Composite reagent for tape casting, fuel cell and preparation method of fuel cell

Abstract

The invention provides a composite reagent for tape casting, a fuel cell and a preparation method of the fuel cell. The reagent comprises a composite solvent, a composite liquid binder and a composite plasticizer, the universal reagent for composite tape casting is obtained, the difference of raw material powder in different structures can be weakened when a fuel cell is prepared, the shaping, lubricity and ductility of a tape casting blank are optimized at the same time through the synergistic effect, and the service life of the fuel cell is prolonged. Hot press molding is easier between the tape casting layers, and the film has higher self-adaptability to oxides and metal powder, and is suitable for tape casting to prepare each structure of a fuel cell; a half cell containing an anode and an electrolyte of a fuel cell is prepared by adopting the reagent for tape casting, and a cathode is prepared by adopting a pyrolysis spraying mode, so that the preparation process of the fuel cell is simplified, the firing time of part of key components is prolonged, and the production cost is reduced. And the limitation that a conventional cathode cannot be prepared by sintering a battery support body mainly made of stainless steel or containing metal components in a high-temperature oxidizing atmosphere is avoided.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a compound reagent for tape casting, a fuel cell and a preparation method of the fuel cell. Background technique [0002] Solid oxide fuel cell is currently the technology with the highest energy conversion efficiency among known power generation technologies. The pure power generation efficiency can be as high as 70%, and the combined heat and power can be as high as 90%. Traditional solid oxide fuel cells are mainly used for distributed power generation because of their all-ceramic structure. The use of metal supports such as stainless steel can replace the ceramic support in the battery that determines the mechanical strength of the battery, so that it has a good application prospect in the mobile field, such as an extended-range power generation device for new energy vehicles, and is currently a research hotspot in the world. [0003] At present, the earliest and most repre...

AI Technical Summary

Problems solved by technology

This casting method is not sensitive to thickness, such as millimeter-scale or hundreds of micron-scale casting blanks, but if it is used to prepare fuel cell active layers with a thickness of only tens of microns or a few microns In the electrolyte layer, because part of the solid binder and plasticizer will incompletely dissolve the micro-particles to a certain extent during the dissolution process, the organic matter will cause defects after grading during the sintering process, resulting in gas communication on both sides of the battery, reducing battery performance and Affects battery life

Moreover, it is difficult for a single plasticizer to soften the binder while increasing the lubricity and ductility of the casting process, and it is difficult to meet the demand for processes that require hot pressing

[0005] CN105332029A discloses a method for preparing a conductive and corrosion-resistant cobalt-manganese spinel coating for a solid oxide fuel cell connector. The coating prepared by the method is well bonded to the substrate, the process is simple, and it has good conductivity and corrosion resistance. It proved the feasibility of cobalt-manganese spinel coating, but the stress of the coating prepared by electrochemical deposition is complex and easy to cause cracking, and the current and voltage may be unstable, and the coating thickness may be uneven, which will affect the performance.

[0006] CN105239050A discloses a method for preparing a spinel oxide protective coating on stainless steel connectors of solid oxide fuel cells. The annealing method to prepare spinel oxide is complicated in process and high in cost, which is not suitable for industrial production

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