▎ 摘　　要

NOVELTY - The method comprises dissolving lead halide and cesium halide in precursor solvent, obtaining perovskite solution, then coating on anode, obtaining cesium lead halide modified carbon-based anode after drying. The precursor solvent is N-methyl pyrrolidone, dimethyl sulfoxide, dimethylformamide, and/or gamma-butyrolactone. The modified anode is used for a lithium oxygen battery. Under different charging and discharging degrees, by UV excitation, luminous characteristic and electrochemical catalytic performance are obtained, confirming the lithium oxygen battery electrochemical reaction mechanism. USE - The method is useful for in-situ research of lithium-oxygen battery. ADVANTAGE - The method not only can directly analyze the lithium-oxygen battery reaction process in situ, but also can be used as catalyst, improving the electrochemical performance of the lithium oxygen battery. DETAILED DESCRIPTION - The method comprises dissolving lead halide of formula PbX2 and cesium halide (CsX) in precursor solvent, obtaining perovskite solution, then coating the perovskite solution on anode, obtaining Cs4PbX6 modified carbon-based anode after drying. The precursor solvent is N-methyl pyrrolidone, dimethyl sulfoxide, dimethylformamide, and/or gamma-butyrolactone. The Cs4PbX6 modified anode is used for a lithium oxygen battery. Under different charging and discharging degrees, by UV excitation, luminous characteristic and electrochemical catalytic performance are obtained, confirming the lithium oxygen battery electrochemical reaction mechanism. X=Cl -, Br - and/or I-.