Carbon electrode with perovskite-oxide catalyst for aqueous electrolyte lithium-air secondary batteries

摘要

Carbon electrodes with perovskite-type oxide catalysts were investigated as air electrodes for aqueous lithium-air secondary batteries. The system consisted of a water-stable lithium electrode, an aqueous solution of saturated LiOH with 10 M LiCl as electrolyte, and a carbon black air electrode with perovskite catalyst additive. The stability, oxygen reduction and oxygen evolution catalytic activity of the La_(0.6)Ca_(0.4)Co_(0.8)Fe_(0.2)O_3, La_(0.8)Sr_(0.2)Fe_(0.8)Mn_(0.2)O_3, and La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_3 perovskite-type oxides were examined in the LiOH-LiCI electrolyte. The perovskite-type oxides were stable in this solution and the oxygen reduction and evolution overpotential on the carbon black substrate was decreased by addition of these perovskite-type oxides. No chlorine evolution was observed during the oxidation reaction on carbon black with the perovskite-type oxides in the LiOH-LiCl electrolyte. The results indicate that carbon black with perovskite-type oxide additives is a potential candidate for the air electrode in the aqueous electrolyte lithium-air rechargeable batteries.