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Carbon-based/PANI composite electrode material for supercapacitor and preparation method of carbon-based/PANI composite electrode material

A supercapacitor and composite electrode technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve problems affecting cycle stability, blocked charge transfer, unfavorable ion diffusion, etc., to improve cycle stability and rate The effect of performance, realization of stacking, and simple preparation process

Active Publication Date: 2021-03-12
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existence of the substrate can effectively control the deposition morphology of polyaniline. However, the construction scheme of these carbon-based / polyaniline composites is often prepared by adding the substrate material, aniline monomer, and oxidant into the reaction vessel in a certain proportion. However, the PANI prepared by this method is often initiated and polymerized by an oxidant that is free in the solution, and is in a free state. These free PANIs accumulate on the surface of carbon-based materials in large quantities. Even if the concentration of aniline is extremely low, some free PANIs will also be produced. As a result, irregular accumulation occurs on the surface of carbon-based materials, which is not conducive to the diffusion of ions and hinders charge transfer, which seriously affects the improvement of its cycle stability.

Method used

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  • Carbon-based/PANI composite electrode material for supercapacitor and preparation method of carbon-based/PANI composite electrode material
  • Carbon-based/PANI composite electrode material for supercapacitor and preparation method of carbon-based/PANI composite electrode material
  • Carbon-based/PANI composite electrode material for supercapacitor and preparation method of carbon-based/PANI composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Dissolve 0.571 g of ammonium persulfate (APS) in 50 mL of deionized water to obtain a clear solution; add 50 mg of 3DN-PC material to the aforementioned clear solution, and stir magnetically at room temperature for 24 h to obtain a black dispersion. Experiments show that reducing the concentration of APS will increase the particle size of polyaniline nanoparticles but reduce the amount.

[0041] (2) Suction-filter and wash the dispersion obtained above to obtain 3D N-PC with APS adsorbed.

[0042] (3) Dissolve 2733.5 μL of concentrated sulfuric acid in 50 mL of deionized water, and then divide it into two portions of 20 mL and 30 mL.

[0043] (4) Add 191.5 μL of aniline monomer to the above 20 mL of sulfuric acid solution, and dissolve it by ultrasonication for about 20 min to obtain a mixed solution containing aniline monomer, which is designated as mixed solution A, and placed in an ice bath at 0 °C Pre-cool in the machine.

[0044] (5) Transfer the product obta...

Embodiment 2

[0048] (1) 1.141 g of ammonium persulfate (APS) was dissolved in 50 mL of deionized water to obtain a clear solution; 50 mg of 3DN-PC material was added to the aforementioned clear solution, and magnetically stirred at room temperature for 24 h to obtain a black dispersion.

[0049] (2) The dispersion liquid obtained above was subjected to suction filtration and washing to obtain 3D N-PC with adsorbed APS.

[0050] (3) Dissolve 2733.5 μL of concentrated sulfuric acid in 50 mL of deionized water, and then divide it into two portions of 20 mL and 30 mL.

[0051] (4) Add 191.5 μL of aniline monomer to the above 20 mL of sulfuric acid solution, and dissolve it by ultrasonication for about 20 min to obtain a mixed solution containing aniline monomer, which is designated as mixed solution A, and placed in an ice bath at 0 °C Pre-cool in the machine.

[0052] (5) Transfer the product obtained in step (2) to a round-bottomed flask containing 30 mL of sulfuric acid solution, and perfo...

Embodiment 3

[0059] (1) 2.282 g of ammonium persulfate (APS) was dissolved in 50 mL of deionized water to obtain a clear solution; 50 mg of 3DN-PC material was added to the aforementioned clear solution, and magnetically stirred at room temperature for 24 h to obtain a black dispersion.

[0060] (2) The dispersion liquid obtained above was subjected to suction filtration and washing to obtain 3D N-PC with adsorbed APS.

[0061] (3) Dissolve 2733.5 μL of concentrated sulfuric acid in 50 mL of deionized water, and then divide it into two portions of 20 mL and 30 mL.

[0062] (4) Add 191.5 μL of aniline monomer to the above 20 mL of sulfuric acid solution, and dissolve it by ultrasonication for about 20 min to obtain a mixed solution containing aniline monomer, which is designated as mixed solution A, and placed in an ice bath at 0 °C Pre-cool in the machine.

[0063] (5) Transfer the product obtained in step (2) to a round-bottomed flask containing 30 mL of sulfuric acid solution, and perfo...

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Abstract

The invention discloses a carbon-based / PANI composite electrode material for a supercapacitor and a preparation method of the carbon-based / PANI composite electrode material. The composite electrode material comprises a three-dimensional nitrogen-containing porous carbon-based material and PANI nanoparticles uniformly deposited on the surface of the three-dimensional nitrogen-containing porous carbon-based material. The preparation method comprises the following steps of (1) dispersing an oxidant and a three-dimensional nitrogen-containing porous carbon-based material into deionized water to obtain uniform dispersion liquid; (2) performing suction filtration and washing to obtain a 3D N-PC material adsorbed with an oxidant; (3) preparing a mixed solution containing an aniline monomer and doped acid; (4) transferring the 3D N-PC material adsorbed with the oxidizing agent into an acid-doped aqueous solution; and (5) dropwise adding an aniline monomer-containing solution into the dispersion liquid containing the 3D N-PC material to obtain the three-dimensional nitrogen-containing porous carbon base / PANI composite material. The method is simple in process, mild in reaction condition andlow in preparation cost. According to the prepared composite material, the ordered accumulation of polyaniline on the surface of the three-dimensional carbon-based material is realized, and the composite material has high cycling stability and rate capability in charging and discharging processes.

Description

technical field [0001] The invention relates to a composite electrode material for a supercapacitor and a preparation method thereof, belonging to the technical field of new energy materials. Background technique [0002] Polyaniline (PANI) is a typical conductive polymer. Since the redox reaction occurs in the entire bulk phase of PANI during charge and discharge, it can exhibit superior theoretical specific capacitance and current density, and is widely used in Electrode materials for supercapacitors. However, a large number of experimental results show that PANI will undergo irreversible degradation and volume expansion during the charging and discharging process, which will lead to its poor cycle stability, thus limiting the wide application of PANI. [0003] Controlling the structure of polyaniline is the key to improving its cycling stability. At present, the common method to improve the cycling stability of PANI is graphene oxide (Amin Goljanian Tabrizi, Nasser Arsa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/24H01G11/32H01G11/48H01G11/86
CPCH01G11/26H01G11/24H01G11/32H01G11/48H01G11/86Y02E60/13
Inventor 王玮唐丽娟
Owner OCEAN UNIV OF CHINA
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