High-strength molten carbonate fuel cell electrode and preparation method thereof

Abstract

The invention discloses a high-strength molten carbonate fuel cell electrode and a preparation method thereof, and belongs to the technical field of power generation. The high-strength molten carbonate fuel cell electrode adopts foamed nickel with a certain thickness as a base material, the strength of the foamed nickel is enhanced through hot pressing and thinning, the porosity of the foamed nickel base material is improved through punching, gaps between nickel wires of the foamed nickel are fully filled with electrode slurry with low solid content, and the molten carbonate fuel cell electrode with the consistent porosity is formed through tape casting of electrode slurry with high solid content. The prepared electrode is uniform in surface pore distribution and high in porosity, and has higher strength due to the support body, so that the good performance of the electrode in the discharge process is ensured. By adopting the electrode preparation method disclosed by the invention, the flatness, high porosity and strength of the electrode are ensured, and the assembly performance and discharge performance of the molten carbonate fuel cell stack are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of power generation, and relates to a high-strength molten carbonate fuel cell electrode and a preparation method thereof. Background technique [0002] 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. [0003] After searching the literature of the prior art, it is found that there are roughly several preparation methods. One is to prepare the molten carbonate fuel cell cathode nickel plate through a non-water-based casting process. Specifically, nickel powder is added to an organic solvent, dispersed Agent, binder and defoaming agent are ball-milled for a long time to form a slurry, and then the required electrode is obtained thro...

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Problems solved by technology

[0003] After searching the literature of the prior art, it is found that there are roughly several preparation methods. One is to prepare the molten carbonate fuel cell cathode nickel plate through a non-water-based casting process. Specifically, nickel powder is added to an organic solvent, dispersed Agent, binder and defoaming agent are ball-milled for a long time to form a slurry, and then the required electrode is obtained through the process of casting, debonding and reduction sintering. This process requires a long time for preparation and production. The addition of organic solvents will have a certain impact on the environment and operators. In addition, the electrode prepared by the tape casting method has no support, and the strength of the electrode prepared under high temperature conditions is low, especially in the environment where the internal temperature of the battery stack is not uniform. The electrode will crack due to local overheating

The other is the dry method disclosed by Chinese Patent No. CN1761092A to prepare electrodes for molten carbonate fuel cells. The method is to mix nickel carbonyl powder and binder together to obtain a raw base plate after being rolled by a rolling machine, and then the raw The substrate is sintered in a sintering furnace to obtain the cathode and anode. Although the process is simple, it requires a lot of pressure to roll the dry powder and the support body together. The uneven distribution of the dry powder in the support body will lead to excessive dry powder. The place where the dry powder is less is rolled into a mirror surface, and the rolling force is not enough in the place where the dry powder is not enough, so the powder is easy to fall off. On the one hand, the hole distribution of the electrode is uneven, and the force of the roller press is too large, which will greatly reduce the porosity of the electrode.

There is also a process for preparing molten carbonate fuel cell electrodes by a wet method. The electrode slurry is used to coat the surface of a support such as a nickel-plated steel strip through a slurry drawing device and sintered into an electrode through a sintering furnace. The electrode prepared by this method Due to the limited porosity of the punched steel strip, the prepared electrode has a lower porosity

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