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Graphene/ionic liquid composite material and preparation method thereof, graphene/ionic liquid combined electrode 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 of electrochemical capacitors, the decrease of the specific gravity of active materials, and the small specific capacity and conductivity, so as to avoid internal resistance and activity The effect of the reduction of material specific gravity, high production efficiency and high monolayer rate

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, graphene/ionic liquid combined electrode and electrochemical capacitor

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preparation example Construction

[0036] A preparation method of graphene / ionic liquid composite material, comprising:

[0037] Take chloride-intercalated graphite, add it to the molten ionic liquid according to the ratio of solid-to-liquid ratio of 1g:10~100mL, and peel it off in an alternating electric field to obtain a mixed solution of chloride, graphene and ionic liquid;

[0038] centrifuging the mixed solution at a speed of 1000-5000 r / min for 1-10 minutes, removing the supernatant to obtain graphene;

[0039] The graphene is immersed in the ionic liquid again for 10 to 30 minutes, filtered to remove the ionic liquid, and the filtrate is dried to obtain a graphene / ionic liquid composite material.

[0040] 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 treatment at 460-550°C for 2-6 hours, and react After cooling to room temperature, chloride intercalated graphite was ...

Embodiment 1

[0062] A preparation method of graphene / ionic liquid composite material, comprising the following steps:

[0063] (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;

[0064] (2) Use 1-ethyl-3-methylimidazolium bromide (EtMeImBr) as the ionic liquid, dissolve it in a beaker at a high temperature of 150°C to obtain 1L of EtMeImBr solvent, add the ferric chloride prepared in step (1) Intercalation graphite 100g, stir to obtain the mixed solution of graphite, ionic liquid and ferric chloride; Get 1L of above-men...

Embodiment 2

[0074] A preparation method of graphene / ionic liquid composite material, comprising the following steps:

[0075] (1) Mix artificial graphite and copper chloride according to the mass ratio of 1:0.9, mix them evenly, put them into a quartz tank, seal the quartz tank, put the quartz tank into a high-temperature furnace, raise the temperature to 500°C, and keep warm for 3 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 90°C for 5 hours to obtain pure copper chloride intercalated graphite;

[0076] (2) Use 1-ethyl-3-methylimidazolium chloride salt (EtMeImCl) as the ionic liquid, dissolve it in a beaker at a high temperature of 180°C to obtain 10L of EtMeImCl solvent, add the copper chloride prepared in step (1) Intercalation graphite 100g, stir to obtain the mixed solution of graphite, ionic liquid and cupric chloride; Get 1L above-me...

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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, stripping is performed under the effect of an alternating electric field, the obtained mixed liquor is 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 manufactured by the composite material and the preparation method thereof and an electrochemical capacitor manufactured 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, source of raw materials is wide, 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 and a preparation method thereof, a graphene / ionic liquid composite electrode and an electrochemical capacitor. Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. It was first discovered in 2004 by Andre K. Geim of the University of Manchester in the United Kingdom. Graphene materials have attracted widespread attention at home and abroad for their good light transmission, electrical conductivity and extremely high mechanical strength. 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, since the current method for p...

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钟辉
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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