive and negative electrodes. The traditional process of preparing electrode sheets is relatively complicated, and a certain amount of binder is added to increase the equivalent series resistance of the electrodes. Theoretically, the maximum power density of a supercapacitor is represented by P max =V 2 / 4R means, where V is the voltage of the supercapacitor and R is the equivalent series resistance of the supercapacitor, which reduces the power density of the supercapacitor

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  • Method for manufacturing graphene composite electrode

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[0014] The embodiment of the present invention provides a kind of preparation method of graphene composite electrode, such as figure 1 As shown, it includes the following steps:

[0015] S01: Provide poly(3,4-ethylenedioxythiophene): polystyrene sulfonate aqueous solution, aqueous dispersion containing graphene and cationic surfactant;

[0016] S02: immersing the current collector in an aqueous polyethyleneimine solution to obtain a surface charge treated current collector;

[0017] S03: Immerse the current collector of the surface charge treatment into the poly(3,4-ethylenedioxythiophene): polystyrene sulfonate aqueous solution, and then immerse the graphene-containing and cationic surface active In the aqueous dispersion of agent, then repeatedly immersed in said poly(3,4-ethylenedioxythiophene): polystyrene sulfonate aqueous solution and the aqueous dispersion containing graphene and cationic surfactant Step, obtain graphene polymer modified electrode;

[0018] S04: dryi...

Embodiment 1

[0028] Preparation of PEDOT:PSS aqueous solution: Dissolve PSS in a certain amount of deionized water to prepare a solution with a concentration of 0.1 mg / mL, add EDOT dropwise to it (the molar ratio of PSS to EDOT monomer is 1:1), slowly Stir for 5 minutes, add dropwise hydrochloric acid, control the pH of the system to be 2, then slowly add ammonium persulfate [(NH4) 2 S 2 o 8 ] solution, its molar ratio with EDOT is 1:1, rapid stirring reaction 12h, obtains the PEDOT / PSS solution of 0.1mg / mL.

[0029] Preparation of graphene and cationic surfactant-containing aqueous dispersions: graphene and dodecyltrimethylammonium chloride are added to distilled water at a mass ratio of 1:1 for ultrasonic dispersion for 1 h, forming a graphene concentration of 0.1 mg / mL graphene and quaternary ammonium salt in water.

[0030] Place the 6μm copper foil in acetone, ethanol, and secondary water for 20 minutes for ultrasonic treatment. After the treatment is clean, rinse with a large amou...

Embodiment 2

[0034]Preparation of PEDOT:PSS aqueous solution: Dissolve PSS in a certain amount of deionized water to prepare a solution with a concentration of 5 mg / mL, add EDOT dropwise to it (the molar ratio of PSS to EDOT is 2:1), and stir slowly for 10 minutes , drop hydrochloric acid, control the pH of the system to be 3, then slowly add ammonium persulfate [(NH4) 2 S 2 o 8 ] solution, its molar ratio with EDOT is 2:1, rapid stirring reaction 12h, obtains the PEDOT / PSS solution of 5mg / mL.

[0035] Preparation of graphene and cationic surfactant-containing aqueous dispersion: graphene and triethanolammonium were added to distilled water at a mass ratio of 1:1 for ultrasonic dispersion for 5 hours to form graphene and triethanolammonium with a graphene concentration of 5 mg / mL. Aqueous solution of ethanolammonium.

[0036] Place the 20μm aluminum foil in acetone, ethanol, and secondary water for 30 minutes, and then wash it with a large amount of secondary water, dry it with nitrogen...

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Abstract

The invention relates to the technical field of graphene, and provides a method for manufacturing a graphene composite electrode. The method includes steps of respectively providing poly(3,4-ethylenedioxythiophene), polystyrene sulfonate aqueous solution and aqueous solution dispersion containing graphene and cationic surfactants; immersing current collectors into polyethylenimine aqueous solution to obtain current collectors with surfaces which are subjected to charge processing; immersing the current collectors with the surfaces which are subjected to charge processing into the poly(3,4-ethylenedioxythiophene), the polystyrene sulfonate aqueous solution and aqueous solution dispersion containing the graphene and the cationic surfactants, and then sequentially immersing the current collectors into the poly(3,4-ethylenedioxythiophene), the polystyrene sulfonate aqueous solution and aqueous solution dispersion containing the graphene and the cationic surfactants again to obtain a graphene polymer modified electrode; drying the graphene polymer modified electrode under the vacuum condition at the temperature ranging from 100 DEG C to 180 DEG C to obtain the graphene composite electrode. The method has the advantages that a technology for manufacturing the graphene composite electrode is simple, operation is simple and feasible, and the graphene composite electrode can be easily manufactured on a large scale.

Description

technical field [0001] The invention belongs to the technical field of energy storage devices, and in particular relates to a preparation method of a graphene composite electrode. Background technique [0002] Since Andre K. Geim (Andre K. Geim) of the University of Manchester in the United Kingdom prepared graphene materials in 2004, due to its unique structure and photoelectric properties, it has received widespread attention. Graphene is hailed as a rising "new star" in the field of materials science and condensed matter physics. Its many novel and unique properties and potential applications have attracted many scientific and technological workers. Single-layer graphene has a large specific surface area, excellent electrical and thermal conductivity and low thermal expansion coefficient, such as: 1. High strength, Young's molar weight, (1,100GPa), breaking strength: (125GPa); 2. High thermal conductivity rate, (5,000W / mK); 3. High conductivity, carrier transport rate, (...

Claims

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Application Information

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IPC IPC(8): H01G9/04H01M4/1393
CPCY02E60/10
Inventor 周明杰吴凤王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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