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High-specific-capacitance manganese-dioxide conducting polymer composite electrode material with core-shell structure and manufacturing method thereof

A technology of conductive polymer and manganese dioxide, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of limiting the practical application of supercapacitor electrode materials, poor cycle stability, and difficulty in meeting demands, and achieves Good cycle stability, improved conductivity, and high specific capacitance

Inactive Publication Date: 2013-06-12
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor conductivity of manganese dioxide, only the material on the electrode surface participates in energy storage; therefore, the actual specific capacitance of manganese dioxide is low (100-200F / g), which is difficult to meet its needs in practical applications
[0003] In recent years, a kind of electrode material mixed with conductive polymer and manganese dioxide has been invented. This mixed electrode material has high conductivity and specific capacitance value, but poor cycle stability, which limits its application in supercapacitor electrodes. Practical Applications in Materials
So far, no example has been found to control the micro-nano structure of the composite electrode material by adjusting the pH value during the reaction, so that the composite electrode material has high specific capacitance and good cycle stability.

Method used

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  • High-specific-capacitance manganese-dioxide conducting polymer composite electrode material with core-shell structure and manufacturing method thereof
  • High-specific-capacitance manganese-dioxide conducting polymer composite electrode material with core-shell structure and manufacturing method thereof
  • High-specific-capacitance manganese-dioxide conducting polymer composite electrode material with core-shell structure and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1. Preparation of a core-shell structure composite electrode material with manganese dioxide nanotubes as the core and polypyrrole as the shell.

[0034] Dissolve 0.307g of potassium permanganate and 0.65ml of concentrated hydrochloric acid in 35ml of distilled water, and conduct a hydrothermal reaction at 140° C. for 12 hours in a 50ml hydrothermal kettle, thereby obtaining manganese dioxide nanotubes. Disperse 150mg of manganese dioxide nanotubes into 60ml of 0.01M sulfuric acid and stir slowly at 25°C. Another 100 μL of pyrrole monomer was dispersed into 40 ml of 0.01M sulfuric acid, and the pyrrole solution was quickly added to the manganese dioxide dispersion, and reacted at 25°C for 180mins to obtain a core-shell structure manganese dioxide-polypyrrole composite electrode material.

[0035] Electrochemical tests show that when the scan rate is 1mV / s, the specific capacitance of this core-shell structure manganese dioxide polypyrrole composite electrode ...

Embodiment 2

[0036] Example 2. Preparation of a core-shell structure composite electrode material with manganese dioxide nanospheres as the core and poly(3,4-ethylenedioxythiophene) as the shell.

[0037]Dissolve 0.5 g of potassium permanganate and 2 ml of concentrated sulfuric acid in 70 ml of distilled water, and conduct a hydrothermal reaction at 180° C. for 12 hours in an 80 ml hydrothermal kettle, thereby obtaining manganese dioxide nanospheres. Disperse 50mg of manganese dioxide nanospheres into 30ml of 0.001M hydrochloric acid, and stir slowly at 25°C. Disperse 50 μL of 3,4-ethylenedioxythiophene monomer into 70 ml of 0.001M benzoic acid, quickly add the 3,4-ethylenedioxythiophene dispersion into the manganese dioxide dispersion, and react at 25°C After 180 mins, the core-shell structure manganese dioxide poly(3,4-ethylenedioxythiophene) composite electrode material was obtained.

[0038] Electrochemical tests show that when the scan rate is 1mV / s, the specific capacitance of this...

Embodiment 3

[0039] Example 3. Preparation of a core-shell composite electrode material with manganese dioxide nanowires as the core and polyaniline as the shell.

[0040] Dissolve 0.307g of potassium permanganate and 0.65ml of concentrated nitric acid in 35ml of distilled water, and conduct a hydrothermal reaction at 140° C. for 12 hours in a 50ml hydrothermal kettle, thereby obtaining manganese dioxide nanowires. Disperse 150mg of manganese dioxide nanowires into 80ml of 1M naphthalene disulfonic acid and stir slowly at 25°C. Disperse 100 μL of aniline monomer into 20 ml of 1M acetic acid, quickly add the aniline solution into the manganese dioxide dispersion, and react at 25°C for 180mins to obtain a core-shell structure manganese dioxide-polyaniline composite electrode material.

[0041] Electrochemical tests show that when the scan rate is 1mV / s, the specific capacitance of this core-shell structure manganese dioxide polypyrrole composite electrode material can reach 400F / g; cycle 100...

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Abstract

The invention discloses a manganese-dioxide conducting polymer composite electrode material with a core-shell structure. The manganese-dioxide conducting polymer composite electrode material adopts a manganese-dioxide nano material as a core, adopts conducting polymer as a shell and is a composite nano material with the core-shell structure; the manganese-dioxide nano material is nano balls, nano rods, nano wires or nano tubes; and polyaniline, polypyrrole, polythiophene or poly(3,4-ethylenedioxythiophene) is used as the conducting polymer of the shell, the mass fraction of the manganese dioxide in the composite material is 5-95%, and the mass fraction of the conducting high polymer is 95-5%. The manganese-dioxide conducting polymer composite electrode material disclosed by the invention has the advantages that due to the conducting polymer component, the conductivity of the composite material is increased, and the migration rate of electrons in the charging and discharging process are accelerated, so that the specific capacitance of the composite electrode material is increased; the nano manganese dioxide plays a role in a skeleton, so that the damage of the microstructure of the conducting polymer in the charging and discharging process is avoided, and the cyclic life of the electrode material is greatly prolonged; and the conducting polymer and the nano manganese dioxide both play roles in storing charges. The invention discloses a manufacturing method of the electrode material.

Description

technical field [0001] The invention relates to a core-shell structure manganese dioxide conductive polymer electrode material, in particular to a supercapacitor electrode material with high specific capacitance and cycle stability. Background technique [0002] Supercapacitor is a new type of energy storage device with performance between dielectric capacitor and battery. The device has the advantages of fast charge and discharge rate, large specific capacity, and long cycle life. It is widely used in portable electronic equipment, hybrid vehicles and other fields. . Due to the advantages of high theoretical capacitance, low cost, and environmental friendliness, MnO2 has attracted great attention as an electrode material for supercapacitors. However, due to the poor conductivity of manganese dioxide, only the material on the electrode surface participates in energy storage; therefore, the actual specific capacitance of manganese dioxide is low (100-200F / g), which is diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/86
Inventor 陆云姚为周晖
Owner NANJING UNIV
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