Abstract
AbstractA self‐supporting film composed of arrays of Li4Ti5O12 (LTO) nanoparticles (NPs) prepared through chemical lithiation of anodic TiO2 nanotube arrays and calcination in air is used as a high‐performance binder‐free anode in lithium‐ion batteries (LIBs). The LTO nanoparticles formed in situ are closely connected along the axial direction of the pristine TiO2 nanotubes, forming a beaded stream‐like structure. The self‐supporting NPs film has a large tap density and overall packing factor, and the three‐dimensional (3D) network of NPs increases the electroactive interface, facilitating transfer of Li+ and enhancing the intercalation kinetics during charging/discharging. The LTO electrode with excellent mechanical flexibility and robustness has a volumetric capacity of 304 mAh cm−3 at a current density of 50 mA cm−3 as well as a high rate capability of 208 mAh cm−3 at 5000 mA cm−3. After undergoing 500 cycles at a high current density of 1250 mA cm−3, 91.4 % of the capacity is retained, demonstrating high reversibility and cycling stability of the binder‐free LTO NPs film electrode in LIBs.
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