YSZ electrolyte slurry and preparation method thereof

Abstract

The invention provides YSZ electrolyte slurry, which comprises YSZ powder, a binder and a dispersing agent, and the YSZ powder comprises nano-scale YSZ powder, submicron-scale YSZ powder and micron-scale YSZ powder; the particle size D50 of the nano-scale YSZ powder is 0.05-0.07 [mu] m, the particle size D50 of the submicron-scale YSZ powder is 0.1-0.5 [mu] m, and the particle size D50 of the micron-scale YSZ powder is 1-1.2 [mu] m. According to the invention, the nanoscale, submicron and micron YSZ powder with the particle size range is adopted for grain grading, the large-size powder inhibits abnormal growth of crystal grains when an electrolyte membrane layer is prepared, sintering shrinkage of the membrane layer is inhibited, and defects are reduced; and the small-size powder is filled into the pores, is preferentially sintered at a high temperature and is in contact with the large-size powder to generate mass transfer, so that grain growth rearrangement is promoted, and the densification of the electrolyte membrane layer is further promoted. On the premise of reducing defects of the electrolyte membrane layer and ensuring compactness through grain composition, the sintering temperature required for compactness of the electrolyte membrane layer is reduced. In addition, the dispersing agent inhibits powder agglomeration and improves the dispersity, so that the slurry is uniformly dispersed.

Description

technical field [0001] The invention relates to the field of electrolytes for fuel cells, in particular to a YSZ electrolyte slurry and a preparation method thereof. Background technique [0002] Solid oxide fuel cell (SOFC) is a kind of energy conversion device that can generate electricity without noise pollution, high efficiency and cleanness. One of the key technologies for the preparation of SOFC is to obtain a sufficiently thin and gas-tight, dense and defect-free electrolyte film. Yttria-stabilized zirconia (YSZ) is the best electrolyte cubic structure CSZ (doped with 8mol% Y 2 o 3 ZrO 2 , namely 8YSZ), showing the largest ionic conductivity (up to 0.1s cm at 1000°C -1 ), has the advantages of maintaining a pure ionic conductor in the range of large fluctuations in oxygen partial pressure, maintaining stable physical and chemical properties at high temperatures, high mechanical strength and ionic conductivity at high temperatures, and stable oxidation of yttrium ox...

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Problems solved by technology

[0004] The invention provides a YSZ electrolyte slurry and a preparation method thereof, which solves the problems of easy agglomeration when the submicron YSZ powder is made into a slurry in the prior art, defects caused by abnormal grain growth during sintering, poor density of the electrolyte layer and cost. advanced questions

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