Electrochemical Properties of Carbon Materials and La0.6Sr0.4Fe0.6Mn0.4O3 Electrocatalysts for Air Electrodes of Lithium-air Secondary Batteries

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, La0.65Sr0.4Fe0.6Mn0.4O3, to the air electrodes as an electrocatalyst.