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Method for manufacturing crumpled graphene composite, composite manufactured thereby, and supercapacitor including composite

A technology of graphene and composites, which is applied in the direction of hybrid capacitor electrodes, hybrid capacitor separators, hybrid capacitor electrolytes, etc., can solve the problems of difficult penetration of electrolytes, achieve good conductivity, low interface resistance, and increase interplanetary spacing.

Active Publication Date: 2019-07-30
KOREA INST OF GEOSCI & MINERAL RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem that the electrolyte is difficult to penetrate into the electrode of the composite body as re-lamination and aggregation phenomena have been occurring between the graphene sheets of the two-dimensional structure.

Method used

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  • Method for manufacturing crumpled graphene composite, composite manufactured thereby, and supercapacitor including composite
  • Method for manufacturing crumpled graphene composite, composite manufactured thereby, and supercapacitor including composite
  • Method for manufacturing crumpled graphene composite, composite manufactured thereby, and supercapacitor including composite

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preparation example Construction

[0077] The first embodiment of the present invention provides a method for preparing a wrinkled graphene-carbon nanotube composite body, comprising: preparing a colloid mixed solution formed by mixing acid-treated carbon nanotubes, graphene oxide and a solvent (step 1) (S10); and spray drying the above mixed solution, and performing heat treatment (step 2) (S20).

[0078] In the existing research on graphene-carbon nanotube composites, there is a problem that the electrolyte is difficult to penetrate into the electrodes of the composites as the re-lamination and condensation phenomena have been occurring between the two-dimensionally structured graphene sheets. Moreover, due to the van der Waals attraction between carbon nanotubes, the aggregation phenomenon occurs between carbon nanotubes, so that the specific capacitance tends to decrease with the increase of current density.

[0079] In order to solve the problem of relamination and aggregation of two-dimensional graphene a...

Embodiment 1

[0194] Preparation 1 of wrinkled graphene-carbon nanotube composite

[0195] Graphene oxide (GO), used as a raw material for preparing graphene, was prepared by dispersing in distilled water after being prepared from graphite according to a modified HumMer's method (HumMer's method).

[0196] Step 1: In order to improve the dispersibility of multi-walled carbon nanotubes (95% purity, NANOLAB) to water, acid treatment was performed. Disperse 1 g of multi-walled carbon nanotubes in 150 mL of sulfuric acid (H 2 SO 4 , 99.5%) and 50mL of nitric acid (HNO 3 ) into the mixed solution, and stirred at a temperature of 70° C. for 2 hours. Subsequently, it was washed by filtration with 5% hydrochloric acid (HCl) solution and dried in air. A mixed solution was prepared with the acid-treated multi-walled carbon nanotubes and graphene oxide at a weight ratio of 0.01:1 and distilled water as a solvent. At this time, the graphene oxide concentration of the mixed solution was 0.25% by...

Embodiment 2

[0199] Preparation 2 of wrinkled graphene-carbon nanotube composite (multi-walled carbon nanotube: graphene oxide weight The amount ratio is 0.05:1)

[0200] In step 1 of the above example 1, except that the weight ratio of multi-walled carbon nanotubes: graphene oxide was changed to 0.05:1 to prepare the mixed solution, the wrinkled graphene was prepared in the same manner as in the above example 1 - Multi-walled carbon nanotube composites.

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Abstract

The present invention relates to: a method for manufacturing a crumpled graphene composite. The method comprises a step of spraying, drying, and thermally treating a solution containing graphene oxideand a conductive material; a graphene composite manufactured thereby; and a supercapacitor to which an electrode including the same is applied.

Description

technical field [0001] The present invention relates to a preparation method of a wrinkled graphene composite body, a graphene composite body prepared therefrom and a supercapacitor containing it, and more specifically, to steps including spray drying and heat treatment of a solution containing graphene oxide and a conductive substance A method for preparing a wrinkled graphene composite, a graphene composite prepared thereby, and a supercapacitor comprising the same. Background technique [0002] With the increasing demand for energy storage devices with high energy and high power density, supercapacitors have attracted much attention as one of the new generation of environmentally friendly energy storage devices. Compared with existing secondary batteries, this supercapacitor has the advantages of high power density and charge-discharge efficiency, semi-permanent cycle life, and stability to current changes without explosion hazard. Therefore, it is actively used in porta...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/36H01G11/52H01G11/54H01G11/66C01B32/168C01B32/182H01G11/32
CPCC01B32/168C01B32/182H01G11/32H01G11/36H01G11/52H01G11/54H01G11/66H01G11/86Y02E60/13
Inventor 张喜栋蒋韩权崔志赫吉大燮金亨锡裵仁国徐宙范赵恩姬
Owner KOREA INST OF GEOSCI & MINERAL RESOURCES
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