Method for preparing flat-plate type metal-support solid oxide fuel cell

Abstract

The invention discloses a method for preparing a flat-plate type metal-support solid oxide fuel cell. The method comprises the following steps of: firstly respectively preparing three layers of biscuits such as a porous metal support layer, a compact electrolyte layer and a porous cathode precursor layer, then superimposing from bottom to top in sequence for carrying out hot pressing, then carrying out high-temperature common sintering, using a surface active agent to carry out surface treatment on the porous metal support layer, finally immersing a salt solution of an active cathode material in the porous cathode precursor layer, and performing heat treatment, so as to obtain a cathode of the cell; and immersing a salt solution of an active anode material in the porous metal support layer, performing the heat treatment, so as to obtain an anode of the cell. The method has the advantages that the cost is low, the operability is strong, the batched and continuous production is convenient; and according to the prepared cell, the combination among all the layers is close, the thickness, the porosity and the like of all the function layers can be controlled, the cathode and the anode of the cell are prepared by immersion, the performance of the cell is high, the stability is good, the service life of an electric pile can be guaranteed, the cost of a system is reduced and the application prospect is very good.

Description

technical field [0001] The invention relates to a method for preparing a flat metal-supported solid oxide fuel cell, which belongs to the technical field of solid oxide fuel cells. Background technique [0002] Solid Oxide Fuel Cell (SOFC) is an electrochemical device that directly converts the chemical energy of hydrogen, natural gas and biomass gas fuels into electrical energy. Features, can be widely used in large-scale power plants, distributed power plants, automotive auxiliary power supply, household combined heat and power systems, etc. Although SOFC has many excellent properties, it has not yet been applied on a large scale, and its main constraints are cost and lifetime issues. Compared with the traditional electrolyte support or electrode support structure, the new metal support structure can improve the mechanical strength of the single cell, increase the thermal shock resistance of the battery, reduce the cost of the SOFC system, and help solve the problem of st...

AI Technical Summary

Problems solved by technology

[0004] 1. Anode problem: The traditional metal-supported SOFC adopts the structure of metal support / anode / electrolyte / cathode. During the high-temperature co-sintering preparation or long-term operation of the battery, the anode metal particles Ni will coarsen, and will also be combined with the alloy Interdiffusion occurs between elements Fe and Cr

This not only reduces the catalytic performance of the anode, but also leads to changes in the thermal expansion coefficient of the support, a decrease in long-term stability, a decrease in electrical conductivity, and a decrease in oxidation resistance.

Adding a diffusion barrier layer between the anode and the metal support can prevent the interdiffusion between the alloying elements and the anode metal particles, but it will lead to the complexity of the preparation process and the degradation of battery performance. In addition, the diffusion barrier layer cannot solve the problem of the anode Coarsening of Ni particles

[0005] 2. Cathode problem: Traditional cathode materials such as LSM, LSCF, etc. need to be sintered in an air atmosphere at 1000-1200°C to obtain better electrochemical performance, and at such a high temperature, the oxidation of the stainless steel support will become very serious

In this patent, the completed metal support is on the cathode side of the battery, exposed to high-temperature air, and is easily oxidized, which will have a great impact on the long-term stability of the battery; in addition, porous metal is not considered when impregnating the electrode The wettability of the anode layer to the aqueous solution is poor. At the same time, if the anode layer is made after the other layers are sintered, it is more cumbersome and brings about the problem of poor bonding strength.

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