Graphene/carbon nano-tube composite material, preparation method and application thereof

A technology of carbon nanotubes and composite materials, which is applied in the field of electrochemical materials, can solve the problems of unusable energy storage, low energy storage capacity of graphene, and easy agglomeration of graphene sheets, so as to improve electrical conductivity and realize large-scale The effect of industrialized production and easy operation

Inactive Publication Date: 2014-06-04
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

[0003] As a two-dimensional monolayer material, graphene has a high specific surface area and high electrical conductivity. It is an ideal electrode material for electrochemical capacitors. However, graphene sheets are easy to agglomerate, resulting in many graphene sheets. The surface cannot be used for energy storage, so the energy storage capacity of graphene is not high

Method used

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Examples

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preparation example Construction

[0027] The preparation method of the composite electrode material adopts an oxidation-reduction method, and the equipment and process are simple, easy to operate, and easy to realize large-scale industrial production.

[0028] The graphene / carbon nanotube composite material prepared by the above method comprises 50% to 90% of graphene and 10% to 50% of carbon nanotubes according to the mass ratio. This graphene / carbon nanotube composite material has low graphene sheet agglomeration, and centrifugal treatment will make the composite material have a better conductive grid and improve the electrical conductivity of the material, so that the composite material can be used as an electrical conductor. Electrode materials for chemical capacitors have high energy storage capacity and rate performance.

[0029] The following are the applications of graphene / carbon nanotube composites

[0030] Graphene / carbon nanotube composite materials are generally used as electrode materials for el...

Embodiment 1

[0037] The present invention prepares the technological process of graphene / carbon nanotube composite material as follows:

[0038] Graphite → graphite oxide → graphene oxide / carbon nanotube composite → graphene / carbon nanotube composite

[0039] (1) Graphite: purity 99.5%;

[0040] (2) Graphite oxide: Weigh 1g of graphite with a purity of 99.5% in (1) and add it to a mixed solution consisting of 90ml of concentrated sulfuric acid (98% by mass fraction) and 25ml of concentrated nitric acid (65% by mass fraction). Place in an ice-water mixed bath environment and stir for 20 minutes, then slowly add 6g of potassium permanganate to the mixture, stir for 1 hour, then heat the mixture to 85°C and keep it for 30 minutes, then add 92ml of deionized water Continue to keep at 85°C for 30 minutes, finally add 10ml of hydrogen peroxide solution (mass fraction 30%), stir for 10 minutes, filter the mixture with suction, and then use 100ml of dilute hydrochloric acid and 150ml of deionized...

Embodiment 2

[0044] The present invention prepares the technological process of graphene / carbon nanotube composite material as follows:

[0045] Graphite → graphite oxide → graphene oxide / carbon nanotube composite → graphene / carbon nanotube composite

[0046] (1) Graphite: 99.5% purity;

[0047] (2) Graphite oxide: Weigh 5g of graphite with a purity of 99.5% in (1) and add it to a mixed solution consisting of 475ml of concentrated sulfuric acid (98% by mass fraction) and 120ml of concentrated nitric acid (65% by mass fraction). Place in an ice-water mixed bath environment and stir for 20 minutes, then slowly add 20g of potassium permanganate to the mixture, stir for 1 hour, then heat the mixture to 85°C and keep it for 30 minutes, then add 92ml of deionized water Continue to keep at 85°C for 30 minutes, finally add 30ml of hydrogen peroxide solution (mass fraction 30%), stir for 10 minutes, filter the mixture with suction, and then use 300ml of dilute hydrochloric acid and 450ml of deioni...

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Abstract

The invention belongs to the field of electrochemical materials, and discloses a graphene / carbon nano-tube composite material, a preparation method and an application thereof. The electrode material comprises, by mass, 50-90% of graphene and 10-50% of carbon nano-tubes. According to the graphene / carbon nano-tube composite material, agglomeration of the graphene lamellas is low, such that the high energy storage capacity is provided when the composite material is adopted as the electrochemical capacitor electrode material.

Description

technical field [0001] The invention relates to the field of electrochemical materials, in particular to a graphene / carbon nanotube composite material and its preparation method and application. Background technique [0002] As a new type of energy storage device, electrochemical capacitor is another energy storage device with great application potential and development value after lithium-ion batteries due to its fast charge and discharge rate, high power density, and long cycle life. However, low energy density is a key factor restricting the development and application of supercapacitors, and exploring how to increase the energy density of supercapacitors is the focus of current research in this field. According to the calculation formula of energy density , improving the energy density mainly starts from two aspects, one is to increase the voltage window of the electrochemical capacitor; the other is to increase the specific capacity of the electrode material. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B31/04H01G9/042C01B32/158C01B32/192
CPCY02E60/13
Inventor 周明杰钟辉王要兵刘大喜
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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