Ultrathin N‐doped carbon‐coated TiO2 coaxial nanofibers as anodes for lithium ion batteries |
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Authors: | Bingqing Xu Yidong Luo Ting Liu Qinghua Zhang Yuan‐Hua Lin Ce‐Wen Nan Yang Shen Rujun Chen Hong Xu Jingwei Li |
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Affiliation: | State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China |
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Abstract: | 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: | electrospinning lithium ion battery nanofiber TiO2 anode |
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