Long Term Stability Study of a Solid Oxide Metal-Air Battery

Abstract

A new high temperature rechargeable “metal-air” battery has recently been proposed as a new mechanism for grid energy storage. This new battery consists of a regenerative solid oxide fuel cell (RSOFC) and a metal/metal oxide redox couple. In this paper we present the working principle, thermodynamic and kinetic perspectives, and key features of the new battery. Iron is selected as the redox-couple material to store the energy. The long-term test of the battery over 100 cycles at a high rate shows a gradual decline of performance that eventually stabilizes. Post-test analysis indicates that the origin of the degradation is associated with the anode of RSOFC.