Abstract
Enhanced composites of V2O5/Graphene with delicate structure were successfully designed and synthesized via a smart route. SEM, TEM, XRD, Raman spectra and XPS survey revealed the morphology and structure of V2O5/Graphene composites. The BET surface area and total BJH pore volume of V2O5/Graphene composites were much higher than these of bare V2O5 nanowires. Compared with bare V2O5 nanowires, the V2O5/Graphene composites exhibited improved electrochemical performance. It revealed a discharge capacity of 190.9 mA g−1 in the third cycle and capacity retention of 96.6% after 150 cycles, whereas the bare V2O5 nanowires were 141.8 mA g−1 and 76.5%, respectively. It was noteworthy that the strategy of position-fixing V2O5 nanowires on graphene sheets played a crucial role in the formation of the stable structure of composites. The achieved V2O5/Graphene composites effectively increased the electrical conductivity and electroactive sites, buffered the volume change and provided large contact area during the charge/discharge process. The proposed approach here to obtain composite in this work would render an effective way to improve the electrochemical performance of metal oxide for LIBs.
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