Method for preparing electrodes of super capacitor based on nickel foam and products thereof

A supercapacitor and nickel foam technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid capacitor electrolytes, and hybrid/electric double layer capacitors, can solve problems such as affecting the performance of electrode materials, increasing costs, and complicating the preparation process, achieving high performance. Energy density, reduced raw material cost, excellent electrical effect

Inactive Publication Date: 2013-08-21
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, studies have shown that at present, in the process of preparing supercapacitor electrodes, it is often necessary to incorporate acetylene black or conductive graphite as a conductive agent, and at the same time incorporate polytetrafluoroethylene, polyvinylidene fluoride or similar materials as a binder, which not only makes The preparation process is complicated, the cost becomes higher, and it will also affect the performance of the electrode material itself; on the other hand, with the rise of electric vehicles and hybrid electric vehicles, under the premise of maintaining high power and long life of supercapacitors, the energy Density is becoming a research hotspot in supercapacitors

Method used

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  • Method for preparing electrodes of super capacitor based on nickel foam and products thereof
  • Method for preparing electrodes of super capacitor based on nickel foam and products thereof
  • Method for preparing electrodes of super capacitor based on nickel foam and products thereof

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preparation example Construction

[0044] Specifically, for the electrode preparation process of an asymmetric supercapacitor, the preparation method proposed by the present invention mainly includes the following steps:

[0045] First, the nickel foam is cleaned, and then soaked in an aqueous solution of graphene oxide with a mass concentration of 1 mg / ml to 10 mg / ml, thereby obtaining nickel foam deposited with graphene oxide;

[0046] Then, the nickel foam deposited with graphene oxide is used as the precursor material to make the positive and negative electrodes of the asymmetric supercapacitor respectively. The specific process is as follows:

[0047] The three-electrode method is used to perform constant voltage electrochemical reduction on the precursor material, wherein the nickel foam deposited with graphene oxide is used as the working electrode, the platinum electrode is used as the auxiliary electrode, and the saturated calomel electrode is used as the reference electrode, and the molar concentration...

Embodiment 1

[0064] Cut the nickel foam into a suitable size and wash it with glacial acetic acid, acetone, ethanol and deionized water for 10 minutes. Then soak the cleaned nickel foam into a graphene oxide solution with a concentration of 5 mg / mL, and the temperature of the system is controlled at 80 degrees. After about 10 minutes, take out the nickel foam and dry it. The scanning electron microscope pictures can be found in the attached figure 1 .

[0065] The nickel foam deposited with graphene oxide was subjected to constant voltage electrochemical reduction with a three-electrode method, the reduction potential was -1.5V, and the reduction time was 600s, and the nickel foam electrode deposited with graphene was obtained. In this process, the nickel foam deposited with graphene oxide was used as the working electrode, the platinum electrode was used as the counter electrode, the saturated calomel electrode was used as the reference electrode, and 0.5 mol / L sodium sulfate solution wa...

Embodiment 2

[0069]Cut the nickel foam into a suitable size and wash it with glacial acetic acid, acetone, ethanol and deionized water for 10 minutes. Then soak the cleaned nickel foam into a graphene oxide solution with a concentration of 1 mg / mL, and the temperature of the system is controlled at 40 degrees. After about 30 minutes, take out the nickel foam and dry it.

[0070] The nickel foam deposited with graphene oxide was subjected to constant voltage electrochemical reduction with a three-electrode method, the reduction potential was -1.0V, and the reduction time was 800s, and the nickel foam electrode deposited with graphene was prepared. In this process, the nickel foam deposited with graphene oxide was used as the working electrode, the platinum electrode was used as the counter electrode, the saturated calomel electrode was used as the reference electrode, and 1 mol / L sodium sulfate solution was used as the electrolyte. Next, soak the nickel foam deposited with graphene into th...

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Abstract

The invention discloses a method for preparing electrodes of a dissymmetric super capacitor based on nickel foam. The method comprises the steps: washing the nickel foam, soaking the nickel foam into a graphene oxide aqueous solution to obtain nickel foam in which graphene oxide deposits, serving the nickel foam in which the graphene oxide deposits as precursor materials, and respectively adopting a three-electrode method for preparaing a positive electrode and a negative electrode of the dissymmetric super capacitor, wherein the positive electrode is composed of composite materials of graphene, a carbon nanometer tube and the nickel foam, and the negative electrode is composed of composite materials of graphene, manganese dioxide and the nickel foam. The invention further discloses some other methods for preparing the electrodes of the super capacitor based on the similar principle, and products which correspond to the methods. By means of the methods and the products, respective high-ratio capacitance characteristics of the composite materials are fully played, and energy density of the super capacitor is improved. In addition, usage of various combined reagents can be avoided, and accordingly large-batch industrial production is conducted in a mode of convenient control, low cost and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and more specifically relates to a method for preparing supercapacitor electrodes based on nickel foam and products thereof. Background technique [0002] Supercapacitor is a high-energy and green energy storage device with performance between batteries and traditional capacitors. Because of its advantages such as high power density, fast charge and discharge speed, long cycle life and wide operating temperature range, it is widely used in electric vehicles, It has been widely used in many fields such as communication and electronic consumption. According to different energy storage mechanisms, supercapacitors can be divided into electric double layer capacitors and faraday quasi capacitors, in which electric double layer capacitors use the interface electric double layer capacitance formed between electrodes and electrolytes to store energy, Faraday quasi capacitors are in On the two-di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/30H01G11/56
CPCY02E60/13
Inventor 王帅张哲野肖菲
Owner HUAZHONG UNIV OF SCI & TECH
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