Electrospun Composite of Fe_3O_4/Cu Nanocrystals Encapsulated in Carbon Fibers as an Anode Material with High Rate Capability for Lithium Ion Batteries

摘要

In this paper, a new composite with Fe_3O_4 and Cu nanoparticles encapsulated in carbon nanofibers (CNFs) and its electrochemical properties were reported. The composite is fabricated by a simple electrospinning technique followed by heat treatment. At a current density of 100 mA g~(-1), this electrode exhibits a high reversible capacity of 540.5 mAh g~(-1) after 100 cycles. Moreover, this composite electrode also shows good rate capability when current density increased from 0.1 to 5.0 Ag~(-1). This excellent performances can be ascribed to the novel fiber architecture and Cu introduction. Cu nanocrystal in the CNFs ensures the composite a good conductive ability.