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Graphene-ionic liquid composite material and preparation method thereof, graphene-ionic liquid composite electrode and preparation method thereof, and electrochemical capacitor

A technology of ionic liquid and composite materials, which is applied in the field of graphene material synthesis, can solve the problems of restricting the energy density and power density, small specific capacity and electrical conductivity of electrochemical capacitors, and the decrease of the specific gravity of active materials, so as to achieve fast charge and discharge performance, High single-layer ratio, avoiding the effect of increasing the internal resistance of the electrode

Inactive Publication Date: 2014-08-27
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the above-mentioned technical defects of graphene, the specific capacity and conductivity of graphene electrode materials are small at present, and a binder needs to be added during the preparation process, which not only increases the internal resistance of the electrode, but also leads to the deterioration of the active material. The decrease in specific gravity seriously restricts the energy density and power density of electrochemical capacitors, so the application of graphene materials in electrochemical capacitors is restricted in many ways

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  • Graphene-ionic liquid composite material and preparation method thereof, graphene-ionic liquid composite electrode and preparation method thereof, and electrochemical capacitor

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preparation example Construction

[0035] A method for preparing a graphene-ionic liquid composite material, comprising: mixing intercalated graphite and molten ionic liquid at a ratio of 1 g to 100 mL of solid-to-liquid ratio, stirring evenly and putting it into a microwave oven, and heating it at 1000 to 2000 W The power is peeled off for 10 to 100 minutes to obtain a graphene-ionic liquid composite material.

[0036]Graphite is a multilayer crystal structure with good stability. Although the bonding force between graphite layers is weak, it is almost impossible to completely peel off graphite crystal layers directly under the current technical conditions. The graphite is placed in the intercalation agent for electrolysis, and the ions in the electrolyte can enter the graphite layer, causing the expansion of the graphite interlayer distance, further weakening the bonding force between the graphite layers, and making an intercalated graphite that is easy to peel off. The intercalated graphite is prepared by th...

Embodiment 1

[0064] A kind of preparation method of graphene-ionic liquid composite material, comprises the steps:

[0065] (1) Use stainless steel sheet as the current collector, first take about 2g of natural phosphorus flake graphite and press it into a graphite sheet of 75mm×40mm×7mm as the working electrode, and use the lead plate as the counter electrode, Hg / Hg 2 SO 4 As a reference electrode; first pour formic acid into the electrolytic cell as the electrolyte, then place the reference electrode, working electrode and counter electrode in the electrolytic cell and completely soak in the electrolyte, at room temperature at 5mA / cm 2 The current density of the electrolysis reaction was 20 hours; after the electrolysis, the graphite flakes were taken out, and the volume of the graphite flakes could be seen to expand. Rinse the obtained graphite flakes twice with deionized water, then put them into a vacuum drying oven, and dry them at 60°C for 24 hours. , to obtain pure intercalated gr...

Embodiment 2

[0073] A kind of preparation method of graphene-ionic liquid composite material, comprises the steps:

[0074] (1) Use stainless steel sheet as the current collector, first take about 2g of artificial graphite and press it into a graphite sheet of 75mm×40mm×7mm as the working electrode, and use the lead plate as the counter electrode, Hg / Hg 2 SO 4 As a reference electrode; first pour acetic acid into the electrolytic cell as the electrolyte, then place the reference electrode, working electrode and counter electrode in the electrolytic cell and completely soak in the electrolyte, at room temperature at 20mA / cm 2 The current density of the electrolysis reaction was 1 hour; after the electrolysis, the graphite flakes were taken out, and the volume expansion of the graphite flakes could be seen, and the obtained graphite flakes were rinsed with deionized water for 3 times, then put into a vacuum drying oven, and dried at 70°C for 20 hours , to obtain pure intercalated graphite. ...

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Abstract

The invention discloses a preparation method of a graphene-ionic liquid composite material. The preparation method comprises mixing intercalated graphite with a molten ionic liquid in a solid-liquid ratio of 1g:10-100mL, stirring the mixture uniformly, and then putting the mixture into a microwave oven for stripping for 10 to 100 minutes with power being 1,000 to 2,000w, and obtaining the graphene-ionic liquid composite material. The invention further discloses the graphene-ionic liquid composite material made by using the preparation method, a graphene-ionic liquid composite electrode including the graphene-ionic liquid composite material, a preparation method of the graphene-ionic liquid composite electrode, and an electrochemical capacitor. The graphene-ionic liquid composite material which is intact in laminated structure, high in single layer rate and good in dispersibility is made by placing the intercalated graphite into the ionic liquid for microwave stripping. The prepared composite electrode does not need to use an adhesive or to prepare a current collector, and therefore the internal resistance of the electrode and the contact resistance are reduced, and the power density and energy density of the electrochemical capacitor are improved.

Description

technical field [0001] The invention relates to the field of graphene material synthesis, in particular to a graphene-ionic liquid composite material and a preparation method thereof, a graphene-ionic liquid composite electrode and a preparation method thereof, and an electrochemical capacitor. Background technique [0002] Graphene is a two-dimensional carbon atom crystal discovered by Andre K. Geim of the University of Manchester in 2004, and won the 2010 Nobel Prize in Physics. Due to its unique structure and good photoelectric properties, graphene has become one of the research hotspots in the fields of carbon materials, nanotechnology and functional materials. At present, the method for preparing graphene materials is mainly the oxidation-reduction method, but in the preparation process, due to the use of strong acid or alkali, the sheet structure of graphene is easily destroyed, and the graphene is prone to agglomeration, which is seriously serious. Affected its elect...

Claims

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Application Information

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IPC IPC(8): H01G11/38H01G11/86
CPCY02E60/13
Inventor 周明杰王要兵袁新生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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