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The recent boom in large-scale energy storage system promotes the development of lithium-oxygen batteries because of their high theoretical energy density.However,their applications are still limited by the sluggish kinetic,insoluble discharge product deposition and the undesired parasitic reaction.Herein,the free-standing nitrogen doped reduced graphene oxide/Co(OH)2 (NRGO/Co(OH)2) composite films were prepared by a facile hydrothermal method.The NRGO/Co(OH)2 composite films display interconnected three-dimensional conductive network,which can not only promote the diffusion of O2 and the transport of electrolyte ions,but also provide abundant storage space for discharge products.Moreover,the introduction of nitrogen-containing functional groups results in improved conductivity and electron adsorption ability,which can facilitate electron transport and enhance the surface catalytic activity.Combining with excellent catalytic performance,the lithium-oxygen batteries with NRGO/Co (OH)2 composite film cathodes deliver low charge overpotential and excellent cycling performance.