Supercapacitor based on polypyrrole / manganese dioxide / carbon cloth and manufacturing method thereof

A supercapacitor, manganese dioxide technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor electrolytes, etc., can solve the problems of easy dissolution or corrosion of electrode active materials, complex production process, and high toxicity of materials. , to achieve the effect of improving electrochemical performance, wide range of sources and high energy density

Inactive Publication Date: 2014-06-11
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the existing problems of supercapacitors such as complex manufacturing process, high cost of raw materials, high toxicity of materials used, poor flexibility, and easy dissolution or corrosion of electrode active materials in electrolytes, etc., and propose a Excellent performance, low cost, environmentally friendly, simple preparation, supercapacitor with promotion value and preparation method thereof

Method used

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  • Supercapacitor based on polypyrrole / manganese dioxide / carbon cloth and manufacturing method thereof
  • Supercapacitor based on polypyrrole / manganese dioxide / carbon cloth and manufacturing method thereof
  • Supercapacitor based on polypyrrole / manganese dioxide / carbon cloth and manufacturing method thereof

Examples

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preparation example Construction

[0052] see figure 2 , shows the preparation method of the supercapacitor according to one embodiment of the present invention, which includes the following steps:

[0053] In step (a), two carbon cloths were taken for cleaning respectively, and were cleaned in sequence with acetone, alcohol and deionized water under ultrasonic waves, and finally dried in an oven to obtain a clean and dry carbon cloth as a current collector;

[0054] In step (b), use a mixed solution of sulfuric acid and manganese sulfate as the electrodeposition solution, connect one of the carbon cloths to the copper wire with silver paste, inject the mixed solution of sulfuric acid and manganese sulfate into the electrolytic cell, and use electrochemical depositing nanostructured manganese dioxide;

[0055] In step (c) and step (d), a mixed solution of sodium perchlorate and pyrrole monomer is used as the electropolymerization solution, the electropolymerization solution is injected into the electrolytic c...

Embodiment 1

[0063] 1) Preparation of electrode materials

[0064] Take two carbon cloths with a thickness of about 274 microns and an area of ​​about 1.5 square centimeters, clean them first, then use acetone, alcohol and deionized water to wash them under ultrasonic conditions for 15 minutes, and finally dry them in an oven to obtain a clean dry carbon cloth. The above-mentioned carbon cloth was cleaned with oxygen plasma for 10 minutes to carry out surface hydrophilic treatment. Connect the electrodes to one end of the carbon cloth with silver paste. Then put the carbon cloth into the electrolytic tank, inject a mixed solution of sulfuric acid and manganese sulfate with a concentration of 0.2 moles per liter into the tank, and use the constant current method to electrochemically deposit for 75 minutes, and the current density is 0.5mA cm -2 , depositing nanostructured manganese dioxide on carbon cloth.

[0065] Pour out the liquid in the electrolytic tank, inject 0.2 moles per liter ...

Embodiment 2

[0083] 1) Preparation of electrode materials

[0084] In this example, the preparation of the electrode material is different from Example 1 in that the electrochemical deposition time of manganese dioxide is 30 minutes; the electropolymerization time of pyrrole is 0.5 minutes, and the rest are the same.

[0085] 2) Assembly of supercapacitor

[0086] together with the examples.

[0087] 3) Performance testing of supercapacitor electrode materials

[0088] Figure 5 The electrode material performance test of this embodiment is included. Figure 5 In (a), after 30 minutes of electrochemical deposition of manganese dioxide on carbon cloth, when the discharge current density is 0.2mA cm -2 , the measured surface capacitance is 0.26F cm -2 , when the discharge current density increases to 10mA cm -2 , the measured surface capacitance is 0.11F cm -2 . Figure 5 (b), when the discharge current density increases 50 times, that is, from 0.2mA cm -2 increased to 10mA cm -2 , ...

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Abstract

The invention discloses a supercapacitor and a manufacturing method of the supercapacitor. The supercapacitor comprises a positive electrode, a solid electrolyte and a negative electrode. The solid electrolyte is located between the positive electrode and the negative electrode and isolates the positive electrode from the negative electrode, and the solid electrolyte evenly permeates into a hole structure of the positive electrode and a hole structure of the negative electrode. The positive electrode is made of polypyrrole/nano-structured manganese dioxide composite materials. The manufacturing method of the supercapacitor comprises the steps that clean and dry carbon cloth serves as a current collector; a sulfuric acid and manganese sulfate mixed solution is used as an electro-deposition solution, and electrochemical deposition is performed on nano-structured manganese dioxide on the carbon cloth; a sodium perchlorate and pyrrole monomer mixed solution serves as an electro-polymerization solution, electro-polymerization is performed on a polypyrrole film on the surface of the nano-structured manganese dioxide, and the positive electrode is prepared; a phosphoric acid/polyvinyl alcohol electrolyte is prepared; the negative electrode is prepared through active carbon/ graphite materials; the positive electrode and the negative electrode are assembled into the supercapacitor by using the prepared phosphoric acid/polyvinyl alcohol electrolyte.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and more specifically relates to a supercapacitor based on polypyrrole / manganese dioxide / carbon cloth and a preparation method thereof. Background technique [0002] As a new type of energy storage device, supercapacitors have attracted great attention due to their characteristics of high power density, fast charge and discharge, long cycle life and safety in use. However, the disadvantage of relatively low energy density limits its application potential, therefore, the improvement of the energy density of supercapacitors is of great importance. Improving the energy density of supercapacitors can be achieved by increasing the specific capacitance of supercapacitors and increasing the operating voltage range of supercapacitors. In order to achieve the purpose of increasing the energy density of supercapacitors, on the one hand, a lot of research work uses electrode material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/48H01G11/38H01G11/56H01G11/68H01G11/84
CPCY02E60/13
Inventor 高义华陶家友刘逆霜
Owner HUAZHONG UNIV OF SCI & TECH
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