19November2018

Nano-Micro Letters

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

Su Nie1, Li Liu1, 2, *, Junfang Liu1, Jianjun Xie1, Yue Zhang1,Jing Xia1,Hanxiao Yan1, Yiting Yuan1, Xianyou Wang1

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Nano-Micro Lett. (2018) 10: 71

First Online: 20 September 2018 (Article)

DOI:10.1007/s40820-018-0225-1

*Corresponding author. E-mail: liulili1203@126.com

 

Abstract

 


Toc

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.


 

Keywords

Nanofibers; Anode materials; Sodium-ion batteries; Pseudocapacitance; Nitrogen-doping

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