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A kind of flexible supercapacitor electrode and preparation method thereof

A supercapacitor, flexible technology, applied in the field of capacitors, can solve the problems of difficult to achieve high-performance flexible supercapacitor applications, poor flexibility and mechanical stability, low tensile strength of electrodes, etc., to achieve good ion diffusion ability and charge storage ability, The effect of good mechanical properties and excellent capacitance characteristics

Active Publication Date: 2019-02-19
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the weak force between the graphene sheets and the low tensile strength of the electrode, the flexibility and mechanical stability during the bending process are poor, making it difficult to realize its application in high-performance flexible supercapacitors.

Method used

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  • A kind of flexible supercapacitor electrode and preparation method thereof
  • A kind of flexible supercapacitor electrode and preparation method thereof
  • A kind of flexible supercapacitor electrode and preparation method thereof

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preparation example Construction

[0025] The present invention also provides a kind of preparation method of above-mentioned flexible supercapacitor electrode, comprises the following steps:

[0026] A) mixing and stirring the organic dispersed phase of the surface-modified magnetic nanoparticles and the aqueous dispersed phase of graphene oxide, and centrifuging and washing after the reaction to obtain graphene oxide modified by magnetic nanoparticles, and oxidizing the modified magnetic nanoparticles Graphene is dispersed in an ethanol solution to obtain a magnetic nanoparticle-modified graphene oxide ethanol dispersion;

[0027] B) placing the graphene oxide gel on the surface of the substrate in an ethanol solution, applying a magnetic field below the graphene oxide gel, adding a magnetic nanoparticle-modified graphene oxide ethanol dispersion to the ethanol solution, The graphene oxide modified by the magnetic nanoparticles is enriched, arranged and assembled on the surface of the graphene oxide gel under...

Embodiment 1

[0045] (1) Fe modified by oleic acid / oleylamine 3 o 4 Preparation method of nanoparticles: configuring Fe(acac) 3 Benzyl alcohol solution, the concentration is 35mg / mL, add oleic acid and oleylamine in sequence, and the volume ratio of them to benzyl alcohol solution is 3:20, then stir and mix, and move the mixed solution into a high-temperature reactor for 10h at 180°C. The obtained sample Fe 3 o 4 Centrifugal washing with ethanol and toluene yielded Fe surface-modified with oleic acid / oleylamine 3 o 4 Nanoparticles were finally dispersed and stored in toluene.

[0046] (2) Fe 3 o 4 Preparation of modified graphene oxide. The Fe surface modified with oleic acid / oleylamine will be dispersed 3 o 4 The toluene organic phase (0.3 mg / mL concentration) of nanoparticles was mixed with the aqueous phase (0.3 mg / mL concentration) dispersed with graphene oxide, in which the surface of Fe modified by oleic acid / oleylamine 3 o 4 The mass ratio of nanoparticles to graphene oxi...

Embodiment 2

[0053] (1) Preparation of NiO modified graphene oxide. NiO nanoparticles with surface modified by oleic acid / oleylamine (preparation method refer to Fe 3 o 4 ) toluene organic phase (concentration: 0.3mg / mL) and the aqueous phase (concentration: 0.3mg / mL) dispersed with graphene oxide were mixed and stirred, wherein the surface of NiO nanoparticles modified with oleic acid / oleylamine and graphene oxide The mass ratio is 2:3, using the coordination effect of the oxygen-containing functional groups on the surface of the graphene oxide sheet to the NiO nanoparticles, the magnetic nanoparticles are loaded on the surface of the graphene oxide, and then centrifugally cleaned, and finally the modified NiO nanoparticles are obtained. graphene oxide, and it was dispersed in ethanol solution.

[0054] (2) Preparation of electrodes for flexible supercapacitors. Graphene oxide gel with a thickness of 1 mm and a mass concentration of 8 mg / mL was coated on a glass plate as a substrate, a...

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Abstract

The invention provides a flexible super capacitor electrode which includes graphene paper and three-dimensional porous graphene compounded on the graphene paper. The graphene paper and the three-dimensional porous graphene are closely compounded to prepare a flexible super capacitor electrode. The graphene paper is mainly used for serving as an electrode current collector and giving the electrode good mechanical property. The three-dimensional porous graphene, which has a pore structure, a large specific surface area and good ion diffusion and charge storage abilities, gives the electrode excellent capacitance characteristic. By combining the advantages of the two different graphene structures in electrode mechanical property and energy storage, a high-performance flexible electrode with good mechanical property is obtained.

Description

technical field [0001] The invention belongs to the technical field of capacitors, and in particular relates to a flexible supercapacitor electrode and a preparation method thereof. Background technique [0002] As the core component of flexible energy storage devices, flexible electrode materials directly determine the performance of the devices. In recent years, with the rapid development of research on carbon nanomaterials, the use of carbon materials with excellent electrical conductivity, light weight and large specific surface area to prepare flexible electrodes has become the mainstream of development. Among them, graphene has been widely used in the preparation of flexible electrodes due to its unique physical and chemical properties. At present, flexible graphene paper electrodes have become a research hotspot of electrode materials for flexible supercapacitors due to their light weight, good flexibility, electrical conductivity, and self-supporting ability. Howev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/36H01G11/26H01G11/86
CPCY02E60/13
Inventor 刘跃文周旭峰刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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