A preparation method of a high-performance flat solid oxide fuel cell

Abstract

The invention relates to a method for preparing a high-performance slab solid oxide fuel single battery. The preparation method comprises: a support electrode diaphragm and an electrolyte diaphragm are overlapped and are subjected to hot pressing under a vacuum condition so as to form a first complex diaphragm; a non-support electrode diaphragm and a complex diaphragm are overlapped and then are subjected to hot pressing so as to form a second complex diaphragm; one side of an electrolyte of the first complex diaphragm and one side of the non-support electrode of the second complex diaphragm are overlapped in a contact manner so as to form a single battery blank; the single battery blank is sintered so as to manufacture a single battery, wherein the complex diaphragm is burnt out during the sintering process, a anode diaphragm is formed by the support electrode diaphragm and a cathode diaphragm is formed by the non-support electrode diaphragm, or the cathode diaphragm is formed by the support electrode diaphragm and the anode diaphragm is formed by the non-support electrode diaphragm; the complex diaphragm is prepared from substances which can be burnt out at a temperature of 200-1450 DEG C.

Description

technical field [0001] The invention relates to a preparation method of a high-performance flat solid oxide fuel cell, and belongs to the field of energy materials. Background technique [0002] Solid oxide fuel cell (Solidoxide fuel cell, SOFC) is a device that can directly convert fuel chemical energy into electrical energy, with high energy conversion efficiency (over 85% overall efficiency), wide fuel adaptability (available fuels include hydrogen, natural , syngas, liquid hydrocarbon fuel), no need for precious metal catalysts, safety and pollution-free, etc., it has broad application prospects in large-scale power plants, distributed power sources and household combined heat and power. [0003] SOFC can be classified into high temperature (800-1000°C), medium-high temperature (600-800) and low temperature (<600°C) SOFC according to its working temperature. At present, the operating temperature of the mainstream SOFC is generally between 700-800 ° C, which belongs t...

AI Technical Summary

Problems solved by technology

Compared with co-sintering, the interfacial contact resistance after secondary sintering is often also very large, especially at low temperatures; the second preparation method is screen printing, that is, screen printing on the "electrode / electrolyte" composite green body Print another electrode material, and finally co-sinter together to obtain a single cell or a single cell skeleton. Researchers such as Shanghai Jiaotong University in China and the University of Pennsylvania in the world initially used this method to prepare single cells. This method can be used to a certain extent. To reduce the interface contact resistance, but the process is more complicated, and the yield is very low

The third preparation method is the film pasting method, which refers to pasting another electrode casting film on the "supporting electrode / electrolyte" composite body. Although this pasting method can prepare a single cell and has a high yield, it does not The reliability of the interface contact cannot be guaranteed, and the difference between different batteries is also very large, and there is also a large gap between the battery performance and its theoretical value

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