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

An ionic liquid and composite electrode technology, applied in the field of electrochemical power supply, can solve problems such as restricting the energy density and power density of electrochemical capacitors, complicated graphene electrode preparation process, and decreasing active material proportion, etc., and achieves fast charge-discharge performance, Low cost and low electrode internal resistance

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

The addition of conductive agents, binders, and current collectors (ie, metal foils) not only increases the internal resistance of the electrodes, but also leads to a decrease in the specific gravity of the active material, which severely restricts the energy density and power density of the electrochemical capacitor. It also complicates the preparation process of graphene electrodes, which limits its application in electrochemical capacitors in many aspects.

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

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preparation example Construction

[0027] A preparation method of graphene-ionic liquid composite electrode, comprising:

[0028] Take chloride-intercalated graphite, add it to the molten ionic liquid according to the ratio of solid-liquid ratio of 1g: 10-100mL, and ultrasonically exfoliate it with a power of 400-800W for 0.5-24 hours to obtain graphene, ionic liquid and chloride. mixed solution;

[0029] The mixed solution is placed in an environment with an electric field strength of 100-1000 V / m and a vertical direction of the electric field, and after centrifugation for 1-10 minutes, the supernatant is removed to obtain a graphene-ionic liquid composite material;

[0030] The obtained graphene-ionic liquid composite material is placed in a forming mold, and then a pressure of 10-30 MPa is applied to the mold cover, cooled to room temperature, and solidified to obtain a graphene-ionic liquid composite electrode.

[0031] The chloride intercalation graphite is prepared by the following steps: mix graphite an...

Embodiment 1

[0049] A preparation method for a graphene-ionic liquid composite electrode, comprising the steps of:

[0050] (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;

[0051] (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 power of 400W...

Embodiment 2

[0058] A preparation method for a graphene-ionic liquid composite electrode, comprising the steps of:

[0059] (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 hour, 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 to dry at 90°C for 5 hours to obtain pure copper chloride intercalated graphite;

[0060] (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, keep the EtMeImCl solven...

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Abstract

The invention discloses a preparation method of a graphene-ionic liquid composite electrode. The method comprises adding chloride intercalated graphite into a molten ionic liquid for ultrasonic stripping for 0.5 to 24 hours with power being 400 to 800W, and obtaining a liquid mixture of graphene, the ionic liquid and chloride; putting the liquid mixture in an electric field environment for centrifugation for 1 to 10 minutes, removing the supernate, and obtaining a graphene-ionic liquid composite material; and putting the obtained graphene-ionic liquid composite material in a mould, applying pressure of 10 to 30Mpa to a mould cap, cooling the graphene-ionic liquid composite material to room temperature, and solidifying the graphene-ionic liquid composite material, and obtaining the graphene-ionic liquid composite electrode. According to the method, ultrasonic treatment is performed on the intercalated graphite suspended on the ionic liquid, and the graphene electrode is formed by directly compacting the prepared graphene-ionic liquid composite material. The preparation of the graphene-ionic liquid composite electrode needs not to use a conductive agent or an adhesive or to prepare a current collector separately, and therefore the efficiency of the graphene-ionic liquid composite electrode is improved, and the preparation method is also simplified.

Description

technical field [0001] The invention relates to the field of electrochemical power sources, in particular to a graphene-ionic liquid composite electrode, a preparation method thereof, and an electrochemical capacitor. Background technique [0002] Electrochemical capacitor is a new type of energy storage device between capacitor and battery. Compared with conventional capacitors, electrochemical capacitors have a higher specific capacity. In recent years, with the development of electrochemical capacitors, electrochemical capacitors using graphene as electrode materials have gradually appeared. In the prior art, the electrode of this type of electrochemical capacitor is mainly made of graphene material, acetylene black is added as a conductive agent, and polyvinylidene fluoride is used as a binder. After making a slurry, it is coated on a metal foil, dried and cut. Forming to obtain electrode sheets. The addition of conductive agents, binders, and current collectors (ie, ...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/38H01G11/52
CPCY02E60/13
Inventor 周明杰王要兵袁新生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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