Graphene oxide slurry, miniature graphene electrode and preparation method thereof and miniature graphene supercapacitor

A graphene electrode, graphene technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, inks, etc. The micro pattern is clear, the influence is small, and the capacitance performance is good.

Active Publication Date: 2017-11-07
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, although the preparation of micro-graphene electrodes has been reported in the literature, its research and development are still in a relatively early stage, and the preparation methods are relatively complicated and costly.
For example, a conductive graphene carbon paste ink and its preparation method disclosed in Chinese invention patent 201410057131.3, a conductive ink based on graphene composite material and its preparation method disclosed in Chinese invention patent 201510090294.6, these disclosed graphene conductive inks, all Graphene slurry with high cost is used, and graphene is easy to agglomerate and has poor uniformity. Therefore, most of the current research on graphene supercapacitors is to use graphene as an electrode material in a three-electrode system. Most of the printing methods prepare traditional planar curled graphene supercapacitors (i.e., stacked configuration), however, recent studies have found that this stacked configuration is not conducive to the transport of electrolyte ions, and this structure has a large volume , difficult to be compatible with microelectronics

Method used

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  • Graphene oxide slurry, miniature graphene electrode and preparation method thereof and miniature graphene supercapacitor
  • Graphene oxide slurry, miniature graphene electrode and preparation method thereof and miniature graphene supercapacitor
  • Graphene oxide slurry, miniature graphene electrode and preparation method thereof and miniature graphene supercapacitor

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Embodiment 1

[0044] A preparation method of a graphene interdigitated electrode micro supercapacitor (MSC) of the present invention, comprising the following steps:

[0045] (1) Configuration of graphene oxide slurry:

[0046] Stir and dissolve polyvinylidene fluoride (PVDF) in N-methyl-2-pyrrolidone (NMP), among them, PVDF is used as a binder with a solid content of 0.5%, and the mixture of polyvinylidene fluoride and N-methylpyrrolidone The mass ratio is 1:199. Then add graphene oxide, the mass ratio of graphene oxide to PVDF is 20:1, and select a planetary gravity mixer to stir for 10 minutes to prepare graphene oxide slurry. In the present embodiment, graphene oxide is prepared by the Hummers method, and the specific preparation process is as follows:

[0047] (a) Add 3g of graphite and 18g of KMnO4 into a three-necked flask, stir evenly with a magnetic force, and cool to about 5°C to obtain a mixed solution A;

[0048] (b) Dissolve 360ml of H 2 SO 4 with 40ml of H 3 PO 4 Mix ev...

Embodiment 2

[0058] A method for preparing a graphene interdigitated electrode miniature supercapacitor (MSC) of the present invention is basically the same as in Example 1, the only difference being that the preparation process of step (3) graphene interdigitated electrode is as follows: (2) The obtained graphene oxide miniature interdigitated electrodes were suspended and fixed in a round-bottomed flask, and 5 ml of hydriodic acid (HI) with a mass fraction of 30% was added to the round-bottomed flask, refluxed at 90°C for 1 h, and then anhydrous Cleaned with ethanol to obtain graphene miniature interdigitated electrodes.

Embodiment 3

[0060] A preparation method of a graphene interdigitated electrode miniature supercapacitor (MSC) of the present invention is basically the same as Example 2, the only difference being that the preparation process of step (3) graphene interdigitated electrode is as follows: (2) The obtained graphene oxide micro-interdigitated electrodes were placed in an infrared drying oven, and the photothermal reduction was carried out by an infrared lamp for 1 h to obtain graphene micro-interdigitated electrodes.

[0061] Figure 5 Figures A, B, and C are physical pictures of the graphene micro-interdigitated electrodes prepared in steps (3) of Examples 1 to 3, wherein, Figure A is Example 1, Figure B is Example 2, and Figure C is Example 3. Figure 5 The obvious comb-like structure can be seen in the A ~ C diagrams, and the area of ​​the interdigitated electrodes is 16.9mm. 2 , which shows that the graphene oxide slurry prepared in step (1) is suitable for printing.

[0062] Figure 6...

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Abstract

The invention discloses graphene oxide slurry, a miniature graphene electrode and a preparation method thereof and a miniature graphene supercapacitor. The graphene oxide slurry comprises the following components in parts by weight: 15-35 parts of graphene oxide, 1-3 parts of bonding resin and 150-200 parts of a solvent. The miniature graphene electrode is prepared from the graphene oxide slurry through the steps of printing and reduction. The miniature graphene supercapacitor comprises the miniature graphene electrode and an electrolyte, wherein the electrolyte covers a positive electrode and a negative electrode of the miniature graphene electrode. The preparation route from the graphene oxide electrode to the graphene electrode and then to the miniature graphene supercapacitor is simple and low in cost. The prepared miniature graphene supercapacitor with a two-dimensional planar structure is good in capacitance performance and convenient for being integrated into a chip electronic product.

Description

technical field [0001] The invention belongs to the technical field of micro-energy storage, and in particular relates to a graphene oxide slurry, a micro-graphene electrode and a preparation method thereof, and a micro-supercapacitor. Background technique [0002] The rapid development of integrated electronic products has increased the demand for miniaturization and chip energy storage units, and the electronics industry is developing towards miniature, portable, flexible and highly integrated electronic products. Thin-film batteries or micro-batteries have been used in commercial miniaturized devices, but they have a short service life, complex structures, and are difficult to integrate. Supercapacitors can overcome these shortcomings. Supercapacitors (also known as electric double layer capacitors) are a new type of energy storage element that combines the high energy density of traditional batteries and the high power characteristics of electrolytic capacitors. It has g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/86C09D11/106C09D11/03
CPCY02E60/13H01G11/36C09D11/03C09D11/106H01G11/86
Inventor 王建方蔡凤莲陶呈安高海峰黄坚郭晨星王芳李玉姣
Owner NAT UNIV OF DEFENSE TECH
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