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Graphene electrode plate and preparation method thereof

A graphene electrode, graphene technology, applied in the field of electrochemical materials, to achieve the effects of long life, increased capacity, and increased energy density

Inactive Publication Date: 2014-06-04
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The energy density of graphene as a supercapacitor has been improved to a certain extent, but compared with lithium-ion batteries, there is still a certain gap, and it is necessary to further increase the energy density of the material

Method used

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  • Graphene electrode plate and preparation method thereof
  • Graphene electrode plate and preparation method thereof
  • Graphene electrode plate and preparation method thereof

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preparation example Construction

[0028] Graphene electrode sheet preparation method provided by the invention, such as figure 1 As shown, the process steps are as follows:

[0029] 1. Preparation of gel-like electrode active materials:

[0030] According to the mass percentage, add 90~96% graphene, 2~5% conductive agent, and 2~5% binder into the solvent, stir evenly, and configure a gel-like electrode active material: among them, the electrode active material In the material, the solvent accounts for 10-30% of the total weight:

[0031] The conductive agent includes acetylene black, Ketjen black, SP conductive carbon black: the binder includes polyvinylidene fluoride, polytetrafluoroethylene, polyvinyl alcohol: the solvent includes NMP, absolute ethanol:

[0032] 2. Preparation of graphene electrode sheet samples: uniformly coat the electrode active material on the current collector, and control the coating thickness to 50-300 μm, then put it into an oven and dry it at 80-100 ° C for 6-12 hours to obtain G...

Embodiment 1

[0039] 1. Preparation of gel-like electrode active materials:

[0040] According to the mass percentage, add 90% graphene, 5% acetylene black, and 5% polyvinylidene fluoride (PVDP) into the NMP solvent, stir evenly, and configure a gel-like electrode active material: among them, the electrode active material Among them, the solvent accounts for 30% of the total weight:

[0041] 2. Prepare graphene electrode sheet samples: Coat the electrode active material evenly on the aluminum foil, and control the coating thickness to 50 μm, then put it in an oven and dry it at 80°C for 12 hours to obtain graphene electrode sheet samples:

[0042] 3. Electrochemical oxidation treatment: Electrochemical oxidation is carried out using a three-electrode system. The obtained graphene electrode sheet sample is used as the working electrode, the platinum sheet is used as the auxiliary electrode, and the silver / silver chloride electrode is used as the reference electrode. The three electrodes are ...

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Abstract

The invention pertains to the field of electrochemistry materials, and discloses a grapheme electrode plate and a preparation method thereof. The grapheme electrode plate comprises a current collector and an electrode active material coating the surface of the current collector. The electrode active material comprises, by mass, 90-96% of graphene, 2-5% of conductive agent, and 2-5% of binder. According to the graphene electrode plate provided in the invention, a oxygen-containing functional group is formed on the surface of the grapheme, so when the grapheme electrode plate is used in a supercapacitor electrode, the oxygen-containing functional group and ions in an electrolyte can be subjected to Faraday redox reaction to increase the pseudocapacitance, so the graphene electrode plate has both of the electrical double-layer capacitance and the pseudocapacitance, so that the supercapacitor capacity can be improved.

Description

technical field [0001] The invention relates to the field of electrochemical materials, in particular to a graphene electrode sheet and a preparation method thereof. Background technique [0002] Andre K. Geim (Andre K.Geim) of the University of Manchester in the United Kingdom prepared graphene materials in 2004, and it has received widespread attention due to its unique structure and photoelectric properties. Single-layer graphite is considered an ideal material due to its 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, (5,000W / mK): 3, high conductivity, carrier transport rate, ( 200,000cm2 / V*s): 4, high specific surface area, (theoretical calculation value: 2,630m2 / g). In particular, its high conductivity, large specific surface properties and its two-dimensional nanoscale structural pr...

Claims

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Application Information

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IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 周明杰钟玲珑王要兵吴凤
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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