文摘
MnO2 doped with Ce was hydrothermally synthesized and the as-made breathable waterproof membrane used outside the cathode was prepared for improving the lithium-air battery performance in air. The samples were characterized by scanning electron microscopy (SEM), energy dispersive spectrum analysis (EDS), charge–discharge cycle tests, charge–discharge cycle tests of limited capacity, and electrochemical impedance spectroscopy (EIS) tests. The result showed that CexMn1-xO2 can effectively reduce the charge overpotential of the cathode. The charge and discharge electrical potential difference of Ce0.1Mn0.9O2 was only 700 mV while MnO2’s was 2100 mV. And Ce0.1Mn0.9O2 that exhibited high discharge capacity of 400 mAh g−1 in air had a stable discharge platform of 2.5 V and then the more obvious charge phenomenon appeared after 3.5 V. The excellent catalysis, the effect of cathode catalytic materials named CexMn1-xO2, may attribute to the decrease of reaction potential energy of oxygen reduction reaction and oxygen evolution reaction.