Fe<sub>3</sub>O<sub>4</sub>@C Nanotubes Grown on Carbon Fabric as a Free‐Standing Anode for High‐Performance Li‐Ion Batteries
Xijun Xu, Jiadong Shen, Fangkun Li, Zhuosen Wang, Dechao Zhang, Shiyong Zuo, Jun Liu
Abstract
Abstract Recently, Li‐ion batteries (LIBs) have attracted extensive attention owing to their wide applications in portable and flexible electronic devices. Such a huge market for LIBs has caused an ever‐increasing demand for excellent mechanical flexibility, outstanding cycling life, and electrodes with superior rate capability. Herein, an anode of self‐supported Fe 3 O 4 @C nanotubes grown on carbon fabric cloth (CFC) is designed rationally and fabricated through an in situ etching and deposition route combined with an annealing process. These carbon‐coated nanotube structured Fe 3 O 4 arrays with large surface area and enough void space can not only moderate the volume variation during repeated Li + insertion/extraction, but also facilitate Li + /electrons transportation and electrolyte penetration. This novel structure endows the Fe 3 O 4 @C nanotube arrays stable cycle performance (a large reversible capacity of 900 mA h g −1 up to 100 cycles at 0.5 A g −1 ) and outstanding rate capability (reversible capacities of 1030, 985, 908, and 755 mA h g −1 at 0.15, 0.3, 0.75, and 1.5 A g −1 , respectively). Fe 3 O 4 @C nanotube arrays still achieve a capacity of 665 mA h g −1 after 50 cycles at 0.1 A g −1 in Fe 3 O 4 @C//LiCoO 2 full cells.