Preparation of cathode material for co-sintering with electrolyte at high temperature

T. Kon, Atsunori Kamegawa, H. Takamura

Research output: Contribution to journalArticlepeer-review

Abstract

Ti-doped La-Sr-Co-Fe-based oxides (LSTCFs) were prepared as cathode material for co-sintering with electrolyte at high temperatures. LSTCFs have relatively high solid solubility limits of Ti up to 80mol%. Before reaching the solubility limits, LSTCFs were well densified and single phase with a rhombohedral structure (R-3c). Meanwhile, after exceeding the solubility limits, a Ti-rich secondary phase appeared and microstructures tend to be porous. Electrical conductivity and thermal expansion coefficient (TEC) for LSTCF decreased with increasing Ti content. Ti4+ appears to work as a donor and suppress electronic spin state transition of Co3+ ions and formation of oxygen vacancies. The composition, such as La0.6Sr0.4Ti 0.4Co0.2Fe0.8)0.6O 3-δ (LSTCF28) with 40 mol%Ti and La0.6Sr 0.4Ti0.6 (Co0.8Fe0.2) 0.4O3-δ (LSTCF82) with 60 mol%Ti, showed low sinterability and sufficient thermomechanical compatibility with GDC electrolyte. Those, however, possess more than two order of magnitude lower electrical conductivity than those of typical cathode materials.

Original languageEnglish
Pages (from-to)1901-1908
Number of pages8
JournalECS Transactions
Volume57
Issue number1
DOIs
Publication statusPublished - 2013

ASJC Scopus subject areas

  • Engineering(all)

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