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Preparation method of porous network structure graphene/polyaniline composite dry gel

A technology of network structure and composite hydrogel, which is applied in the field of preparation of porous network structure graphene/polyaniline composite xerogel, can solve the problem of non-self-supporting supercapacitor electrodes, poor mechanical strength of PANI hydrogel, and influence on electrolysis Liquid diffusion ion migration and other issues, to achieve the effect of good electrochemical cycle stability, conducive to diffusion and transmission, and high mechanical strength

Active Publication Date: 2019-10-22
SHENYANG UNIV
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Problems solved by technology

However, the mechanical strength of PANI hydrogel prepared in phytic acid (PA) or hydrochloric acid (HCl) is usually poor, and it is not self-supporting as a supercapacitor electrode, and a certain amount of binder needs to be added, and the binder is not conductive. , and will affect the diffusion of the electrolyte and the migration of ions, and ultimately affect the performance of the electrode
Combining PANI hydrogel with a non-conductive polymer can improve the mechanical strength to a certain extent. Although it can be used as a self-supporting electrode, it usually exhibits low rate characteristics and poor cycle stability.

Method used

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  • Preparation method of porous network structure graphene/polyaniline composite dry gel
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preparation example Construction

[0019] A method for preparing a high-strength three-dimensional porous network structure graphene / polyaniline composite xerogel, comprising the following steps:

[0020] (1) Preparation of graphene oxide (GO): GO was prepared by the improved Hummers method;

[0021] (2) Preparation of cross-linked polyaniline conductive paste: 5 mg of PPD and 50 mg of aniline were dissolved in 20 ml of phytic acid solution, and 0.25 g of ammonium persulfate was dissolved in 10 ml of phytic acid solution. The concentration is 0.05 mol / liter, the temperature of the above two groups of solutions is controlled at 0°C, quickly mix the two groups of solutions and stir vigorously, stop stirring when the solution starts to change color, and let it stand for 3 hours to obtain cross-linked conductive polyaniline slurry;

[0022] (3) Preparation of high-strength three-dimensional porous network structure graphene / polyaniline composite xerogel: the polyaniline conductive slurry was directly mixed with th...

Embodiment 2

[0025] A high-strength three-dimensional porous network structure graphene / polyaniline composite xerogel method, comprising the following steps:

[0026] (1) Preparation of graphene oxide (GO): GO was prepared by the improved Hummers method;

[0027] (2) Preparation of cross-linked polyaniline conductive paste: 5 mg of PPD and 100 mg of aniline were dissolved in 20 ml of phytic acid solution, and 0.5 g of ammonium persulfate was dissolved in 10 ml of phytic acid solution. The concentration is 0.1 mol / liter. The temperature of the above two groups of solutions is controlled at 0°C. The two groups of solutions are quickly mixed and stirred vigorously. When the solution starts to change color, stop stirring and let it stand for 3 hours. Obtain cross-linked conductive polyaniline paste;

[0028] (3) Preparation of high-strength three-dimensional porous network structure graphene / polyaniline composite xerogel: the polyaniline conductive slurry was directly mixed with the GO disper...

Embodiment 3

[0030] A high-strength three-dimensional porous network structure graphene / polyaniline composite xerogel method, comprising the following steps:

[0031] (1) Preparation of graphene oxide (GO): GO was prepared by the improved Hummers method;

[0032] (2) Preparation of cross-linked polyaniline conductive paste: 10 mg of PPD and 200 mg of aniline were dissolved in 20 ml of phytic acid solution, and 1 g of ammonium persulfate was dissolved in 10 ml of phytic acid solution. The concentration is 0.05 mol / liter, the temperature of the above two groups of solutions is controlled at 0°C, quickly mix the two groups of solutions and stir vigorously, stop stirring when the solution starts to change color, and let it stand for 3 hours to obtain cross-linked conductive polyaniline slurry;

[0033] (3) Preparation of high-strength three-dimensional porous network structure graphene / polyaniline composite xerogel: the polyaniline conductive slurry was directly mixed with the GO dispersion t...

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Abstract

Relating to a preparation method of a nano composite energy storage dry gel, the invention provides a preparation method of a porous network structure graphene / polyaniline composite dry gel. The method includes: preparation of graphene oxide (GO), preparation of a cross-linked polyaniline conductive slurry (gel), and preparation of a high-strength three-dimensional porous network structure graphene / polyaniline composite dry gel: directly mixing the polyaniline conductive slurry with a GO dispersion liquid to prepare a GO and polyaniline slurry blended composite slurry so as to obtain a graphene / polyaniline composite hydrogel, repeatedly soaking the obtained graphene / polyaniline composite hydrogel in hot alcohol and water for dialysis until the solution becomes colorless, and performing freeze-drying to obtain the high-strength three-dimensional porous network structure graphene / polyaniline dry gel. The dry gel prepared by the method provided by the invention has the characteristics ofgood conductivity, high specific capacitance, good electrochemical cycling stability, high mechanical strength, easily available raw materials, simple preparation process and low cost, has positive impact on development of novel supercapacitor electrode materials, and at the same time, the high-strength porous structure lays a research foundation for the development of all solid-state supercapacitors in the future.

Description

technical field [0001] The invention relates to a preparation method of a nanocomposite energy storage xerogel, in particular to a preparation method of a graphene / polyaniline composite xerogel with a porous network structure. Background technique [0002] Gel materials with excellent three-dimensional porous network structures have been extensively studied in the fields of various sensors, tissue engineering, biomedicine, and supercapacitors. [0003] Supercapacitors are high-power devices that are potential candidates for electronics and hybrid vehicles due to their fast charge / discharge, high cycle life, and power density. Flexible supercapacitors have broad application prospects in wearable electronics, artificial electronic skin, and other portable electronics due to their excellent bendable and foldable properties. Currently, the latest progress on flexible electrode materials mainly focuses on carbon-based and conductive polymer gel materials. However, the applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L79/02C08K3/04
CPCC08J9/28C08J9/0066C08J2201/0484C08J2379/02
Inventor 侯朝霞李建君李伟
Owner SHENYANG UNIV
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