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Graphene electrode plate and preparing method thereof

A graphene electrode and graphene technology, applied in the field of electrochemical materials, can solve the problems of increased contact internal resistance, low power density, high equivalent series resistance of electrode sheets, etc., to reduce contact internal resistance, increase power density, reduce etc. The effect of effective series resistance

Inactive Publication Date: 2014-07-02
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing graphene is generally combined with other metal current collectors to make electrode sheets. The binder is used in the compounding, which increases the contact internal resistance between layers, making the equivalent series resistance of the electrode sheet higher, and low power density

Method used

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  • Graphene electrode plate and preparing method thereof

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[0017] A preparation method of a graphene electrode sheet provided by the present invention is composed of a graphene film and a current collector. By dispersing graphene in an ionic liquid, a stable graphene suspension is obtained, and then the graphene suspension is electrodeposited The method is deposited on the current collector to obtain a graphene electrode sheet.

[0018] Such as figure 1 Shown, the preparation technological process of a kind of graphene electrode sheet is as follows:

[0019] (1) Preparation of graphene suspension:

[0020] After mixing the graphene and the ionic liquid, grind it with an agate mortar for 5-20 minutes, and then add the mixture into the solvent for ultrasonic dispersion for 1-5 hours to form a graphene suspension with a concentration of 0.1-5 mg / ml;

[0021] Wherein, the solvent can be water, DMF, DMSO, DMAc or NMP; the ionic liquid can be an imidazole ionic liquid, or a pyrrolidine ionic liquid; the imidazole ionic liquid includes: 1-...

Embodiment 1

[0027] The preparation process of the graphene electrode sheet synthesized by the present invention is as follows:

[0028] (1) Preparation of graphene suspension: Mix 1g of graphene and 1g of 1-ethyl-3-methylimidazolium tetrafluoroborate with an agate mortar for 5min, then add the mixture into DMF solvent for ultrasonic dispersion After 5 hours, a graphene suspension with a concentration of 0.1 mg / ml was formed.

[0029] (2) Preparation of graphene electrode sheet: use the graphene suspension in (1) as the electrolyte, take two copper foils with a diameter of 5 cm as the anode electrode and the cathode electrode respectively, and place the two electrodes in parallel and symmetrically into the electrolyte , the distance between the two electrodes is 0.5cm, a 40V direct current is added to both ends of the electrodes, electrophoresis is carried out for 5min, the copper foil as the cathode is removed, and dried in a vacuum oven at 100°C to obtain a graphene electrode sheet.

Embodiment 2

[0031] (1) Preparation of graphene suspension: Mix 1g of graphene and 3g of 1-butyl-3-methylimidazolium hexafluorophosphate, grind with an agate mortar for 20min, then add the mixture into DMSO solvent for ultrasonic dispersion for 5h , forming a graphene suspension with a concentration of 2 mg / ml.

[0032] (2) Preparation of graphene electrode sheets: use the graphene suspension in (1) as the electrolyte, take two aluminum foils with a diameter of 10 cm as the anode electrode and the cathode electrode respectively, and place the two electrodes in parallel and symmetrically into the electrolyte , the distance between the two electrodes is 0.5cm, add 80V direct current at both ends of the electrodes, electrophoresis for 20min, remove the aluminum foil as the cathode, and dry it in a vacuum oven at 100°C to obtain a graphene electrode sheet.

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Abstract

The invention discloses a graphene electrode plate and a preparing method thereof. The method comprises the following steps: graphene and ionic liquid are mixed and then subjected to the ultrasonic dispersion process to obtain stable graphene suspending liquid; and the graphene suspending liquid is used as an electrolyte, two aluminum foils or copper foils which are made from a same material are inserted into the electrolyte in parallel as an anode electrode and a cathode electrode separately, a voltage is applied after electrical connection, and the cathode electrode is taken down to obtain the graphene electrode plate. According to the preparing method provided in the invention, grapheme can be better dispersed by using the ionic liquid, and the ionic liquid exists between layers of the deposited graphene, so the compatibility between the graphene and the electrolyte can be changed, and the capacity can be improved; according to the electrode plate prepared through the electro-deposition method, the complex coating process can be omitted, the process is simple, and binder does not need to be used, so the contact resistance between a current collector and an active material layer can be effectively reduced so as to reduce the equivalent series resistance of a supercapacitor, and improve the power density finally.

Description

technical field [0001] The invention relates to the field of electrochemical materials, in particular to a graphene electrode sheet and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage device, which has the advantages of high power density (more than 10 times that of ordinary batteries), high cycle life (the number of cycles can reach more than 100,000 times), and good fast charge and discharge performance. It is widely used in Military fields, mobile communication devices, computers, and hybrid power sources for electric vehicles, etc. Generally, a supercapacitor is mainly assembled by an electrode active material layer, an electrolyte, a separator, a current collector, and a casing. The energy density of existing supercapacitors is generally relatively low. The main factors affecting the energy density of supercapacitors are the capacitance of the electrode material, the voltage of the system, and the proportion of...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/32
CPCY02E60/13
Inventor 周明杰吴凤王要兵钟玲珑
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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