The α-Fe ₂ O ₃ /graphite anode composites with enhanced electrochemical performance for lithium-ion batteries

Abstract

Abstract The α-Fe 2 O 3 /graphite composites were prepared by a thermal decomposition method using the expanded graphite as the matrix. The α-Fe 2 O 3 nanoparticles with the size of 15–30 nm were embedded into interlayers of graphite, forming a laminated porous nanostructure with a main pore distribution from 2 to 20 nm and the Brunauer−Emmett−Teller surface area of 33.54 m 2 g −1 . The porous structure constructed by the graphite sheets can alleviate the adverse effects caused by the huge volume change of the α-Fe 2 O 3 grains during the charge/discharge process. The composite electrode exhibits a high reversible capacity of 1588 mAh g −1 after 100 cycles at 100 mA g −1 , 702 mAh g −1 at 5 A g −1 , 460 mAh g −1 at 10 A g −1 after 160 cycles, respectively, showing good cycle stability and outstanding rate capability at high current densities.