Reaction Mechanism Characterization of La 0.5 Sr 0.5 CoO 2.91 Electrocatalyst for Rechargeable Li-air Battery

Li-air batteries have ultra-high capacity and energy density, however, the reaction mechanism is unclear because of the limits on characterization method. To further investigating the reaction mechanism of Li-air battery based on hierarchical mesoporous perovskite La0.5Sr0.5CoO2.91 nanowires electrocatalyst which constructed in our previous work, we investigate the discharge reaction product by in-situ transmission electron microscope(TEM) and Raman spectrum. The increase of carbon/oxygen ratio value after electron beam irradiation and the lattice vibration are observed thus demonstrating the existence of Li2O2. Further Raman spectrum investigation indicates that some impuritiesinsert into the carbon. Besides, apossible catalytic mechanism was proposed by analyzingligand field.