A kind of method for preparing manganese dioxide supercapacitor electrode

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,...

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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

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