Method for producing manganese dioxide electrode of supercapacitor

A supercapacitor and manganese dioxide technology, applied in the field of electrochemistry, can solve the problem of difficult to obtain electrode materials with high power density and high energy density, the effective design of the surface and internal microstructure of difficult electrode materials, and the contact between electrode active materials and current collectors Defective and other problems, to achieve high specific volume characteristics, improve processing performance, reduce the effect of ohmic polarization

Active Publication Date: 2013-07-31
CENT SOUTH UNIV
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Problems solved by technology

However, most of the research is to first prepare the above-mentioned transition metal oxides into powder granular materials, and then mix these powder materials with binders and coat them on the current collector to prepare electrodes, which is easy to cause electrode active materials. Poor contact with the current collector affects the charge and discharge performance of the electrode
In addition, since the internal structure of the electrode material and its interface characteristics with the electrolyte play a crucial role in the performance of the capacitor, it is difficult to prepare the powder electrode material by chemical precipitation method, hydrothermal method, etc. It is difficult to obtain electrode materials with high power density and high energy density through effective design of structure; it is difficult to do element doping for electrode materials prepared by conventional electrolytic manganese dioxide production methods, and the specific capacitance of prepared electrode materials can only reach 200F.g -1 about

Method used

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  • Method for producing manganese dioxide electrode of supercapacitor

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Embodiment 1

[0031] Configure MnSO separately 4 .H 2 O and NiSO 4 .7H 2 O aqueous solution, according to the molar ratio of nickel to disodium edetate is 1:1 to NiSO 4 Add disodium ethylenediamine tetraacetate into the solution and fully stir to form a uniform and transparent solution. Mix the prepared two solutions containing manganese salt and nickel salt, add ammonium sulfate and sodium lauryl sulfate to the mixed solution after mixing, and dissolve after adding water; the concentration of each component is: the concentration of manganese ions is 0.5mol / L, ammonium sulfate concentration is 1.2mol / L, nickel ion concentration is 0.025mol / L. Adjust the pH value of the solution to 5 with ammonia water, continue to stir for 60 minutes and set aside.

[0032] Cut the 304 stainless steel foil into an area of ​​4×1cm 2 The stainless steel belt is used as a current collector, and the current collector is ultrasonically washed with 10% sulfuric acid aqueous solution and acetone, and finally...

Embodiment 2

[0035] The operation process is the same as in Example 1, except that the concentration of manganese sulfate used is 0.8mol / L, and the soluble alloy component salt is CoSO 4 .7H 2 O, the complexing agent is sodium citrate, the molar ratio of cobalt to sodium citrate is 1:5, the concentration of ammonium sulfate is 0.9mol / L, and the concentration of cobalt ion is 0.016mol / L. Adjust the pH of the solution to 7 with ammonia. with NH 4 F0.1%, water 5% ethylene glycol solution is used as the electrolyte for anodic oxidation treatment, the voltage of the constant pressure oxidation tank is 80V, the measured cobalt content in the alloy coating is 11%, and the specific capacitance of the electrode active material is 381F / g .

Embodiment 3

[0037] The operation process is the same as in Example 1, except that the concentration of manganese sulfate used is 0.8mol / L, and the soluble alloy component salt is AgNO 3 , the complexing agent is NaCN, the molar ratio of silver to NaCN is 1:10, the Ag in the electroplating solution + The concentration is 0.02mol / L. Adjust the pH of the solution to 7 with ammonia. with NH 4 CL0.5%, water 5% ethylene glycol solution is the electrolyte for anodic oxidation treatment, the constant voltage oxidation cell voltage is 5V, with 0.1mA / cm 2 Charge and discharge at a constant current for 10 times, the measured silver content in the alloy coating is 4%, and the specific capacitance of the electrode active material is 437F / g.

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Abstract

A method for producing a manganese dioxide electrode of a supercapacitor is characterized in that the production process of the electrode comprises the following steps of: firstly, co-depositing a manganese alloy coating on the surface of an electrode current collector by electrochemistry; and secondly, carrying out anodic oxidation treatment on the electrode with the manganese alloy coating to obtain the manganese dioxide electrode. According to the method disclosed by the invention, the uniform distribution of alloy elements inside the electrode is realized by electrochemistry co-deposition so as to increase the electronic conductivity of the alloy elements in the anodic oxidation and charging and discharging process. Due to the utilization of anodic oxidation, on one hand, manganese in the alloy layer is converted into a manganese dioxide material with the electrochemical activity; and meanwhile, pore path structures can be constructed on the surface and the inside of the produced electrode, and so that the solid phase mass transfer characteristic and the electrochemical reaction activity of materials are improved and the electrode with high specific capacitance is obtained.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a method for preparing manganese dioxide supercapacitor electrodes. technical background [0002] Supercapacitor is a new concept energy storage device between batteries and traditional electrostatic capacitors. Compared with traditional electrostatic capacitors such as aluminum electrolytic capacitors, supercapacitors have higher specific capacitance, and the energy density that can be stored is traditional electrostatic capacitors Compared with batteries, supercapacitors have greater power density, and have the characteristics of high charge and discharge efficiency and long cycle life. Due to the many advantages above, the development of supercapacitor technology has been widely valued by academia, industry and military departments, and it is gradually being used as a backup power supply for electronic instruments, rockets, missiles, artificial satellites,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86
CPCY02E60/13
Inventor 陈亚王佳伟陈白珍石西昌杨喜云徐徽
Owner CENT SOUTH UNIV
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