Composite electrolyte material based on zirconium oxide based oxide

Abstract

The invention relates to a composite electrolyte material based on a zirconium oxide based oxide for a solid oxide fuel battery. The composite electrolyte material is characterized by being prepared by steps of adequately grinding and sintering the zirconium oxide based oxide, inorganic slat, and / or other oxides or an oxide-doped mixture after thermal treatment. The composite electrolyte material provided by the invention has the advantages that the advantages of a zirconium oxide based electrolyte which is stable in property, compact in structure, high in voltage of an open circuit of a battery and the like are maintained, the conductive capacity of oxygen ions can be improved, the problem that the output voltage quickly attenuates along with increase of current density, and the output performance of the battery is improved. The composite electrolyte material is simple in preparation process and low in preparation cost.

Description

Technical field [0001] The invention relates to a composite electrolyte material for solid oxide fuel cells. Background technique [0002] Solid oxide fuel cells (SOFCs) are a new type of clean and high-efficiency energy conversion device. Because of their strong adaptability to fuels, they do not need to use precious metals as catalysts and can be combined with hotspots. Commonly used solid oxide fuel cell electrolytes include zirconia-based oxides, ion-doped ceria, and doped lanthanum gallate. [0003] Traditional SOFCs use yttria-stabilized zirconia (YSZ) as the electrolyte, which has good redox stability, good sintering compactness, high mechanical strength, and high battery open circuit voltage. However, due to the low oxygen ion conductivity of zirconia-based electrolyte materials (<800°C), the operating temperature of SOFCs is generally around 1000°C. Jeffrey W. Fergus reported in "Power Sources" (Joumal of Power Sources, 162, 30-40, 2006) that with the decrease of temp...

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Problems solved by technology

Long-term high-temperature and high-temperature work often leads to problems such as reactions between battery components and thermal expansion coefficient mismatch, which also severely limits the selection of materials for battery components and peripheral equipment, making the cost high

In addition, S. Souza et al. reported in the Journal of the Electrochemical Society (Journal of the Electrochemical Society, 144, L35-L37, 1997) that although the battery prepared with a zirconia-based electrolyte has a high open circuit voltage, the increases, the output voltage drops rapidly, resulting in a decrease in battery output power

The application of zirconia-based electrolyte materials in solid oxide fuel cells has been seriously affected

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