Increased sodium-ion storage performances of uniform TiO2/carbon nanofibers by in-situ Fe-doping

TiO(2 )is recognized as a promising anode material for sodium-ion batteries (SIBs) due to its low-cost and high structural stability, but it suffers from intrinsically poor electrical conductivity and low electrochemical activity at high rates. Herein, an in-situ Fe-doping strategy is designed to increase sodium-ion storage performance of TiO2/carbon nanofibers by a simple electrospinning method. The combination of Fe-doping with one-dimensional carbon structure could enable fast electron and Na+ ion transport of TiO2. As a result, the Fe-TiO2/carbon nanofiber electrode exhibits high specific capacity (283 mAh g(-1) at 0.5 C), excellent rate capability (140 mAh g(-1) at 30 C) and long cycling stability (98% retention after 3000 cycles), which is obviously superior to pure TiO2/carbon nanofiber and other TiO2-based anodes reported in the literatures. These results indicates the powerful effect of in-situ Fe-doping for enhancing the Na-storage property of TiO2. (C) 2019 Elsevier B.V. All rights reserved.