TOWARDS THE CONVERSION OF A SOLID OXIDE CELL INTO A HIGH TEMPERATURE BATTERY

摘要

A Rechargeable Oxide Battery (ROB) is based on a high temperature Solid Oxide Cell (SOC) that works alternately in fuel cell and electrolyzer mode. Instead of externally storing the electrolytic hydrogen, a stagnant atmosphere composed of hydrogen and steam is used direcdy as an oxidizing and reducing agent for a metal-metal oxide material, which serves as integrated energy storage. As a consequence, all the expenses related to pumping losses, heat losses and further components can be avoided. Storage components are manufactured by means of tape casting or extrusion using iron oxide (Fe_2O_3) based slurries or pastes with varying additions of CaO or CaCO_3. Redox cycling as well as thermogravimetric studies and microstructural analyses of storage components using XRD and SEM have shown that the use of 28-66 mol.% CaO or CaCO_3 provides promising redox cycle performance due to the reversible formation of mixed oxide phases.