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Flexible porous graphene film electrode, preparation method thereof and application of flexible porous graphene film electrode in flexible energy storage

A graphene film, graphene technology, applied in cable/conductor manufacturing, hybrid capacitor electrodes, circuits, etc., can solve problems such as slow ion transmission and poor electrochemical performance

Active Publication Date: 2021-07-06
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the technical problem to be solved by the present invention is to provide a graphene composite film and its preparation method and application, especially a kind of flexible porous graphene film electrode and its preparation method and its application in flexible energy storage. The graphene composite film provided by the invention can achieve a better three-dimensional porous structure design, realize the controllable adjustment of the three-dimensional structure of the graphene film, obtain a graphene macroscopic material with a specific microstructure with more excellent functions, and improve the density of the graphene film electrode Stacking, slow ion transport, poor electrochemical performance, etc.

Method used

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  • Flexible porous graphene film electrode, preparation method thereof and application of flexible porous graphene film electrode in flexible energy storage
  • Flexible porous graphene film electrode, preparation method thereof and application of flexible porous graphene film electrode in flexible energy storage
  • Flexible porous graphene film electrode, preparation method thereof and application of flexible porous graphene film electrode in flexible energy storage

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preparation example Construction

[0075] The invention provides a kind of preparation method of graphene composite film, comprises the following steps:

[0076] 1) After mixing the conductive polymer aqueous solution and the organic solvent, a mixed solution is obtained, and then graphene is added and mixed again to obtain a slurry;

[0077] 2) The slurry obtained in the above steps is formed into a film, and then annealed to obtain a graphene composite film.

[0078] In the invention, firstly, the conductive polymer aqueous solution and the organic solvent are mixed to obtain a mixed solution, and then graphene is added and mixed again to obtain a slurry.

[0079] In the present invention, the conductive polymer preferably includes poly(3,4-ethylenedioxythiophene)-polystyrenesulfonic acid (PEDOT:PSS). Specifically, it can be PEDOT:PSS500(PH500), PEDOT:PSS1000(PH1000) and PEDOT:PSS4083(PH4083) in the (PEDOT:PSS) series.

[0080] In the present invention, the organic solvent preferably includes one or more of...

Embodiment

[0117] (1) Selection of materials

[0118] Select commercially available highly conductive graphene powder, conductive polymer aqueous solution PH1000, and organic solvent DMSO.

[0119] (2) Preparation of slurry

[0120] 1) Add DMSO into water, and make a homogeneous solution through ultrasonication (sink type ultrasonic machine) for 5-10 minutes, wherein the proportion of DMSO is selected as 10% (accounting for the final solution).

[0121] 2) Add PH1000 aqueous solution, and undergo ultrasonication (cell crushing ultrasonic machine, 1000W, 1min; sink type ultrasonic machine for 15min), so that the entangled polymer chains of PH1000 are stretched out.

[0122] 3) Add graphene powder to the above solution, so that the mass ratio of graphene to PH1000 is 1:0 (comparison), 1:0.1, 1:0.3, 1:1. Further ultrasonic treatment (cell crushing ultrasonic machine, 1000W, 1min; sink type ultrasonic machine 30min), makes PH1000 fully self-assemble on the graphene surface.

[0123] (3) F...

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Abstract

The invention provides a graphene composite film. The graphene composite film is formed by stacking a plurality of graphene sheets, pores are formed between the graphene sheets; the surface of the graphene sheet is modified with a conductive polymer. According to the preparation method, high-conductivity graphene is directly assembled into a thin film material with a three-dimensional network structure, a graphene three-dimensional network with high conductivity and certain flexibility is constructed by utilizing the design that graphene is combined with a conductive high-molecular polymer to construct a three-dimensional structure, and controllable adjustment of the three-dimensional structure of the graphene thin film is realized; and the problems of dense stacking, slow ion transmission, poor electrochemical performance and the like of the graphene film electrode are solved. The graphene film provided by the invention has certain flexibility and tensile property, an internal macromolecular chain can be fully stretched, and the graphene film has good mechanical property. And the size and the shape of the graphene film can be customized, so that the requirements of various devices are met.

Description

technical field [0001] The invention belongs to the technical field of flexible thin film electrodes, and relates to a graphene composite thin film and its preparation method and application, in particular to a flexible porous graphene thin film electrode and its preparation method and its application in flexible energy storage. Background technique [0002] Graphene with a sp2 hybridized hexagonal honeycomb structure composed of a single atomic layer has unique properties due to its unique crystal structure. It has a series of advantages such as high theoretical specific surface area, strong mechanical properties, and good chemical stability. It has broad application prospects in the field of energy storage. Among them, graphene-based thin film electrodes have many potential applications, such as flexible energy storage devices, micro energy storage devices, etc. However, most of the existing graphene films used in energy storage devices are densely stacked, which has pro...

Claims

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Application Information

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IPC IPC(8): H01B1/04H01B13/00H01G11/26
CPCH01B1/04H01B13/00H01G11/26
Inventor 陈稳肖涵江顺琼周旭峰刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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