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A kind of carbon-based/pani composite electrode material for supercapacitor and preparation method thereof

A technology for supercapacitors and composite materials, 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 Performance, low preparation cost, and simple preparation process

Active Publication Date: 2022-07-05
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of carbon-based/pani composite electrode material for supercapacitor and preparation method thereof
  • A kind of carbon-based/pani composite electrode material for supercapacitor and preparation method thereof
  • A kind of carbon-based/pani composite electrode material for supercapacitor and preparation method thereof

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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 but decrease the amount of polyaniline nanoparticles.

[0041] (2) The dispersion liquid obtained above was subjected to suction filtration and washing to obtain 3D N-PC adsorbed with APS.

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

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

[0...

Embodiment 2

[0048] (1) Dissolve 1.141 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.

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

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

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

[0052] (5) The product obtained in step (2) was transferred to a round-bottomed flask containing 30 mL of sulfuric acid solution, and magneticall...

Embodiment 3

[0059] (1) Dissolve 2.282 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.

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

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

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

[0063] (5) The product obtained in step (2) was transferred to a round-bottomed flask containing 30 mL of sulfuric acid solution, and magneticall...

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Abstract

The invention discloses a carbon-based / PANI composite electrode material for supercapacitors and a preparation method thereof. The composite electrode material includes 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 includes the following steps: (1) dispersing an oxidant and a three-dimensional nitrogen-containing porous carbon-based material into deionized water to obtain a uniform dispersion; (2) obtaining a 3D N-PC material adsorbed with an oxidant by suction filtration and washing (3) Prepare a mixed solution containing aniline monomer and doped acid; (4) Transfer the 3D N-PC material with adsorbed oxidant into the acid-doped aqueous solution (5) Add dropwise the solution containing aniline monomer The three-dimensional nitrogen-containing porous carbon-based / PANI composite material was obtained into the dispersion liquid containing the 3D N-PC material. The process method of the invention is simple, the reaction conditions are mild, and the preparation cost is low. The prepared composite material realizes the ordered accumulation of polyaniline on the surface of the three-dimensional carbon-based material, and has high cycle stability and rate capability during the charge-discharge process.

Description

technical field [0001] The invention relates to a composite electrode material for supercapacitors 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 the charge and discharge process, 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 cycling stability, thus limiting the wide application of PANI. [0003] Controlling the structure of polyaniline is the key to improve its cycling stability. At present, the common method to improve the stability of PANI cycle is to use graphene oxide (Amin Goljanian Tabr...

Claims

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Application Information

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Patent Type & Authority Patents(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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