In Situ Fabrication of Branched TiO2/C Nanofibers as Binder‐Free and Free‐Standing Anodes for High‐Performance Sodium‐Ion Batteries. Issue 30 (4th June 2019)

• Record Type: Journal Article
• Authors: Wang, Ling; Yang, Guorui; Wang, Jianan; Wang, Silan; Wang, Caiyun; Peng, Shengjie; Yan, Wei; Ramakrishna, Seeram
• Is Part Of: Small. Volume 15:Issue 30(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-06-04
• Subjects: anodes -- branched TiO2/C nanofibers -- electrospinning -- pseudocapacitive behavior; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201901584
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Herein, 1D free‐standing and binder‐free hierarchically branched TiO2 /C nanofibers (denoted as BT/C NFs) based on an in situ fabrication method as an anode for sodium‐ion batteries are reported. The in situ fabrication endows this material with large surface area and strong structural stability, providing this material with abundant active sites and smooth channels for fast ion transportation. As a result, BT/C NFs with the character of free‐standing membranes are directly used as binder‐free anode for sodium‐ion batteries, delivering a capacity of 284 mA h g −1 at a current density of 200 mA g −1 after 1000 cycles. Even at a high current density of 2000 mA g −1, the reversible capacity can still achieve as high as 204 mA h g −1 . By means of kinetic analysis, it is demonstrated that the remarkable surface pseudocapacitive behavior is also a major factor to achieve excellent performance. The rationally designed structure coupled with the inherent pseudocapacitive behavior gives this material potential for sodium‐ion batteries. Abstract : Free‐standing hierarchically branched TiO2 /C nanofibers are in situ fabricated as an anode for sodium‐ion batteries. The large surface area, flexible feature, and pseudocapacitive sodium storage behavior provide this material with abundant active sites, smooth channels for fast ions transportation, strong structural stability, and therefore excellent electrochemical performance when directly used as a binder‐free anode for sodium‐ion batteries.