Corresponding Author

Xue-Ping GAO(xpgao@nankai.edu.cn)


With rutile TiO2 and NaOH as starting materials, the Na2Ti6O13 nanotubes were prepared by a hydrothermal reaction. The carbon-coated Na2Ti6O13 nanotubes were obtained by treating the Na2Ti6O13 nanotubes for 4 h in glucose aqueous solutions containing 0.1 mol?L-1 NaOH. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microcopy (TEM). The results showed that the dimensions of carbon-coated Na2Ti6O13 nanotubes were 14 ~ 19 nm of outer diameter, 2 ~ 5 nm of inner diameter, and several hundreds nanometers of length with a carbon layer of about 2 nm being coated on outer surface of the nanotubes. As an anode material for lithium ion battery, the carbon-coated Na2Ti6O13 nanotubes exhibited an excellent cycle performance and high rate discharge capability compared with the Na2Ti6O13 nanotubes. At 50 mA?g-1, the reversible capacities of the carbon-coated Na2Ti6O13 nanotubes were 161 mAh?g-1 in the initial cycle and 147 mAh?g-1 after 100 cycles. When the discharge-charge current density was 1600 mA?g-1, the reversible capacity of the carbon-coated Na2Ti6O13 nanotubes still reached 70 mAh?g-1,much higher than that of Na2Ti6O13 nanotubes.

Graphical Abstract


Li-ion battery, anode material, Na2Ti6O13 nanotubes, carbon-coated, high-rate capability

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