Preparation method of graphene film for supercapacitor

A graphene film and supercapacitor technology, which is applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problems that graphene film electrode materials have not yet been seen, and are unfavorable for large-scale production, so as to achieve superior supercapacitor performance and promote charge transmission. , The effect of simple preparation process

Inactive Publication Date: 2013-03-20
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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  • Preparation method of graphene film for supercapacitor
  • Preparation method of graphene film for supercapacitor
  • Preparation method of graphene film for supercapacitor

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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 made into a suspension with deionized water, ultrasonicated for 3 hours, centrifuged at 3500r / min for 20 minutes to remove the precipitate, and then the obtained graphite oxide dispersion was rotary evaporated at 40°C Until the formation of graphite oxide sol. Scrape-coat the prepared graphite oxide sol on the surface of titanium foil, add 120 μL of hydrazine hydrate dropwise into the inner tank of the reaction kettle, place the scrap-coated film in the reaction kettle, place it in an oven at 90°C for 15 hours, and wash it with deionized water 3 times.

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

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 make a suspension, ultrasonicated for 1 hour, and centrifuged at 2000r / min for 40 minutes to remove the precipitate, and then the obtained graphite oxide dispersion was rotary evaporated at 45°C Until the formation of graphite oxide sol. Scrape-coat the prepared graphite oxide sol on the surface of titanium foil, add 40 μL of hydrazine hydrate dropwise into the inner tank of the reaction kettle, place the scrap-coated film in the reaction kettle, and place it in an oven at 120°C for 4 hours, then wash with deionized water 8 times. X-ray diffraction analysis shows that in order to prepare graphene film, impedance analysis shows that contact resistance and charge transfer resistance are low, cyclic voltammetry curve analysis has higher specific capacitance, energy density and power density, and constant current charge and disc...

Embodiment 3

[0035] The graphite oxide prepared by the Hummer method was washed 4 times with deionized water without drying, and then mixed with deionized water to make a suspension, ultrasonicated for 2 hours, and centrifuged at 3000r / min for 30 minutes to remove the precipitate, and then the obtained graphite oxide dispersion was rotary evaporated at 45°C Until the formation of graphite oxide sol. Scrape-coat the prepared graphite oxide sol on the surface of titanium foil, add 80 μL of hydrazine hydrate dropwise into the inner tank of the reaction kettle, place the scrap-coated film in the reaction kettle, put it in an oven at 100°C for 12 hours, and wash it with deionized water 5 times. X-ray diffraction analysis shows that in order to prepare graphene film, impedance analysis shows that contact resistance and charge transfer resistance are low, cyclic voltammetry curve analysis has higher specific capacitance, energy density and power density, and constant current charge and discharge ...

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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, in particular to a preparation method of graphene film for supercapacitors. Background technique [0002] Since the discovery of graphene by the research team of Novoselov and Geim at the University of Manchester in 2004, graphene has rapidly become a hot topic in physics, chemistry and materials science, setting off an upsurge of researchers studying its properties and applications. Recently, researchers at Columbia University in the United States discovered that graphene is the strongest and thinnest material among known materials in the world. In terms of conductivity, graphene is a zero-bandgap semiconductor, and its stable lattice structure makes carbon atoms have excellent conductivity, in which the movement speed of electrons reaches 1 / 300 of the speed of light, far exceeding that of electrons in general conductors. It is the material with the best electrical conducti...

Claims

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Application Information

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Patent Type & Authority Applications(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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