Preparation method of composite solid electrolyte for fuel cell

Abstract

The invention discloses a preparation method of a composite solid electrolyte for a fuel cell. The method comprises the steps of firstly, respectively obtaining solutions A and B according to a stiochiometric ratio of Zr<0.8>Ni<0.2>O<1.9> and TiCe<0.8>La<0.2>O<2.9>; secondly, obtaining mixed gel of the solutions by a sol-gel method; and finally, performing sintering to obtain the composite solid electrolyte. In the composite solid electrolyte prepared by the method, the electrical conductivity of a material electrode reaches 0.114S / cm or above under 800 DEG C, reaches 0.268S / cm or above under700 DEG C and reaches 0.106S / cm or above under 600 DEG C; compared with a traditional electrolyte which cannot be applicable to low and medium temperatures, the composite solid electrolyte can be suitably used under a condition of 600-800 DEG C; and the method is controllable in preparation process and low in sintering temperature, and industrial production can be achieved.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a medium-low temperature composite solid electrolyte for fuel cells and a preparation method thereof. Background technique [0002] Energy is an essential material basis for human survival and social development. Among them, carbon-containing compounds such as coal, oil, and natural gas are collectively referred to as carbon-based fuels. At present, the primary power generation efficiency of carbon-based fuels is only about 30%, and there are large pollution and greenhouse gas emissions. Many other defects. The solid oxide fuel cell (SOFC) is an electrochemical power generation device that can directly convert the chemical energy of the fuel into electrical energy. The primary power generation efficiency is as high as 50-60%, and it has the advantages of high efficiency and low pollution. [0003] In a single battery, poor thermal matching of the sintering performance of el...

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Problems solved by technology

[0003] In a single battery, poor thermal matching of the sintering performance of electrode materials and electrolyte materials, unstable conductivity of the electrolyte, and structural damage caused by weak battery strength may lead to attenuation of the performance of the entire battery stack, and the traditional SOFC operating temperature Generally at 1000°C, working at such a high temperature makes SOFC have problems such as electrode densification, high requirements for connector materials, and poor battery sealing performance, which increases the cost of SOFC. Therefore, the current research on solid oxide fuel cells is generally Improve electrolyte materials so that SOFC can work at medium and low temperatures. For example, patent 201710237453.X discloses a conductivity of 1.45×10 at a medium temperature of 750°C. -2 S / cm composite electrolyte, patent 201510609504.8 discloses that the conductivity of the composite solid electrolyte material can reach 175mS / cm at 850°C

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