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A kind of preparation method of graphene film for supercapacitor

A graphene film and supercapacitor technology, applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve problems such as graphene film electrode materials, unfavorable large-scale production, etc., to achieve superior supercapacitor performance and promote charge transfer. , the effect of good electrical conductivity

Inactive Publication Date: 2016-06-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the methods commonly used to prepare graphene films include chemical vapor deposition, suction filtration film formation, etc., which are not conducive to large-scale production.
[0005] At present, there is no report on the preparation of graphene thin film electrode materials by scrape coating method.

Method used

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  • A kind of preparation method of graphene film for supercapacitor
  • A kind of preparation method of graphene film for supercapacitor
  • A kind of preparation method of graphene film for supercapacitor

Examples

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Effect test

Embodiment 1

[0026] The graphite oxide prepared by the Hummer method was washed twice with deionized water without drying, and then mixed with deionized water to form a suspension, ultrasonicated for 3h, centrifuged at 3500r / min for 20min to remove the precipitate, and then the obtained graphite oxide dispersion was rotary evaporated at 40°C Until the formation of graphite oxide sol. The prepared graphite oxide sol was scraped on the surface of the titanium foil, 120μL of hydrazine hydrate was added dropwise to the inner tank of the reactor, and the scraped film was placed in the reactor, placed in an oven at 90°C for 15 hours, and washed with deionized water 3 times.

[0027] figure 1 In order to compare the X-ray diffraction patterns of graphite oxide, graphite oxide after washing, and graphene film in the process, the graphite oxide and graphite oxide after washing in the figure both show strong diffraction peaks at 2θ≈11°, but the after washing The peak intensity of graphite oxide decre...

Embodiment 2

[0033] The graphite oxide prepared by the Hummer method was washed with deionized water for 6 times without drying, and then mixed with deionized water to form a suspension, ultrasonicated for 1h, and centrifuged at 2000r / min for 40min to remove the precipitate, and then the obtained graphite oxide dispersion was rotary evaporated at 45°C Until the formation of graphite oxide sol. The prepared graphite oxide sol was scraped on the surface of the titanium foil, 40μL of hydrazine hydrate was added dropwise to the inner tank of the reactor, and the scraped film was placed in the reactor, placed in an oven at 120°C for 4 hours, and washed with deionized water 8 times. X-ray diffraction analysis showed that for the preparation of graphene films, impedance analysis showed that the contact resistance and charge transfer resistance were low, the cyclic voltammetry curve analysis had higher specific capacitance, energy density and power density, and the constant current charge and disch...

Embodiment 3

[0035] The graphite oxide prepared by the Hummer method was not dried and washed with deionized water for 4 times, then mixed with deionized water to form a suspension, ultrasonicated for 2h, 3000r / min for 30min to remove the precipitate, and then the obtained graphite oxide dispersion was rotary evaporated at 45°C Until the formation of graphite oxide sol. The prepared graphite oxide sol was scraped on the surface of the titanium foil, 80μL of hydrazine hydrate was added dropwise to the inner tank of the reactor, and the scraped film was placed in the reactor, placed in an oven at 100°C for 12 hours, and washed with deionized water 5 times. X-ray diffraction analysis showed that for the preparation of graphene films, impedance analysis showed that the contact resistance and charge transfer resistance were low, the cyclic voltammetry curve analysis had higher specific capacitance, energy density and power density, and the constant current charge and discharge analysis had bette...

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Abstract

The invention relates to a preparation method of a graphene film for a supercapacitor. The method comprises the steps of (1), washing oxidized graphite with deionized water at a room temperature, mixing with the deionized water to a suspension with a concentration of 1-5mg / ml, conducting ultrasonic for 1-3h, removing sediment in the centrifuge washing process, rotationally evaporating at 40-45 DEG C until oxidized graphite collosol is formed, and (2), placing an oxidized graphite film with a mix proportion of 1:40-120cm<2> / mL into hydrazine hydrate, reacting for 4-15h at 90-120 DEG C, and washing with the deionized water. The preparation method is simple, no conductive agent or binding agent is required, an easy-to-industrialize blade-coating film forming method is adopted, and the obtained graphene film for the supercapacitor is high in specific capacitance, good in conductivity and higher in flexibility, and has wide applications in energy storage fields such as supercapacitors and lithium ion batteries.

Description

Technical field [0001] The invention belongs to the field of preparation of graphene film materials, and particularly relates to a preparation method of a graphene film for supercapacitors. Background technique [0002] Since the discovery of graphene by the Novoselov and Geim research team of the University of Manchester in 2004, graphene has quickly become a hot topic in physics, chemistry and materials science, and has set off an upsurge in research on its properties and applications. Recently, researchers at Columbia University in the United States discovered that graphene is the strongest and thinnest material currently known in the world. In terms of conductivity, graphene is a zero band gap semiconductor. Its stable lattice structure makes carbon atoms have excellent conductivity. The speed of electrons reaches 1 / 300 of the speed of light, far exceeding the electrons in general conductors. The speed of movement is the most excellent conductive material currently known. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86
CPCY02E60/13
Inventor 李耀刚邵元龙王宏志张青红
Owner DONGHUA UNIV
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