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Graphene conducting film and application of graphene conducting film to electrochemical capacitor

A conductive thin film, graphene technology, applied in graphene, hybrid capacitor electrodes, chemical instruments and methods, etc., can solve the problems of low conductivity and specific surface area, unable to meet fast charge and discharge, etc.

Inactive Publication Date: 2013-05-01
QINGDAO ZHONG KE HAO TAI NEW MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although activated carbon is widely used in supercapacitor electrode materials due to its low cost and high specific surface area, the conductivity and specific surface area of ​​activated carbon are much lower than that of graphene, and supercapacitors prepared with activated carbon still cannot meet the requirements of rapid charging and discharging for automobiles. needs

Method used

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  • Graphene conducting film and application of graphene conducting film to electrochemical capacitor
  • Graphene conducting film and application of graphene conducting film to electrochemical capacitor
  • Graphene conducting film and application of graphene conducting film to electrochemical capacitor

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Embodiment 1

[0029] Such as figure 1 As shown, cheap graphene oxide (golden yellow) is produced by the modified Hummers method, and then the graphene oxide is made into an aqueous solution and coated on a substrate according to a certain thickness, such as biaxially oriented polyethylene terephthalate ester (BOPET) films, which were dried and then collected into rolls; the graphene oxide-coated BOPET rolls were placed in such figure 2 The vacuum chamber shown, is evacuated and uncoiled through chilled rolls while the coated graphene oxide is scanned with a laser until it becomes graphene (black), and the finished product is then rewound.

[0030] Cut the prepared graphene conductive film into 1cm 2 The electrode is prepared by adding electrolyte solution in the middle, such as image 3 The performance test of the flexible super electrochemical capacitor shown, in the figure 1-PET, 2-multilayer graphene, 3-electrolyte.

[0031] The electrolyte of the flexible super electrochemical capac...

Embodiment 2

[0034] Self-assembled graphene oxide and carbon nanotubes (CNTs) to form Figure 4 The structure shown is then coated on BOPET to prepare a conductive graphene film, and then made into an electrode.

[0035] The graphene oxide is modified by polyhexamethylene cations, or other cationic materials, such as chitosan, etc.; the CNT is modified by acid oxidation treatment, or other anionic materials, such as sodium alginate, etc., and then the two or hybrid self-assembly. The basic principle of self-assembly is that the system moves spontaneously to the direction of free energy reduction, forming covalent bonds, ionic bonds, coordination bonds, etc., thereby obtaining multilayer alternating materials, graphite oxide modified by cations and acid-oxidized CNTs with anions The self-assembled material is formed by alternate stacking by using the strong electrostatic interaction between charges. Since graphene oxide has a negative charge on its untreated surface in aqueous solution, C...

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Abstract

The invention relates to a graphene conducting film and application of the graphene conducting film to an electrochemical capacitor. The graphene conducting film comprises a substrate and graphene oxide attached on the substrate. A production method of the graphene conducting film comprises the following steps that a, graphene oxide water solution is coated on the substrate, the water solution concentration is 0.1 to 5mg / mL, and the costing thickness is 10 to 100mum; b, the coated liquid on the substrate is dried; c, the steps a and b are repeated; and d, the substrate obtained in the step c is put into a vacuum chamber, the graphene oxide is subjected to laser scanning after being cooled, and then, the rolling is carried out.

Description

technical field [0001] The invention relates to a graphene conductive film and its application in electrochemical capacitors. Background technique [0002] Graphene (graphene) refers to a hexagonal circular arrangement of carbon atoms in a flake, composed of single-atom-thick SP 2 Composed of hybrid carbon atoms, it can extend infinitely in two-dimensional space, and it is a two-dimensional material in the strict sense. In 2004, Novoselov et al. used the mechanical exfoliation method to obtain single-layer graphene for the first time, which overturned the concept that people have always believed that two-dimensional materials cannot exist stably at room temperature. Perfect graphene consists of a single layer of graphite with a hexagonal lattice, has an ideal two-dimensional crystal structure, and has a specific surface area of ​​2600m 2 g -1 . This special two-dimensional crystal structure determines that graphene has many unique properties, such as thermal conductivity...

Claims

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Application Information

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IPC IPC(8): H01B5/14H01B13/00H01G11/32C01B31/04H01M4/02H01M10/04C01B32/184C01B32/198
CPCY02E60/12Y02E60/10Y02E60/13Y02P70/50
Inventor 谈述战杨有财刘毅王德禧
Owner QINGDAO ZHONG KE HAO TAI NEW MATERIAL SCI & TECH
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