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Asymmetric electrochemical capacitor and its preparation method

An electrochemical and asymmetric technology, applied in the field of capacitors, which can solve the problems of low specific capacitance of capacitors, low energy density of capacitors, and inability to form effective capacitances.

Active Publication Date: 2016-04-13
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the micropore specific surface area of ​​the high specific surface area activated carbon currently used cannot form an effective capacitance, which makes the energy density of the capacitor low, resulting in a low specific capacitance of the capacitor.

Method used

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  • Asymmetric electrochemical capacitor and its preparation method
  • Asymmetric electrochemical capacitor and its preparation method
  • Asymmetric electrochemical capacitor and its preparation method

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Experimental program
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preparation example Construction

[0033] Another object of the present invention is to provide the preparation method of above-mentioned asymmetric type electrochemical capacitor, such as figure 2 shown, including the following steps:

[0034] S1. Configure the metal oxide, the first conductive agent, and the first binder with a mass ratio of 80 to 93:2 to 10:5 to 10 as the positive electrode active material, and set the mass ratio to 80 to 93:2 ~10:5~10 graphene, the second conductive agent and the second binder are configured as the negative electrode active material;

[0035] S2. Coating the positive electrode active material on an aluminum foil and drying it to obtain a positive electrode; coating the negative electrode active material on a copper foil and drying it to obtain a negative electrode;

[0036] S3. Cut the positive electrode, negative electrode, and separator into required specifications, then cut them into required specifications, assemble them in the order of positive electrode / diaphragm / ne...

Embodiment 1

[0047] 1. Electrode preparation of asymmetric electrochemical capacitor:

[0048] positive electrode. Mix NiO with a mass ratio of 85:10:5, acetylene black conductive agent, and PVDF binder to make a positive electrode active material, coat the positive electrode active material on an aluminum foil, and bake it in a vacuum at 80°C for 12 hours to obtain a positive electrode ;

[0049] negative electrode. Graphene with a mass ratio of 85:10:5 (with a specific surface area of ​​400m 2 / g), acetylene black conductive agent, and PVDF binder are mixed to make a negative electrode active material, and the negative electrode active material is coated on a copper foil, and baked in a vacuum at 80° C. for 12 hours to obtain a negative electrode.

[0050] Wherein, the mass ratio of the positive electrode active material on the positive electrode to the negative electrode active material on the negative electrode is 1:1.

[0051] 2. Assembly of asymmetric electrochemical capacitors: ...

Embodiment 2

[0055] 1. Electrode preparation of asymmetric electrochemical capacitor:

[0056] positive electrode. PbO with a mass ratio of 80:10:10 2 , carbon nanotube conductive agent, and PVDF binder are mixed to make a positive electrode active material, and the positive electrode active material is coated on an aluminum foil, and baked in a vacuum at 80°C for 12 hours to obtain a positive electrode;

[0057] negative electrode. Graphene with a mass ratio of 80:10:10 (specific surface area of ​​700m 2 / g), a carbon nanotube conductive agent, and a PVDF binder are mixed to make a negative electrode active material, and the negative electrode active material is coated on a copper foil, and baked in a vacuum at 80° C. for 12 hours to obtain a negative electrode.

[0058] Wherein, the mass ratio of the positive electrode active material on the positive electrode to the negative electrode active material on the negative electrode is 1:2.

[0059] 2. Assembly of asymmetric electrochemica...

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Abstract

The invention belongs to the capacitor field, and particularly discloses an asymmetric electrochemical capacitor and a method for preparing the same. The asymmetric electrochemical capacitor comprises an anode and a cathode; materials of the anode comprise aluminum foil and positive active materials coated on the aluminum foil and composed of metallic oxide, first conductive agents and second conductive agents in a mass ratio range of (80-93):(2-10):(5-10) ; and materials of the cathode comprise copper foil and cathode active materials coated on the copper foil and composed of graphene, second conductive agents and second binding agents in a mass ratio range of(80-93):(2-10):(5-10). According to the asymmetric electrochemical capacitor, cathode materials are provided with a low potential platform, and the anode utilizes metallic oxide with a large specific surface area and good conductivity, so that internal resistance of the whole asymmetric electrochemical capacitor can be effectively decreased, and the asymmetric electrochemical capacitor can generate high specific capacitance.

Description

technical field [0001] The invention belongs to the field of capacitors and relates to an asymmetric electrochemical capacitor. The invention also relates to a preparation method of the asymmetric electrochemical capacitor. Background technique [0002] In the 1990s, the development of electric vehicles and the need for power pulse power supplies further stimulated research on electrochemical capacitors. At present, the specific energy of electrochemical capacitors is still relatively low, and the specific power of batteries is low. People are trying to solve this problem from two aspects: (1) When batteries and supercapacitors are used in combination, during normal operation, the batteries provide the required energy. The power; when starting or needing a large current discharge, it is provided by a capacitor. On the one hand, it can improve the shortcoming of the battery’s poor low-temperature performance; it can solve the application of pulse current with high power requ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042H01G9/045
CPCY02E60/13
Inventor 周明杰钟玲珑王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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