Co3O4 nanorods/graphene nanosheets nanocomposites for lithium ion batteries with improved reversible capacity and cycle stability

Co3O4 nanorods/GNS (graphene nanosheets) nanocomposites have been synthesized through a one-spot solvothermal method, and characterized by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. Electrochemical performances reveal that the obtained Co3O4 nanorods/GNS nanocomposites exhibit improved cycling stability, remarkably high reversible lithium storage capacity and superior rate capability, e.g. approximate 1310 mAh g(-1) and 1090 mAh g(-1) of capacity are retained even after 40 cycles at a current density of 100 mA g(-1) and 1000 mA g(-1), respectively. The high electrochemical performances can be attributed to the unique structure of Co3O4 nanorods/GNS nanocomposites, in which the 1D structure of Co3O4 can prevent the aggregation of Co3O4 and reduce the stacking degree of GNS, providing an excellent ion diffusion and electronic conduction pathway. (C) 2011 Elsevier B.V. All rights reserved.