▎ 摘　　要

Nitrogen-doped graphene (NGO) was synthesized by the pyrolysis of precursor polyaniline/graphene oxide composites, where the nitrogen content of the NGO was dependent on the loading amount of polyaniline. The Li-O-2 cell with the NGO cathode exhibits a higher full-discharge capacity and longer cycle life than the one with the graphene oxide cathode. SEM and Raman analyses indicate that film-like Li2O2 product is formed on the NGO cathode in battery discharging following a surface-pathway mode, due to the adsorption of soluble intermediates by the nitrogen-containing species of the NGO cathode according to rotating ring disk electrode analysis, which effectively lowers the charge potential of Li-O-2 cells and alleviates the corrosion of Li anode. The simple synthesis of NGO with good catalytic performance and electric conductance is prospective to be applied on Li-O-2 batteries at low cost.