Reduced graphene oxide/CoFe2O4-Co nanocomposite as high performance anode for lithium ion batteries

Reduced graphene oxide/CoFe2O4-Co (RGO/CFC) nanocomposite was first prepared by a facile hydrothermal strategy and subsequently in situ reduction process. X-ray diffraction, Raman spectra, and scanning electron microscopy are employed to characterize the structure and morphology of the as-prepared RGO/CFC nanocomposite. The electrochemical performances of the nanocomposite were evaluated in coin-type cells. It delivers high reversible capacity of 921.8 mA h g(-1) at various rates from 100 to 1600 mA g(-1) after 70 cycles. Even after 420 cycles at 9000 mA g(-1), the capacity still retains 907.3 mA h g(-1) at 100 mA g(-1), indicating outstanding rate capability and cycle stability. The improved electrochemical performance is ascribed to the strong interfacial interaction between CFC nanoparticles (30 nm) and RGO nanosheets. The RGO/CFC nanocomposite with super long cycling life will be an ideal candidate of anode material for lithium ion batteries. (C) 2013 Elsevier B. V. All rights reserved.