Double‐Carbon Enhanced TiO 2 Nanotubes as Highly Improved Anodes for Sodium‐Ion Batteries

TiO 2 , with low cost, highly environmental benignity, and high safety, has been considered to exhibit great potential as an advanced anode material for sodium ion batteries (SIBs), although slow electron/ion transport hinders its development. Here, we find the composite of thin‐walled TiO 2 nanotubes with a double carbon coating by hydrothermal reaction and calcination, which effectively improves the structural stability and promotes electron transport. The composite material of TiO 2 /rGO@NC delivers the first charge specific capacity of 245.8 mA h g −1 at 0.02 A g −1 , along with 118.7 and 91.7 mA h g −1 at high current densities of 2.5 and 5 A g −1 . Simultaneously, it can still offer 135.8 mA h g −1 over 500 cycles at the current density of 1 A g −1 . The remarkable electrochemical performance, combining with its own properties, demonstrates that it can be used as a hopeful anode material for superior performance SIBs.