Study of 2R-Cell Equipped with LSC and LSCF Cathodes under Thermic and Redox Cycling

The 2R-Cell, developed by Fiaxell Sàrl, provides robustness and reliability upon multiple thermic and redox cycles. In this article we present the results of 2R-Cell tested under thermic and redox cycles. Different cathodes were studied, composite LSC-GDC and LSCF, in terms of electrical performances and resistance to thermic cycles. Degradation due to multiple thermic and redox cycles is reported and discussed. Three composite LSC-GDC cathodes were tested (40, 60 and 75 % GDC). Surprisingly the highest power density was achieved with a cathode containing 75% of GDC in the composite layer. The cell provided a current density of 1060 [mA/cm²] at 0.8 V and 780°C, before thermic cycling. This cell underwent 40 thermic cycles with an average power loss of 0.7 % per cycle and providing a power of 621 [mW/cm²] at the end. A LSCF cathode equipped 2R-Cell, tested by EPFL our partner in an EU project (Roxsolidcell), was subjected to 20 thermic cycles and 20 redox cycles. With this cathode material the average ASR increase was 0.3% per thermic cycle and 0.5 % per redox cycle. SEM pictures of the tested cells after thermic and redox cycles are presented and discussed.