Carbon porous electrode preparing method

Abstract

The invention provides a novel carbon porous electrode preparing method. According to the method, a simple preparing technology is realized while the excellent performance of a carbon porous electrode is guaranteed. The carbon porous electrode preparing method comprises the steps that the surface of a current collector is coated with an electrode material containing carbon materials, binders and conductive agents, drying is conducted, and then an electrode plate in a specified thickness is formed; carbonizing treatment is conducted on the electrode plate at a temperature higher than or equal to 400 DEG C in an inert atmosphere, and then the carbon porous electrode is formed. By the adoption of the method, the obtained carbon porous electrode is better is conductive performance, resistance among carbon granules is reduced, ohmic drop on the carbon electrode in usage is reduced, actual working performance of the electrode is improved, the structural strength of the obtained carbon porous electrode is high, and the effective reaction area of the carbon electrode material is increased.

Description

technical field [0001] The invention belongs to the field of electrochemical technology, in particular to the electrochemical technology using carbon porous electrodes. The invention relates to a method for preparing a carbon porous electrode, in particular to a method for preparing a carbon porous electrode by using carbon with a high specific surface area. Background technique [0002] Carbon electrodes are commonly used electrodes in electrochemical technology. Carbon electrodes are used in many electrochemical technologies and devices, such as capacitors, electrosorption devices and other technologies and devices. Carbon electrodes have relatively stable electrochemical properties and are not easily oxidized or reduced. Moreover, carbon materials are generally low in cost and have many applications in industry. In practical applications, the carbon electrode is generally in the form of a carbon porous electrode (also called a porous carbon electrode), which has a high...

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Problems solved by technology

The disadvantage of this method is that the binder components remain in the carbon porous electrode, and these binders are usually organic polymer substances, which will be adsorbed on the surface of the carbon material, hindering the interaction between the carbon material and the electrolyte. contact; for activated carbon carbon materials, the remaining binder substances will still exist in the pores of the activated carbon, thereby greatly reducing the surface area and pore volume of the activated carbon material, and reducing the performance of the activated carbon material during the electrode operation; at the same time, almost The non-conductive binder is between the carbon material particles and the carbon material particles and the current collector, which hinders the transfer of electrons between the carbon material and the current collector, and reduces the electronic conductivity of the carbon porous electrode; at the same time, for some bonding During the long-term use of the agent, there will be slow dissolution or failure, and the electrode strength will gradually decrease during long-term use.

This method requires press equipment, and because the binder component remains in the electrode, it has the same disadvantages as the first carbon porous electrode preparation method: the electrical conductivity of the electrode is reduced, and the effective area and pores of the carbon material are reduced. Allow

The disadvantage of this method is that (1) the process is relatively complicated, and the electrode forming process requires the first step to the mold heating process and the electrode hot pressing process; mold heating and mold pressurization equipment are required, which increases manufacturing costs; ( 2) Although the carbonization and sintering step can adopt the batch sintering of the pole pieces, which has high efficiency; but considering the control of the thickness of the pole pieces, the mold hot pressing production method is generally used in large-scale and industrial production, and the general efficiency is low, especially It is difficult to prepare large-scale carbon porous electrodes (for example, the length exceeds 1m and the width exceeds 0.5m)

Because this step requires a large-sized mold, and the mold pressing process involves steps such as uniform distribution, hot pressing, and demoulding, the production efficiency is low; (3) In actual hot pressing operations, powder and mold adhesion often occur, resulting in Decreased yield and reduced production efficiency