Synthesis of TiOx Nanotubular Arrays with Oxygen Defects as High‐Performance Anodes for Lithium‐Ion Batteries

As promising, safe, high‐power electrode materials for lithium‐ion batteries (LIBs), titanium‐dioxide‐based anodes that have been prepared to date are still restricted by their limited specific capacity. In this work, we demonstrate a facile electrochemical anodization for TiO x nanotubular arrays of oxygen defects in a nitrogen atmosphere. In comparison with those fabricated under air conditions, the as‐prepared nanotubular arrays present much reduced impedance with oxygen defects, which allow fast electronic and ionic transport in the TiO x nanotubular arrays. The binder‐free anode based on as‐prepared TiO x nanotubular arrays exhibited record‐setting capacities (395, 325, and 235 mAh g −1 at 0.2, 1, and 10 C, respectively) among TiO 2 ‐based anode materials, that is, approaching state‐of‐the‐art TiO 2 electrodes for LIBs.