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Method for manufacturing asymmetric super capacitor

A technology for supercapacitors and manufacturing methods, which is applied in the manufacture of hybrid/electric double-layer capacitors, double-layer capacitors, electrolytic capacitors, etc., can solve problems such as poor dispersion of defects and poor conductivity, and achieve improved purity and utilization, improved stability, The effect of ultra-high energy density

Inactive Publication Date: 2015-01-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First, chemical vapor deposition (PECVD) is used as a means to directly deposit few-layer graphene on the current collector foam nickel, which fundamentally overcomes the shortcomings of graphene prepared by common chemical methods, such as many defects, poor dispersion and poor conductivity.

Method used

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  • Method for manufacturing asymmetric super capacitor
  • Method for manufacturing asymmetric super capacitor
  • Method for manufacturing asymmetric super capacitor

Examples

Experimental program
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preparation example Construction

[0044] The invention provides a method for preparing a supercapacitor with high energy density, high power density and long cycle life. First, the electrode material graphene and cobalt hydroxide are compounded by plasma enhanced chemical vapor deposition method and electrochemical deposition method, and cobalt hydroxide / graphene is used as the positive electrode material, potassium hydroxide / potassium ferricyanide mixed aqueous solution The positive electrode system is composed of the positive electrolyte; then the activated carbon electrode is prepared by spraying / scraping method, and the negative electrode is composed of activated carbon / carbon paper as the negative electrode material and potassium hydroxide / p-phenylenediamine mixed aqueous solution as the negative electrolyte system; the two-electrode system is connected through a selectively permeable membrane, so that the two electrodes can function independently, and then electrochemically test the new capacitor, the spe...

Embodiment 1

[0072] 1) Using PECVD equipment, heat up the metal base material in argon, with a flow rate of 20 sccm, a pressure of 200 Pa, a deposition temperature of 800° C., and a heating rate of 20° C. / min.

[0073] 2) When the temperature reaches the reaction temperature of 800°C, methane gas is introduced, and the gas ratio is CH 4 / Ar=20 / 80, the gas pressure is 400Pa.

[0074] 3) Turn on the RF power supply, the RF power is 200W, and the ionization time is 30min.

[0075] 4) After the reaction is over, continue to pass argon to room temperature, and take it out for use in the next step.

[0076] 5) The constant temperature water bath is maintained at a constant temperature of 45°C. Adjust the deposition potential to -0.9V, and perform electrochemical deposition in the three-electrode system according to the predetermined deposition amount in the experiment; after the electrolysis, turn off the constant voltage and constant current power supply, take out the working electrode, wash ...

Embodiment 2

[0082] Change the new mixed electrolyte in step 7) of Example 1 to the traditional potassium hydroxide electrolyte (that is, without the addition of potassium ferricyanide and p-phenylenediamine). Under constant current charge and discharge at a current density of 2A / g, the specific capacitance of the capacitor is 54.0F / g, the highest energy density is 16.9Wh / kg, and the corresponding power density is 1500W / kg.

[0083] According to the example of the above-mentioned invention, high-performance positive electrode system with cobalt hydroxide / graphene-potassium hydroxide / potassium ferricyanide and negative electrode system with activated carbon / carbon paper-potassium hydroxide / p-phenylenediamine can be prepared. A new type of asymmetric capacitor with an electrode system, the new type of asymmetric capacitor has the following characteristics:

[0084] 1) Graphene provides high specific surface area and high electrical conductivity, good stability, favorable electron transport, ...

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Abstract

The invention relates to a method for manufacturing an asymmetric super capacitor with a solid phase electrode material and liquid phase electrolyte which provide capacitance at the same time. The super capacitor has superhigh energy density, power density and circulating stability. The positive electrode is made of a cobaltous hydroxide / graphene composite electrode material, and the electrolyte is the mixed electrolyte of potassium hydroxide / potassium ferricyanide. The negative electrode is made of an activated carbon / carbon fiber paper electrode material, and the electrolyte is the mixed electrolyte of potassium hydroxide / p-phenylenediamine. The solid phase electrode material and liquid phase electrolyte synchronously and independently provide the capacitance. The asymmetric super capacitor can have high energy density, power density and circulating density under the high charging and discharging density. The energy density is 124.4 Wh / kg under the 2A / g charging and discharging current density, the corresponding power density is 2,000 W / kg, and specific capacitance of the capacitor hardly attenuates after 20,000 times of circulation.

Description

Technical field: [0001] Prepared and optimized the positive electrode material cobalt hydroxide / graphene, and explored the preparation process of the negative electrode material activated carbon, and obtained the cobalt hydroxide / graphene-potassium hydroxide / potassium ferricyanide positive electrode with high electrochemical performance system and activated carbon / carbon paper-potassium hydroxide / p-phenylenediamine negative electrode system. Based on the above work, a new type of asymmetric supercapacitor is assembled. On the one hand, the solid electrode and the liquid electrolyte provide pseudocapacitance at the same time, and the specific capacitance of the capacitor is greatly improved; on the other hand, the working potential window of the capacitor is also greatly improved by reasonably matching the asymmetric supercapacitor. The novel asymmetric capacitors we assembled exhibited ultra-high energy density, power characteristics, and cycle stability. Background techniq...

Claims

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Application Information

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IPC IPC(8): H01G11/84H01G11/86
CPCH01G11/00H01G11/84H01G11/86Y02E60/13
Inventor 郑伟涛赵翠梅邓霆王欣田宏伟张恒彬
Owner JILIN UNIV
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