Rodlike FeSe₂–C derived from metal organic gel wrapped with reduced graphene as an anode material with excellent performance for lithium-ion batteries

In this work, we synthesize a high performance FeSe₂–C/rGO (reduced graphene oxide) anode material for lithium-ion batteries. Benefiting from the advantages of using Fe-MOG (Metal organic gel) as precursor and the addition of rGO sheets, the rodlike FeSe₂ is obtained, and the graphene not only limit the size of FeSe₂ rods to smaller, but improve the conductivity. Cyclic voltammetry, galvanostatic discharge/charge and electrochemical impedance spectroscopy are utilized to examine the electrochemical characteristic of FeSe₂–C/rGO anode. The cell display an extremely stable electrochemical properties during the redox reaction process and superior rate performance. Particularly, the discharge capacity of FeSe₂–C/rGO anode is 917.6 mA h g⁻¹ after 100 cycles at 100 mA g⁻¹ with the coulombic efficiency of 99%, which is slightly higher than the initial discharge capacity in cycling. Besides, the FeSe₂–C/rGO anode material exhibit the best cyclability compared to FeSe₂–C, Fe₂O₃–C/rGO and FeS₂–C/rGO anode material, which are prepared by the analogous synthesis process.