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Three asymmetric solid-state electrochemical capacitors constructed through nanometer copolyaniline and activated carbon

A technology of copolyaniline and activated carbon, applied in the direction of hybrid capacitor electrodes, etc., to ensure the effect of cycle stability and high-quality specific capacitance

Inactive Publication Date: 2017-04-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Three asymmetric solid-state electrochemical capacitors constructed through nanometer copolyaniline and activated carbon
  • Three asymmetric solid-state electrochemical capacitors constructed through nanometer copolyaniline and activated carbon
  • Three asymmetric solid-state electrochemical capacitors constructed through nanometer copolyaniline and activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: Preparation of positive and negative electrodes with matching loading

[0050] Preparation of positive electrode dispersion: Put sulfonated copolyaniline, conductive agent carbon black and binder N-ethylaniline / aniline copolymer in a ball mill at a weight ratio of 80 / 10 / 10, and add an appropriate amount of 1-methyl-2-pyrrolidone After grinding, ultrasonic dispersion is carried out, and a blended dispersion with a weight concentration of about 2 wt% is prepared for use.

[0051] Preparation of negative electrode dispersion: mix the activated carbon, conductive carbon black and the binder SBR and CMC in a weight ratio of 80 / 10 / 6 / 4, add an appropriate amount of high-purity water and stir vigorously for 3 hours to prepare a 2wt% blended dispersion for use.

[0052] The effective area of ​​cut 316L stainless steel mesh is 1×1cm 2 After cleaning, insert the positive electrode and negative electrode dispersion liquids into the square grids. After being coated with a certa...

Embodiment 2

[0060] Example 2: Construction and electrochemical performance of three asymmetric supercapacitors

[0061] Add 1g of concentrated sulfuric acid (98% by volume) and 1g of PVA to 10ml of deionized water, stir and dissolve vigorously at 90℃ for 1h to obtain PVA-H 2 SO 4 The gel is ready for use. Similarly, 1g of sodium sulfate powder and 1g of CMC are added to 10ml of deionized water, and the solution is stirred vigorously at 90℃ for 1h to obtain CMC-Na 2 SO 4 The gel is ready for use. The sulfonated copolyaniline cathode in Example 1 is immersed in PVA-H 2 SO 4 Gel, activated carbon negative electrode immersed in CMC-Na 2 SO 4 Gel, soak for 15 minutes to make the electrode material fully infiltrated, and at the same time the cellulose membrane is in 1M Na 2 SO 4 Soak in the solution for 15 minutes. Then, the positive electrode impregnated with electrolyte gel, the cellulose separator and the negative electrode impregnated with another electrolyte gel are stacked together in order ...

Embodiment 3

[0070] Example 3: Ragone curve of three asymmetric supercapacitors

[0071] In order to investigate the rate performance of the three asymmetric supercapacitors, the three asymmetric supercapacitors in Example 2 were tested by changing the current density under four potential windows to test their CC charging and discharging performance, and the CC charging and discharging performance was tested by formula (3)--( 5) Calculate the energy density and power density, and plot the power density as the abscissa and the energy density as the ordinate to obtain 4 Ragone curves under 4 potential windows. See details Figure 8 . It can be seen that under the fixed potential window, increasing the current density, the power density obviously increases, while the energy density is slightly reduced, indicating that the three asymmetric supercapacitors have better rate performance.

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Abstract

The invention relates to three asymmetric solid-state electrochemical capacitors constructed through nanometer copolyaniline and activated carbon. Sulfonated copolyaniline serves as a positive electrode active material, and the activated carbon serves as a negative electrode active material. A positive electrode is soaked in positive electrolyte gels to form a positive electrolyte gel layer; the positive electrolyte gel layer is an anode matrix with positive electrolyte being dissolved therein; the positive electrolyte is an inorganic acid; and the anode matrix is selected from polyvinyl alcohol or polyvinylpyrrolidone. A negative electrode is soaked in negative electrolyte gels to form a negative electrolyte gel layer; the negative electrolyte gel layer is a cathode matrix with negative electrolyte being dissolved therein; the negative electrolyte is neutral salt; and the cathode matrix is selected from carboxymethylcellulose, potassium polyacrylate or polyethylene oxide. Compared with the prior art, the capacitors greatly suppress electrochemical migration and effectively ensure cycling stability of the capacitors, and give play to performance advantages of a pseudocapacitor material and a electrical double-layer capacitor material to the maximum degree.

Description

Technical field [0001] The invention relates to an electrochemical capacitor, in particular to a three-asymmetric solid electrochemical capacitor constructed by nano-copolyaniline and activated carbon. Background technique [0002] With the development of science and technology, smart wearable devices, ultra-thin mobile phones and other smart technologies have gradually become possible, and new requirements have been put forward for energy storage materials. Supercapacitors with high specific capacity, power density and cycle life are a new type of green and clean energy storage material, which has great application prospects. [0003] Polyaniline materials have become one of the most commonly used electrode materials for supercapacitors due to their excellent electrical conductivity, ease of preparation and environmental stability. (Chellachamy Anbalagan, A.; Sawant, S.N. Brine Solution-Driven Synthesis of Porous Polyaniline for Supercapacitor Electrode Application. Polymer, 2016...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/34H01G11/36H01G11/48
CPCY02E60/13H01G11/48H01G11/30H01G11/34H01G11/36
Inventor 黄美荣张露薇李新贵
Owner TONGJI UNIV
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