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Electrode of supercapacitor, preparation method of electrode and supercapacitor

A supercapacitor and electrode technology, which is applied in the field of electrochemical energy storage, can solve problems such as shape change, short cycle life, and structural collapse, and achieve the effects of wide voltage window, high load capacity, and low cost

Inactive Publication Date: 2021-05-21
ENN GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these conductive polymers suffer from structural collapse and morphology changes during repeated charging and discharging, resulting in short cycle life.
And another disadvantage is that the voltage window width of these conductive polymers in the three-electrode system does not exceed 1 V

Method used

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  • Electrode of supercapacitor, preparation method of electrode and supercapacitor
  • Electrode of supercapacitor, preparation method of electrode and supercapacitor
  • Electrode of supercapacitor, preparation method of electrode and supercapacitor

Examples

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preparation example Construction

[0043] According to an embodiment of the present invention, refer to figure 1 , the preparation method comprises:

[0044] S100: Provide electrode pole pieces.

[0045] In this step, an electrode pole piece is provided, and the electrode pole piece is formed of a carbon material. According to the embodiment of the present invention, the specific method of providing the electrode sheet is not particularly limited, for example, conductive carbon cloth or carbon paper that can be purchased from the market. In some embodiments of the present invention, the conductive carbon cloth or carbon paper can be ultrasonically cleaned for 1 to 4 hours in dilute sulfuric acid aqueous solution with a concentration of 0.5-2M, and then washed repeatedly with deionized water until neutral, and then cleaned at 40 After drying in an oven at -80°C for 4 to 12 hours, take it out for use. In this way, the surface of the conductive carbon cloth or carbon paper will be cleaner after cleaning.

[004...

Embodiment 1

[0060] In this example, a conductive carbon cloth coated with porous activated carbon powder was prepared as an electrode sheet. The specific steps are as follows:

[0061] (1) Put the conductive carbon cloth (thickness 200 microns) into dilute nitric acid with a concentration of 2M and ultrasonically clean it for 3 hours, then wash it repeatedly with deionized water until it becomes neutral, and then place the carbon cloth in an oven at 60°C to dry for 6 hours ,stand-by;

[0062] (2) The high specific area (2100mg / cm 2 ) of porous activated carbon powder, polyvinylidene fluoride, and conductive acetylene black were dispersed in NMP in a mass ratio of 8:1:1, and then made into magnetic stirring for 12 hours to obtain a uniform carbon powder slurry (concentration is 10mg / mL);

[0063] (3) Evenly coat the carbon powder slurry on the cleaned hydrophilic carbon cloth, and the carbon powder loading can be controlled at 1-15 mg / cm 2 In between, the carbon coated with the slurry w...

Embodiment 2

[0065] In this embodiment, a conductive polymer is electrochemically polymerized on the surface of the electrode sheet of Embodiment 1 as an electrode of a supercapacitor, and an asymmetric supercapacitor is assembled. The specific steps are as follows:

[0066] (1) Weigh 4,4'-ODA powder and NAPD powder, add them to sulfuric acid aqueous solution with a concentration of 1~3M respectively, and prepare an acidic solution containing monomers with a concentration of 0.02~0.08, which is used as the mother liquor for electrochemical polymerization ;

[0067](2) A piece of conductive carbon cloth treated in Example 1 was used as a working electrode and immersed in an acidic electrolyte solution in which 4,4'-ODA was dissolved, the platinum mesh was used as a counter electrode, and Ag / AgCl was used as a reference electrode. Anfa performs electrochemical polymerization on the surface of the working electrode to obtain an electrode with a composite structure of poly(4,4'-ODA) / porous ac...

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Abstract

The invention provides an electrode of a supercapacitor, a preparation method of the electrode and the supercapacitor. The electrode of the supercapacitor comprises: an electrode plate made of a carbon material; and a conductive polymer which is generated on the surface of the electrode plate in situ through electrochemical polymerization, wherein a monomer for forming the conductive polymer is a benzene-containing structure with at least two substituent groups, and the substituent groups are hydroxyl groups or amino groups. According to the electrode of the supercapacitor provided by the invention, the monomer of the conductive polymer is selected from a polyfunctional aromatic compound, so that a plurality of amino groups or hydroxyl groups on the main chain of the conductive polymer formed by in-situ electrochemical polymerization on the surface of the electrode plate participate in the oxidation-reduction process of the surface of the electrode, and the pseudocapacitance of the electrode is higher; and therefore, the voltage window of the super capacitor containing the motor is wider and the coulombic efficiency is higher.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular, the invention relates to an electrode of a supercapacitor, a preparation method thereof, and a supercapacitor. Background technique [0002] As traditional fuel vehicles are gradually replaced by electric vehicles, fossil fuels are gradually replaced by renewable energy, among which lithium-ion batteries and supercapacitors have attracted much attention. Although the energy density of lithium-ion batteries is high, their power density and cycle stability are far lower than those of supercapacitors. Moreover, the electric double-layer supercapacitor (EDLC) relies on physical adsorption and desorption between the electrolyte and the electrode material to store energy, which has the advantages of high power density, long cycle life, and is mostly used in high-power output applications. However, in real life, supercapacitors are often used as a backup power sour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/32H01G11/36H01G11/48H01G11/86
CPCH01G11/24H01G11/30H01G11/32H01G11/36H01G11/48H01G11/86Y02E60/13
Inventor 郝胐王文阁王俊美李金来
Owner ENN GRAPHENE TECH CO LTD
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