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Mixed type electrochemical capacitor

An electrochemical and capacitor technology, which is applied in the field of hybrid electrochemical capacitors, can solve the problems of low specific capacitance, poor cycle performance and conductivity, and affect the energy density of devices, so as to achieve high practical value, high power density and cycle stability , the effect of alleviating energy shortage

Inactive Publication Date: 2013-10-09
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the electric double layer capacitor materials represented by porous carbon materials have low specific capacitance, which affects the energy density of the overall device; metal oxides (such as ruthenium oxide, manganese oxide) and conductive polymers (such as polyaniline, polypyrrole) ) The Faraday capacitor material represented by it has high specific capacitance, but its cycle performance and conductivity are poor

Method used

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  • Mixed type electrochemical capacitor
  • Mixed type electrochemical capacitor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Preparation of aligned carbon nanotube arrays:

[0052] Put the Al foil into the tube furnace, under H 2 Under the protection of Ar mixed gas (volume ratio 1:9), the temperature was raised to 650 °C, and the ethanol solution of ferrocene (concentration: 0.075 mol / L) was passed through, and the aligned carbon nanotube arrays were directly grown on the Surface of Al foil.

[0053] (2) Preparation of positive pole piece:

[0054] Put the aligned carbon nanotube array obtained in step (1) as a working electrode into a mixed solution of aniline and sulfuric acid, the concentrations of aniline and sulfuric acid were 0.1 mol / L and 1 mol / L, respectively, and a platinum sheet was used as an auxiliary electrode. The Ag / AgCl electrode was used as the reference electrode. Electrochemical cyclic voltammetry was adopted. The voltage between the working electrode and the auxiliary electrode was -0.2~0.8 V. The scan rate was 50 mV / s and the number of cycles was 30 times. Perform...

Embodiment 2

[0060] (1) Preparation of aligned carbon nanotube arrays:

[0061] Put the Ti foil into a tube furnace at H 2 / Ar mixed gas (volume ratio 1:9), the temperature was raised to 800 °C, and the ethanol solution of ferrocene (0.05 mol / L) was passed through, and the aligned carbon nanotube array was directly grown on the The surface of the Ti foil.

[0062] (2) Preparation of positive pole piece:

[0063] The aligned carbon nanotube array obtained in step (1) was used as a working electrode and placed in a sodium sulfate solution with a concentration of 0.1 mol / L, a platinum sheet was used as an auxiliary electrode, and an Ag / AgCl electrode was used as a reference electrode. Current method, the current value is 0.1 A / cm 2 , the reaction cut-off voltage is 1.0 V, for Mn 2+ Manganese oxide is prepared by ion oxidation, and the manganese oxide is deposited on the surface of the aligned carbon nanotubes, then washed and dried, and the content of the manganese oxide is 47% by weight....

Embodiment 3

[0069] (1) Preparation of aligned carbon nanotube arrays:

[0070] Put Ni foam into the tube furnace, under H 2 Under the protection of Ar mixed gas (volume ratio 1:9), the temperature was raised to 800 °C, and the ethanol solution of ferrocene (concentration: 0.08 mol / L) was introduced, and the aligned carbon nanotube arrays were directly grown on the The surface of Ni foam.

[0071] (2) Preparation of positive pole piece:

[0072] Put the aligned carbon nanotube array obtained in step (1) as a working electrode into potassium permanganate with a concentration of 0.1 mol / L, heat to 70 °C, and react for 2 h to deposit manganese oxide on the aligned carbon nanotubes. The surface is then washed and dried, and the content of manganese oxide is 66% by weight.

[0073] (3) Preparation of negative pole piece:

[0074] Put the aligned carbon nanotube array obtained in step (1) as the working electrode into the mixed solution of pyrrole and sodium nitrate, the concentrations of an...

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Abstract

The invention relates to a mixed type electrochemical capacitor, in particular to a mixed type electrochemical capacitor with high-energy density based on directional carbon nanotubes. The mixed type electrochemical capacitor structurally comprises a positive electrode, a negative electrode, a separating membrane and electrolytes, wherein the separating membrane and the electrolytes are arranged between the positive electrode and the negative electrode. The mixed type electrochemical capacitor is characterized in that the positive electrode of the mixed type electrochemical capacitor is composed of a directional carbon nanotube array directly growing on a conductive substrate and manganese oxide or polyaniline composite materials; the negative electrode of the mixed type electrochemical capacitor is composed of a modified directional carbon nanotube array or a directional carbon nanotube array directly growing on the conductive substrate and polypyrrole composite materials; the electrolytes of the mixed type electrochemical capacitor are nonaqueous electrolytes. The mixed type electrochemical capacitor has energy density capable of being compared to a secondary battery, and meanwhile has high power density and cycling stability. The current problem of energy shortage can be eased, and the mixed type electrochemical capacitor has high practical value, wide market prospect and considerable economic and social benefits.

Description

technical field [0001] A hybrid electrochemical capacitor relates to a high energy density hybrid electrochemical capacitor based on aligned carbon nanotubes and the matching of positive and negative electrode materials and electrolyte in the electrochemical capacitor. Background technique [0002] Electrochemical Capacitor (EC), commonly known as supercapacitor (Supercapacitor), as a new type of chemical power supply, has a long service life (10 5 cycle), high specific power (1500W / kg), fast charging (for a few seconds), good low-temperature performance (minimum working temperature -50°C), good high-current discharge performance, large storage energy, and higher battery life Power density, higher energy density than traditional capacitors, is likely to develop into an efficient and practical energy storage device, so it has a very wide range of applications in transportation, energy, communications, power electronics, military defense, industrial production and other fields...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/38H01G11/54
CPCY02E60/13
Inventor 杨建红方岩高宏权
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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