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

A technology of ionic liquids 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 conductivity of electrochemical capacitors, and the decrease of the specific gravity of active materials, so as to avoid internal resistance and activity Effects of reduction in material specific gravity, high monolayer ratio, and high production efficiency

Inactive Publication Date: 2014-05-14
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, combined electrode and preparation method thereof and electrochemical capacitor

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preparation example Construction

[0035] A preparation method of graphene-ionic liquid composite material, comprising:

[0036] Take chloride intercalated graphite, add it into the molten ionic liquid according to the ratio of solid-liquid ratio 1g:10~100mL, stir evenly to obtain a mixed solution of chloride intercalated graphite and ionic liquid;

[0037] Place the mixed solution in a constant parallel magnetic field with a magnetic field strength of 0.01-1T and a vertically upward or vertically downward direction, then centrifuge at a speed of 1000-10000r / min for 10-30 minutes, and remove the supernatant , to obtain graphene;

[0038] Immersing the graphene in the ionic liquid again for 10-30 minutes, filtering to remove the ionic liquid, and drying the filtrate to obtain a graphene-ionic liquid composite material.

[0039] The chloride intercalation graphite is prepared by the following steps: mix graphite and chloride intercalation agent at a mass ratio of 1:0.8-1.2, place in a closed container for heat t...

Embodiment 1

[0060] A kind of preparation method of graphene-ionic liquid composite material, comprises the steps:

[0061] (1) Mix natural graphite and ferric chloride according to the mass ratio of 1:0.8, mix them evenly and put them into a quartz tube, seal the quartz tube and put the quartz tube into a high-temperature furnace, raise the temperature to 460°C, and keep warm for 2 Hours, after the reaction is finished, cool to room temperature, pour the reactant into deionized water and rinse once, then filter the filter residue and put it in a vacuum drying oven to dry at 80°C for 6 hours to obtain pure ferric chloride intercalated graphite;

[0062] (2) Select 1-ethyl-3-methylimidazolium bromide (EtMeImBr) as the ionic liquid, melt it in a beaker at a high temperature of 150°C to obtain 1L of EtMeImBr solvent, keep the temperature of the EtMeImBr solvent constant, and add the step (1) 100 g of the prepared ferric chloride intercalated graphite was stirred evenly to obtain a mixed solut...

Embodiment 2

[0072] A kind of preparation method of graphene-ionic liquid composite material, comprises the steps:

[0073] (1) Mix artificial graphite and copper chloride according to the mass ratio of 1:0.9, mix them evenly, put them into a quartz tube, seal the quartz tube, put the quartz tube into a high-temperature furnace, heat up to 500°C, and keep warm for 3 Hours, after the reaction was finished, cool to room temperature, pour the reactant into deionized water and rinse twice, then filter the filter residue and put it in a vacuum drying oven at 90°C for 5 hours to dry to obtain pure copper chloride intercalated graphite;

[0074] (2) Select 1-ethyl-3-methylimidazolium chloride salt (EtMeImCl) as the ionic liquid, melt it in a beaker at a high temperature of 180°C to obtain 10L of EtMeImCl solvent, keep the temperature of the EtMeImCl solvent constant, and add the step (1) 100 g of prepared copper chloride intercalated graphite was stirred evenly to obtain a mixed solution of coppe...

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Abstract

The invention discloses a preparation method of a graphene-ionic liquid composite material. The method comprises that: chloride intercalation graphite is taken to be added into the fused ionic liquid, the obtained mixed liquor after even stirring is placed in a constant parallel magnetic field to be centrifuged and supernatant is removed so that graphene is obtained; and the graphene is immersed into the ionic liquid again, filtering is performed and the filtered material is dried so that the graphene-ionic liquid composite material is obtained. The invention also discloses the graphene-ionic liquid composite material prepared via the aforementioned preparation method, a graphene-ionic liquid combined electrode prepared by the composite material and the preparation method thereof and an electrochemical capacitor prepared by the combined electrode. Defects of liable agglomeration and small specific area when the existing graphene acts as an electrode material independently can be overcome. Under the premise of not destroying the structure of the graphene, the graphene-ionic liquid composite material with high single-layer rate and great dispersity can be prepared so that preparation efficiency is high, cost is low and industrialization is easy to realize.

Description

technical field [0001] The invention relates to the field of graphene material synthesis, in particular to a graphene-ionic liquid composite material, a graphene-ionic liquid composite electrode, a preparation method thereof, and an electrochemical capacitor. Background technique [0002] Graphene is a two-dimensional sheet with carbon atoms arranged in a hexagonal ring. It was first discovered in 2004 by Andre K. Geim of the University of Manchester in the United Kingdom. Graphene material has its unique structure and good photoelectric properties, making it a research hotspot in the fields of carbon materials, nanotechnology, condensed matter physics and functional materials. Single-layer graphene has better electrical and thermal conductivity and low thermal expansion coefficient, and its theoretical specific surface area is as high as 2630m 2 / g (A Peigney, Ch Laurent, et al. Carbon, 2001, 39, 507), considered to be one of the most ideal electrode materials. However, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042H01G9/045
CPCY02E60/13
Inventor 周明杰袁新生王要兵刘大喜
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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