Preparation And Performance Of CoFe₂O₄ And Carbon Onedimensional Nanomaterials As Anode Materials For Lithium-ion Batteries

Lithium ion batteries?LIBs? have been widely used due to the high energy density, high output voltage, light weight and long life. But the theoretical capacity of commercial graphite is only 370 mA h g-1, which is unable to meet the increasing demand for LIBs. Rational design of electrode materials has an importance effect on the properties of LIBs. Herein, one dimensional?1D? CoFe₂O₄ nanostructure has been successfully synthesised using electrospinning technique and the subsequent calcinate process. And carbon nanotube is also synthesized by the electrospinning and polymerization technique. The as-obtained materials were characterized by X-ray diffraction?XRD?, Transmission electron microscopy?SEM?, transmission electron microscopy?TEM? and X-ray photoelectron microscopy?XPS?. The electrochemical performance of the CoFe₂O₄ materials and carbon nanotube as anode materials for LIBs is studied by galvanostatic charge-discharge tests. And the influence of the calcination temperatures on the electrochemical properties has been analyzed.The different morphologies of CoFe₂O₄ nanostructures are obtained at 500?, 600?, 700?, respectively in the air. The as-synthesized CoFe₂O₄ hollow nanostructure calcined at 600 ? exhibits the best electrochemical property as anode material of LIBs. The CoFe₂O₄ electrode shows high initial discharge capacity of 910 mA h g-1 and charge capacity of 890 mA h g-1 at the current density of 100 mA g-1, Even after 150 cycles, the composite delivers a good discharge capacity of 830 mA h g-1 and charge capacity of 825 mA h g-1 with high capacity retention ratio of 91.21%. The electrochemical property of carbon nanotube synthesized after calcination at 600 ? in the inert atmospheres is also investigated. The product exhibits a high initial discharge capacity of 1210 mA h g-1 and charge capacity of 850 mA h g-1 at the current density of 100 mA g-1, the capacity is retained at 800 mA h g-1 after 100 cycles. The remarkable electrochemical properties of CoFe₂O₄ hollow structure and carbon nanotube ensure the great promise for commercial utilization.