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Graphene flexible composite electrode, preparation method thereof and flexible super capacitor

A technology for supercapacitors and composite electrodes, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor current collectors, etc., can solve the problems affecting the performance stability of capacitors, poor fracture resistance, etc. The effect of performance, stable performance and simple and easy preparation process

Active Publication Date: 2017-09-29
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrode using three-dimensional graphene has defects such as poor fracture resistance, which affects the performance stability of the capacitor.

Method used

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  • Graphene flexible composite electrode, preparation method thereof and flexible super capacitor
  • Graphene flexible composite electrode, preparation method thereof and flexible super capacitor
  • Graphene flexible composite electrode, preparation method thereof and flexible super capacitor

Examples

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preparation example Construction

[0048] The present invention also provides a preparation method of the graphene flexible composite electrode described in the above technical solution, comprising the following steps:

[0049] a) using a metal foam sheet as a template, using a chemical vapor deposition method to grow and deposit three-dimensional graphene on the template, and remove the metal foam sheet by chemical etching to obtain a three-dimensional graphene current collector;

[0050] b) Coating polydimethylsiloxane colloid on the surface of the polydimethylsiloxane film, placing a part of the three-dimensional graphene current collector in the colloid, heating and curing to form an integrated substrate-collector;

[0051] c) Depositing electrode active materials on the three-dimensional graphene current collector in the integrated substrate-current collector by using an electrochemical deposition method to obtain a graphene flexible composite electrode.

[0052] According to the present invention, a metal...

Embodiment 1

[0072] 1.1 Preparation of graphene flexible composite electrode:

[0073] Put the foamed nickel sheet in the tube furnace, pass hydrogen gas at 180 sccm and raise the temperature to 1000°C, then pass methane at 18 sccm for 30 min; then move the furnace body through the slide rail to cool down at room temperature. The nickel foam sheet grown with three-dimensional graphene was placed in FeCl 3 In a mixed solution with HCl, the nickel foam sheet was etched and removed at 80° C., and then washed and dried with ultrapure water and ethanol in sequence to obtain a three-dimensional graphene thin film current collector.

[0074] A mixture of PDMS prepolymer and curing agent (Dow Corning SYLGARD 184 silicone rubber) with a mass ratio of 10:1 was coated on the surface of a glass plate, and heated and cured at 90°C to form a transparent PDMS film. Coating PDMS colloid (Dow Corning SYLGARD 184 silicone rubber) on the surface of the obtained PDMS film, the thickness of the colloid is low...

Embodiment 2

[0083] 1.1 Preparation of graphene flexible composite electrode:

[0084] Put the foamed nickel sheet in the tube furnace, pass hydrogen gas at 180 sccm and raise the temperature to 1000°C, then pass methane at 18 sccm for 30 min; then move the furnace body through the slide rail to cool down at room temperature. The nickel foam sheet grown with three-dimensional graphene was placed in FeCl 3 In a mixed solution with HCl, the nickel foam sheet was etched and removed at 80° C., and then washed and dried with ultrapure water and ethanol in sequence to obtain a three-dimensional graphene thin film current collector.

[0085] The obtained three-dimensional graphene thin film current collector was photolithographyed with a laser beam of 532nm, the spot size was 10 μm, and the photolithography power of the laser beam was 0.5W, to obtain an interdigitated current collector.

[0086] A mixture of PDMS prepolymer and curing agent (Dow Corning SYLGARD 184 silicone rubber) with a mass r...

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Abstract

The invention provides a graphene flexible composite electrode, a preparation method thereof and a flexible super capacitor. The graphene flexible composite electrode comprises a polydimethylsiloxane substrate, a three-dimensional graphene current collector and an electrode active material. The polydimethylsiloxane substrate is filled with a part of the three-dimensional graphene current collector and the other part of the three-dimensional graphene current collector is loaded on the electrode active material. The flexible composite electrode can make the specific capacities of the flexible super capacitor and a flexible micro super capacitor reach 0.5 to 1F / cm2 and 30 to 50mF / cm2 respectively and maintain capacity retention ratios over 80% after repeated bending by 5000 and 2000 times respectively.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a graphene flexible composite electrode, a preparation method thereof and a flexible supercapacitor. Background technique [0002] With the advancement of science and technology, the rapid development of industrialization and informatization, electronic products such as computers and mobile phones have become necessities in life, and these electronic products are gradually moving towards portability, such as the transformation from desktops to notebooks; and for portable For modernized electronic equipment, its energy storage system needs to have good power supply performance to make electronic equipment free from the constraints of a fixed power supply and become a mobile device that can be used conveniently. So far, supercapacitors have become the most widely used energy storage devices in mobile electronic devices due to their advantages of high capacity, high power de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/28H01G11/68H01G11/86
CPCY02E60/13H01G11/28H01G11/68H01G11/86
Inventor 刘跃文周旭峰刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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