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Graphene-based flexible composite electrode material and preparation method and application thereof

An alkenyl-based flexible and composite electrode technology, applied in the fields of hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, battery electrodes, etc. Chemical properties, high film strength, cost reduction effect

Inactive Publication Date: 2017-07-07
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a graphene-based flexible composite electrode material and its preparation method, aiming to solve the problem of traditional electrode materials that need to mix binders, conductive agents and active materials and then load them on the current collector. The method is complicated. , and the prepared electrode material does not have problems such as flexibility and light weight

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  • Graphene-based flexible composite electrode material and preparation method and application thereof
  • Graphene-based flexible composite electrode material and preparation method and application thereof
  • Graphene-based flexible composite electrode material and preparation method and application thereof

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[0026] Correspondingly, an embodiment of the present invention provides a method for preparing a graphene-based flexible composite electrode material, comprising the following steps:

[0027] S01. Provide graphene and two-dimensional active materials respectively;

[0028] S02. dispersing the graphene and the two-dimensional active material in a solvent to form a mixed dispersion;

[0029] S03. The mixed dispersion liquid is subjected to layer-by-layer assembly processing to obtain a graphene-based flexible composite electrode material; or the mixed dispersion liquid is subjected to layer-by-layer assembly processing and then heat-treated to obtain a graphene-based flexible composite electrode material.

[0030] In the above step S01, the graphene is two-dimensional graphene, and the graphene is prepared by electrochemical exfoliation, or the preparation method of the graphene is: preparing graphene oxide by chemical oxidation exfoliation, for the graphite oxide Graphene is o...

Embodiment 1

[0049] A preparation method of a graphene-based flexible composite electrode material, comprising the following steps:

[0050] S11. Provide graphene and two-dimensional active materials, respectively.

[0051] Electrochemical exfoliation of graphite rods to prepare graphene: use high-purity graphite rods as working electrodes, platinum sheets as counter electrodes, 0.1MNa 2 SO 4 The aqueous solution is an electrolyte, and the working voltage is 10V. After the peeling is complete, the few-layer graphene is collected by washing, ultrasonication, and centrifugation; and the graphene is dispersed in the organic solvent DMF with a solubility of 0.5 mg / mL.

[0052] Preparation of nickel hydroxide nanosheets by chemical method: dissolve 1mL ammonia water (38%) in 50mL water, gradually add dropwise to 50mL0.04M NiCl 2 ·6H 2 O aqueous solution, stirred at 60°C for 12h, collected and dried; and dispersed nickel hydroxide nanosheets in the organic solvent DMF, with a solubility of 0....

Embodiment 2

[0059] A preparation method of graphene-based flexible composite electrode material, on the basis of preparing nickel hydroxide / graphene composite electrode material in embodiment 1, the nickel hydroxide / graphene composite electrode material is carried out in-situ heat treatment, in Ar atmosphere The heating rate was 5°C / min, the temperature was kept at 400°C for 2h, and the nickel oxide / graphene composite electrode material was obtained by natural cooling. The electrical conductivity of the graphene film, nickel oxide, and the prepared flexible composite electrode material of Example 2 are shown in Table 2.

[0060] Table 2

[0061]

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Abstract

The invention provides a graphene-based flexible composite electrode material and a preparation method and an application thereof. The graphene-based flexible composite electrode material is a flexible thin film prepared from graphene and an active material, wherein the active material is a nanosheet-shaped two-dimensional active material; and the graphene and the two-dimensional active material are alternately stacked and arranged. The preparation method for the graphene-based flexible composite electrode material comprises the following steps of providing the graphene and the two-dimensional active material separately; dispersing the graphene and the two-dimensional active material into a solvent to form a mixed dispersion liquid; performing layer-by-layer assembling processing on the mixed dispersion liquid to obtain the graphene-based flexible composite electrode material; or after performing layer-by-layer assembling processing on the mixed dispersion liquid, performing heat treatment to obtain the graphene-based flexible composite electrode material.

Description

technical field [0001] The invention belongs to the field of electrode materials, in particular to a graphene-based flexible composite electrode material and its preparation method and application. Background technique [0002] Graphene, a type of sp 2 The two-dimensional planar monomolecular layer crystal material composed of hexagonal lattices composed of hybrid carbons has attracted widespread attention from scientists all over the world since the discovery of its unique physical and chemical properties. Because graphene has a very high theoretical specific surface area, excellent electrical conductivity and excellent mechanical properties. Therefore, it is an ideal electrode material and has great application potential in energy storage fields such as supercapacitors and lithium-ion batteries. Graphene's high specific surface area and high conductivity make it widely used as a supporting substrate in the preparation of electrode materials for various energy storage dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525H01G11/30H01G11/36H01G11/46H01G11/86
CPCH01G11/30H01G11/36H01G11/46H01G11/86H01M4/366H01M4/483H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 符显珠李云明孙蓉
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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