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Preparation method for graphene aerogel composite electrode material loaded on nickel foam

A technology of graphene airgel and graphene hydrogel, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problem of small specific surface area of ​​graphene sheet electrode materials, and improve specific capacitance Value cycle and rate performance, improve electrochemical performance, reduce the effect of accumulation and agglomeration

Inactive Publication Date: 2018-11-06
HEILONGJIANG UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a graphene airgel composite electrode material loaded on foamed nickel in order to solve the problems of accumulation and agglomeration of graphene sheets and the small specific surface area of ​​electrode materials

Method used

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  • Preparation method for graphene aerogel composite electrode material loaded on nickel foam
  • Preparation method for graphene aerogel composite electrode material loaded on nickel foam
  • Preparation method for graphene aerogel composite electrode material loaded on nickel foam

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specific Embodiment approach 1

[0016] Specific embodiment one: the preparation method of a kind of graphene airgel composite electrode material loaded on the nickel foam of this embodiment is carried out according to the following steps:

[0017] One, adjust the pH value of graphene oxide dispersion liquid to 8-10 with ammoniacal liquor, then add reducing agent ammoniacal liquor, obtain mixed solution; Wherein the mass ratio of graphene oxide and ammoniacal liquor is 1:(1.7-1.9);

[0018] 2. Add the pretreated nickel foam in the mixed solution, and put it into the reactor for hydrothermal reaction to obtain the graphene hydrogel loaded on the nickel foam; wherein the graphene loading on the nickel foam is 50- 70 mg;

[0019] 3. Dialyzing the obtained graphene hydrogel supported on the nickel foam in an aqueous ethanol solution, and then freeze-drying to obtain a graphene airgel composite electrode material supported on the nickel foam.

[0020] The beneficial effect of this implementation mode:

[0021] O...

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the preparation method of graphene oxide dispersion liquid is: (1) the preparation process of graphene oxide: under the condition of 0-5 ℃ ice-water bath, graphite powder Mix with concentrated sulfuric acid, then add potassium permanganate, then place it in a water bath at 45°C and stir for 1 hour, add deionized water A, stir at 90°C for 10 minutes, pour in deionized water B and a mass fraction of 30% over Oxidize hydrogen to obtain solution A; the mass volume ratio of graphite powder, potassium permanganate and concentrated sulfuric acid is 1g:3g:23mL, and the volume ratio of concentrated sulfuric acid: deionized water A: deionized water B: hydrogen peroxide is 23:50: 120:2; the mass concentration of concentrated sulfuric acid is 98%; (2) washing and drying of the graphene oxide dispersion: the hydrochloric acid of solution A and 3mol / L is mixed, then centrifugal 5 minutes un...

specific Embodiment approach 3

[0023] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the concentration of the graphene oxide dispersion is 2-5 mg / mL. It is the same as the specific embodiment 1 or 2.

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Abstract

The invention relates to a preparation method for a graphene aerogel composite electrode material loaded on nickel foam. The preparation method aims to solve the problem of accumulation and agglomeration of graphene sheet layers and small specific surface area of an electrode material. The preparation method comprises the steps that the pH value of graphene oxide dispersion liquid is adjusted to be 8-10 through ammonia water, and then reducing agent ammonia water is added; the pretreated nickel foam is added into a mixing solution, and the mixing solution is put into a reaction kettle for a hydrothermal reaction; and then dialysis is conducted in an ethanol aqueous solution, and then freeze drying is conducted. The specific capacitance of an electrode prepared by adopting the graphene aerogel composite electrode material is 216F / g under the current density of the 1A / g, the cyclicity and rate capability of the specific capacitance value of the electrode material are excellent, and aftercirculation for thousands of times, the capacitance retention rate is 92%. The preparation method is applied to the field of electrode materials.

Description

technical field [0001] The invention relates to a method for preparing a graphene airgel composite electrode material loaded on foamed nickel. Background technique [0002] Graphene has excellent electrical, optical, and mechanical properties, but there are various problems in the direct use of flake graphene as an electrode material, such as easy agglomeration, and the inability to prepare larger graphene sheets due to the constraints of natural conditions. These shortcomings severely limit the application of graphene in batteries, so reducing the accumulation of graphene sheets becomes particularly important. At present, preparing a porous three-dimensional graphene macrostructure with a large specific surface area is still a huge challenge in the field of supercapacitors. Contents of the invention [0003] The object of the present invention is to provide a method for preparing a graphene airgel composite electrode material loaded on foamed nickel in order to solve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/26H01G11/24H01G11/36
CPCH01G11/24H01G11/26H01G11/36H01G11/86Y02E60/13
Inventor 廉永福赵晓宇
Owner HEILONGJIANG UNIV
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