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Ultrathin N‐doped carbon‐coated TiO2 coaxial nanofibers as anodes for lithium ion batteries

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The structural optimization of TiO2 materials has a significance for improving the electrochemical performance since TiO2 suffers from poor electronic conductivity. For this purpose, ultrathin N‐doped carbon‐coated TiO2 coaxial nanofibers have been designed and synthesized by a facile electrospinning approach. Microstructure analysis indicates that the TiO2 nanofibers can be coated by the ultrathin carbon layers. Electrochemical tests reveal that the rate performance and cycling ability of TiO2@C nanofibers have been enhanced obviously. The TiO2@C6 nanofibers carbonized at 600°C exhibit superior features with a specific discharge capacity of 284 mAh g−1 at a current density of 100 mA g−1 after 100 cycles. Besides improved rate performance of 117 mAh g−1 at a high current density of 2000 mA g−1 and excellent cycling stability with only about 0.008% capacity loss per cycle were also obtained in the sample TiO2@C6 after 500 cycles at the current density of 1000 mA g−1. Such remarkable performance may be ascribed to the unique one‐dimensional nanofibers as flexible carbon matrix.
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Keywords: TiO2 anode; electrospinning; lithium ion battery; nanofiber

Document Type: Research Article

Publication date: July 1, 2017

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