Fe3O4@C Nanotubes Grown on Carbon Fabric as a Free‐Standing Anode for High‐Performance Li‐Ion Batteries. Issue 64 (6th October 2020)

• Record Type: Journal Article
• Authors: Xu, Xijun; Shen, Jiadong; Li, Fangkun; Wang, Zhuosen; Zhang, Dechao; Zuo, Shiyong; Liu, Jun
• Is Part Of: Chemistry. Volume 26:Issue 64(2020)
• Page Start: 14708
• Page End: 14714
• Publication Date: 2020-10-06
• Subjects: anodes -- electrochemistry -- flexibility -- free-standing -- Li-ion batteries -- nanotube arrays; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202002938
• Languages: English
• ISSNs: 0947-6539

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 Fe3 O4 @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 Fe3 O4 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 Fe3 O4 @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). Fe3 O4 @C nanotube arrays still achieve a capacity of 665 mA h g −1 after 50 cycles at 0.1 A g −1 in Fe3 O4 @C//LiCoO2 full cells. Abstract : Flexible batteries : Uniform Fe3 O4 @C nanotube arrays are fabricated successfully through a facile in situ etching and deposition route, combined with annealing treatment. Owing to the unique carbon‐encapsulated nanotube arrays design, this free‐standing Fe3 O4 @C anode can effectively palliate the volume variation, reduce the diffusion distance of Li +, and thus, promote the electrochemical reaction kinetics, thereby achieving a superior rate capability and stable cycling performance.