Synthesis and Properties of Nitrogen-Doped Graphene as Anode Materials for Lithium-Ion Batteries

摘要

Nitrogen-doped graphene (N-rGO) was successfully synthesized during the reduction of grapheneoxide by the modified Hummersmethod. In contrast to the reduced graphene oxide (rGO), N-rGOpresented superior morphology, structure and composition as the anode of lithium-ion batteries (LIBs)according to the examination of SEM, TEM, XRD, Raman spectrum and XPS. The doping content ofnitrogen in N-rGO was about 7.98 at.%. The electrochemical performances of N-rGO as anodes ofLIBs were also evaluated accordingly. Thus-prepared N-rGO showed a higher reversible specific-1 -1 -1 capacity of 332 mAh g during 600 cycles at 500 mA . Even at 4 A , a reversible capacity of 208-1 mAh can still be maintained. The improved electrochemical performance of N-rGO as anodes ofLIBs could be due to the specific characteristics of the unique nanostructures, the covalent interactionsbetween N and graphene, the good conductivity and high surface areas, which reduce the transferresistance for Li-ion and electron and provide more extra live regions for Li storage.