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 TiO 2 /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 TiO 2 . As a result, the Fe-TiO 2 /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 TiO 2 /carbon nanofiber and other TiO 2 -based anodes reported in the literatures. These results indicates the powerful effect of in-situ Fe-doping for enhancing the Na-storage property of TiO 2 .