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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 limited by many aspects

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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

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

[0037] Take chloride-intercalated graphite, add it into the molten ionic liquid according to the ratio of solid-liquid ratio of 1g: 10-100mL, and ultrasonically strip it for 0.5-24 hours to obtain a mixture of graphene, ionic liquid and chloride;

[0038] Place the mixed solution in an environment with an electric field strength of 100-1000 V / m and a vertical direction of the electric field, centrifuge at a speed of 1000-5000 r / min for 1-10 minutes, remove the supernatant, and obtain graphene ;

[0039] The graphene is immersed in the ionic liquid again for 10 to 24 hours, filtered to remove the ionic liquid, and the filtrate is dried to obtain a graphene / ionic liquid composite material.

[0040] The graphite is natural phosphorus flake graphite or artificial graphite.

[0041] The chloride intercalation agent is at least one of ferric chloride, nickel chloride, copper chloride, cobalt chl...

Embodiment 1

[0061] A kind of preparation method of graphene / ionic liquid composite material, comprises the following steps:

[0062] (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;

[0063] (2) Select 1-ethyl-3-methylimidazolium bromide (EtMeImBr) as the ionic liquid, melt it in a beaker to obtain 1L of EtMeImBr solvent, maintain the temperature of EtMeImBr solvent at 150°C, add 100g of the above pure Ferric chloride intercalated graphite, after stirring evenly, put the beaker into an ultrasonic instrument with a pow...

Embodiment 2

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

[0074] (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;

[0075] (2) Select 1-ethyl-3-methylimidazolium chloride salt (EtMeImCl) as the ionic liquid, melt it in a beaker to obtain 10L of EtMeImCl solvent, maintain the temperature of EtMeImCl solvent at 180°C, add 100g of the above pure Copper chloride intercalated graphite, after stirring evenly, put the beaker into a 500W ultrasonic instrument, k...

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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, ultrasonic stripping is performed for 0.5-24 hours and then the obtained mixed liquor is placed in a constant electric field to be centrifuged, and supernatant is removed so that graphene is obtained; and the graphene is immersed into the ionic liquid again, the ionic liquid is removed via filtering 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, 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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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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