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Preparation method for graphene-carbon nanofiber composite current collectors

A nano-carbon fiber and graphene technology, applied in capacitors, electrical components, electrolytic capacitors, etc., can solve the problem of low tensile strength of graphene, achieve good tensile strength and improve mechanical strength

Inactive Publication Date: 2013-12-18
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the tensile strength of graphene prepared by the redox method is low, so that the graphene film cannot be made too thin when used as a current collector.

Method used

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  • Preparation method for graphene-carbon nanofiber composite current collectors
  • Preparation method for graphene-carbon nanofiber composite current collectors

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preparation example Construction

[0024] Such as figure 1 The preparation method of the graphene-carbon nanofiber composite current collector of one embodiment shown, comprises the steps:

[0025] S10. Add graphite oxide and carbon nanofibers into the solvent according to the mass ratio of 1:1 to 2:1, and ultrasonically disperse to obtain a composite suspension of graphene oxide-carbon nanofibers.

[0026] The solvent can be ionized water, ethanol, isopropanol, propanol, N-methylpyrrolidone (NMP) or N,N-dimethylformamide (DMF).

[0027] The time for ultrasonic dispersion can be 1h~2h, subject to obtaining the graphene oxide suspension.

[0028] The total concentration of the obtained graphene oxide-carbon nanofiber composite suspension can be 0.1 mg / ml-5 mg / ml.

[0029] S20, adding a hydrazine hydrate solution to the graphene oxide-carbon nanofiber composite suspension obtained in S10, and reacting after mixing to obtain a graphene-carbon nanofiber composite suspension.

[0030] Hydrazine hydrate generally ...

Embodiment 1

[0042] Graphite oxide and carbon nanofibers were added into deionized water at a ratio of 1:1, and ultrasonically dispersed for 1 h to obtain a graphene oxide-carbon nanofiber composite suspension with a concentration of 0.1 mg / ml.

[0043] Add a hydrazine hydrate solution with a mass fraction of 85% to the obtained graphene oxide-carbon nanofiber composite suspension (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-carbon nanofiber composite suspension.

[0044] Vacuum filter the graphene-carbon nanofiber composite suspension through a microporous filter membrane to obtain a filter cake, place the filter cake in an oven to dry at 40°C, then peel off the graphene-carbon nanofiber composite film from the filter membrane, and remove the graphite Put the alkene-carbon nanofiber composite film into a tube furnace, pass in argon gas to discharge the air in the furnace, then control the flow rate ...

Embodiment 2

[0046] Graphite oxide and carbon nanofibers were added to ethanol at a ratio of 2:1, and ultrasonically dispersed for 1.5 h to obtain a graphene oxide-carbon nanofiber composite suspension with a concentration of 1 mg / ml.

[0047] Add a hydrazine hydrate solution with a mass fraction of 85% (the mass ratio of hydrazine hydrate and graphene oxide is 4:10) to the obtained graphene oxide-carbon nanofiber composite suspension, and react at a temperature of 90°C for 18 hours to obtain graphite ene-carbon nanofiber composite suspension.

[0048] Vacuum filter the graphene-carbon nanofiber composite suspension through a microporous filter membrane to obtain a filter cake, place the filter cake in an oven to dry at 40°C, then peel off the graphene-carbon nanofiber composite film from the filter membrane, and remove the graphene - Put the nano-carbon fiber composite film into the tube furnace, pass in argon to discharge the air in the furnace, then control the flow of argon to 70ml / min...

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Abstract

The invention discloses a preparation method for graphene-carbon nanofiber composite current collectors. The preparation method includes the flowing steps: adding graphite oxide and carbon nanofibers into solvent to obtain graphene oxide-carbon nanofiber composite suspension liquid through ultrasonic dispersion, adding a hydrazine hydrate solution to obtain graphene-carbon nanofiber composite suspension liquid through reaction, performing vacuum filtration on the graphene-carbon nanofiber composite suspension liquid by a millipore filter membrane, drying filter cakes, and performing heat treatment on the fliter cakes in a reducing atmosphere at the temperature of 500 DEG C to 1000 DEG C after stripping the filter cakes from the filter membrane to obtain the graphene-carbon nanofiber composite current collectors. The carbon nanofibers are added into the graphene oxide suspension liquid, so that mechanical strength of the graphene-carbon nanofiber composite current collectors is improved. Compared with conventional preparation methods for the graphene current collectors, the preparation method has the advantage of capability of preparing the graphene-carbon nanofiber composite current collectors with good tensile strength.

Description

technical field [0001] The invention relates to a preparation method of a graphene-nano carbon fiber 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...

Claims

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Application Information

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IPC IPC(8): H01G9/00H01G9/004
Inventor 周明杰吴凤王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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