Electrochemical Properties of Carbon Materials and La_0.6Sr_0.4Fe_0.6Mn_0.4O₃ Electrocatalysts for Air Electrodes of Lithium-air Secondary Batteries

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Lithium-air batteries using Ketjen Black-EC600JD for their air electrodes exhibited a rather large discharge capacity of about 3000 mAh g⁻¹ at a current density of 0.05 mA cm⁻². However, the cycle performance of the batteries was very poor due to the high overpotential for charging. The cycle properties were greatly improved by adding the Fe–Mn-based perovskite-type oxide, La_0.6Sr_0.4Fe_0.6Mn_0.4O₃, to the air electrodes as an electrocatalyst.