A kind of method for densification of barrier layer of solid oxide battery

Abstract

The invention discloses a method for densifying the barrier layer of a solid oxide battery. The commonly used electrolyte material for a solid oxide battery is YSZ (8%molY 2 o 3 Stabilized ZrO 2 , the chemical formula is: Zr 0.84 Y 0.16 o 2‑x ), YSZ has poor chemical compatibility with many highly active cathode and anode perovskite materials, and is prone to reactions during high-temperature preparation and long-term operation. Cerium oxide-based electrolyte materials mostly form a double electrolyte layer with electrolytes such as YSZ, or serve as an isolation layer to prevent the reaction between electrode materials and electrolytes during high-temperature preparation and long-term operation. The dense GDC isolation layer can effectively reduce the ohmic impedance of the fuel cell and improve the electrical conductivity and catalytic performance of the cell. Ge(NO 3 ) 3 ·6H 2 O and Ce(NO 3 ) 3 ·6H 2 O in a molar ratio of 0.1:0.9 (Ce 0.9 Gd 0.1 o 2‑m ) into a hydrothermal solution, and the battery screen-printed on the GDC barrier layer was reacted at 180° C. for 24 hours by a hydrothermal method, and then a complete battery was prepared. The resulting batteries have higher electrical conductivity and catalytic activity as well as lower ohmic resistance.

Description

technical field [0001] The invention relates to a method for densifying the barrier layer of a solid oxide battery, which is used in the field of solid oxide fuel cells. Background technique [0002] Solid oxide fuel cell is an all-solid-state energy conversion device, which can directly convert chemical energy into electrical energy. A carbon-containing fuel is considered to be the most promising power generation system at present. As a commonly used electrolyte, zirconia-based ceramic thin films still have certain shortcomings. Zirconia-based ceramic thin films are easy to react with perovskite cathode materials to form an insulating phase La 2 Zr 2 o 7 and SrZrO 3 , so that the performance and stability of the battery are reduced. At present, the common method to solve this problem is to add a layer of cerium oxide-based ceramic film as an interlayer between the zirconia-based ceramic material electrolyte and the perovskite cathode to block the reaction between the z...

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Problems solved by technology

DTU, South Korea KIER, etc. have carried out the densification modification of the GDC isolation layer. The density of the isolation layer has been significantly improved by impregnating the GDC precursor solution or the salt solution of the sintering aid in the porous GDC, but it needs to be repeated many times and still requires high temperature. Lower sintering (1150-1275°C) to obtain high density, the process is cumbersome

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