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Vol. 10 No. 4 (2018)

Nitrogen-Doped TiO2–C Composite Nanofibers with High-Capacity and Long-Cycle Life as Anode Materials for Sodium-Ion Batteries

https://doi.org/10.1007/s40820-018-0225-1
Su Nie
National Base for International Science and Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, People’s Republic of China
Li Liu
National Base for International Science and Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, People’s Republic of China
Junfang Liu
National Base for International Science and Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, People’s Republic of China
Jianjun Xie
National Base for International Science and Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, People’s Republic of China
Yue Zhang
National Base for International Science and Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, People’s Republic of China
Jing Xia
National Base for International Science and Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, People’s Republic of China
Hanxiao Yan
National Base for International Science and Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, People’s Republic of China
Yiting Yuan
National Base for International Science and Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, People’s Republic of China
Xianyou Wang
National Base for International Science and Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, People’s Republic of China

Corresponding Author: Li Liu

liulili1203@126.com

Nano-Micro Letters, Vol. 10 No. 4 (2018), Article Number: 71

Abstract

Nitrogen-doped TiO2–C composite nanofibers (TiO2/N–C NFs) were manufactured by a convenient and green electrospinning technique in which urea acted as both the nitrogen source and a pore-forming agent. The TiO2/N–C NFs exhibit a large specific surface area (213.04 m2 g−1) and a suitable nitrogen content (5.37 wt%). The large specific surface area can increase the contribution of the extrinsic pseudocapacitance, which greatly enhances the rate capability. Further, the diffusion coefficient of sodium ions (DNa+) could be greatly improved by the incorporation of nitrogen atoms. Thus, the TiO2/N–C NFs display excellent electrochemical properties in Na-ion batteries. A TiO2/N–C NF anode delivers a high reversible discharge capacity of 265.8 mAh g−1 at 0.05 A g−1 and an outstanding long cycling performance even at a high current density (118.1 mAh g−1) with almost no capacity decay at 5 A g−1 over 2000 cycles. Therefore, this work sheds light on the application of TiO2-based materials in sodium-ion batteries.


Highlights:


1 Nitrogen-doped TiO2–C composite nanofibers (TiO2/N–C NFs) are fabricated using green, inexpensive urea as a nitrogen source and pore-forming agent.
2 X-ray photoelectron spectroscopy results reveal changes in the content of different nitrogen species in detail.
3 The TiO2/N–C NFs anode exhibits excellent sodium storage performance.

Keywords

Nanofibers Anode materials Sodium-ion batteries Pseudocapacitance Nitrogen-doping
Nie, Su, Li Liu, Junfang Liu, Jianjun Xie, Yue Zhang, Jing Xia, Hanxiao Yan, Yiting Yuan, and Xianyou Wang. 2018. “Nitrogen-Doped TiO2–C Composite Nanofibers With High-Capacity and Long-Cycle Life As Anode Materials for Sodium-Ion Batteries”. Nano-Micro Letters 10 (4):71. https://doi.org/10.1007/s40820-018-0225-1.
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