Nitrogen-doped graphene derived from polyaniline/graphene oxide composites with improved capacity and cyclic performance of Li-O2 battery
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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-O2 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-O2 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-O2 batteries at low cost.
KeywordsNitrogen doping Graphene Lithium oxygen battery Capacity Cyclic performance
This work was supported by the National Natural Science Foundation of China (Grant No. 51874051) and the Guangxi Natural Science Foundation (No. 2016GXNSFAA380107 and 2018GXNSFAA281184).
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