Process method for preparing electrodes of molten carbonate fuel cell by use of wet method

Abstract

The invention discloses a process method for preparing electrodes of a molten carbonate fuel cell by use of a wet method. The method comprises the following steps: stirring and mixing carbonyl nickel powder and an adhesion agent solution into slurry, so that nickle powder can be effectively adhered and filled on a supporting body, thus the compactness of the electrodes can increased; coating a nickle powder slurry on the supporting body at a certain thickness by virtue of a doctor blade; and then rolling by virtue of a roller shaft, thus the compactness and intensity of the electrodes are increased effectively, and the surfaces of the sintered electrodes are compact and flat, and have self-supporting capability. The supporting body also can play a role of a collector electrode in the cell, the power generation performance of the cell is ensured greatly, thus according to the method, ball milling for a long time is not required, an organic solvent is not required to be used, simultaneously holes on the surfaces of the prepared electrodes are distributed uniformly, and the porosity is high, the phenomenon of nickle power dropping does not exists, and the favorable performances of the electrodes are ensured; and in addition, the process and the method are simple and feasible, are low in manufacturing cost, and are very suitable for mass continuous production of the electrodes used for molten carbonate fuel cells.

Description

technical field [0001] The invention belongs to the technical field of molten carbonate fuel cell electrodes, and in particular relates to a process method for wet preparation of molten carbonate fuel cell electrodes. Background technique [0002] Molten carbonate fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy by electrochemical reaction without combustion. It has the advantages of high power generation efficiency, low pollutant emission and modular arrangement. It is the future One of the power generation forms of distributed clean power plants. [0003] The basic unit of a molten carbonate fuel cell consists of a cathode, an electrolyte, and an anode, and one of the key technologies restricting the high-power and high-efficiency power generation of a molten carbonate fuel cell is how to make a large-area, high-performance, and meet the porosity requirements. cathode and anode. [0004] After searching the ...

AI Technical Summary

Problems solved by technology

The preparation equipment required in this process is very expensive, and the production time is also long. Especially the use of organic solvents will pose certain hazards to the environment and operators. In addition, the electrodes prepared by the tape casting method have no support body, and the prepared electrodes are at high temperature. lower strength under conditions

Chinese Patent No. CN1761092A is a dry method for preparing molten carbonate fuel cell electrodes. The specific method is to mix nickel carbonyl powder and binder together and roll the powder on the punching machine after rolling. The raw substrate is obtained on the porous nickel substrate, and then the raw substrate is sintered in a sintering furnace to obtain the cathode and anode. Although the process is simple and the processing cost is low, it takes a lot of time to roll the dry powder and the support body together. The uneven distribution of dry powder in the support body will cause the place with too much dry powder to be rolled into a mirror surface, and the place with less dry powder has insufficient rolling force and is easy to drop powder. On the one hand, the hole distribution of the electrode made is uneven. Too much force will cause the porosity of the electrode to be greatly reduced