Hydrogenation Driven Conductive Na₂Ti₃O₇ Nanoarrays as Robust Binder-Free Anodes for Sodium-Ion Batteries

Abstract

We present a general and rational approach to fabricate highly accessible and affordable sodium-ion battery anodes by engineering three-dimensional hydrogenated Na2Ti3O7 nanoarrays supported on flexible Ti substrates. The hydrogenated Na2Ti3O7 nanoarrays exhibit desirable properties for sodium storage, such as high surface area, high electrical conductivity, and Na(+) diffusivity. The as-obtained nanoarrays demonstrate remarkably stable and robust Na-storage performance when tested as binder-free anodes for sodium-ion battery. They can afford a high reversible (desodiation) capacity of 227 mAh g(-1) and retain a capacity of 65 mAh g(-1) over 10,000 continuous cycles at a high rate of 35 C. Therefore, through this synergy of array architecture and hydrogenation, it is possible to engineer numerous anodes that can reversibly store Na(+) ions in a fast and stable manner.

Design and Synthesis of Layered Na2Ti3O7 and Tunnel Na2Ti6O13 Hybrid Structures with Enhanced Electrochemical Behavior for Sodium‐Ion Batteries

“…The width of Na 2 Ti 6 O 13 microrod was wider than that of Na 2 Ti 3 O 7 . By careful comparison, it was found that the widths of two phases were much wider than that of the previous published paper,24, 34, 35, 36 which may hinder the bulk Na + diffusion and result in a pseudocapacitive phenomenon. The selected area electron diffraction (SAED) pattern of Na 2 Ti 6 O 13 exhibited a monoclinic characteristic spot pattern and proved that the phase was single crystalline (Figure 2b).…”

Binder and carbon-free SbSn-P nanocomposite thin films as anode materials for sodium-ion batteries

“…The apparatus used for PLD was described elsewhere [11]. A 355 nm laser beam from Q-Switched Nd:YAG laser (Spectra Physics GCR-150) with a pulsed repetition rate of 10 Hz and a pulsed width of 5 ns was focused onto the SbSn-P target, and the laser intensity was about 2.5 J cm -2 .…”

“…hard carbon etc.) [6][7][8][9] and titanium-based intercalation compounds [10][11][12][13]. However, these materials suffer from relatively low specific capacity.…”

The Application of Hollow Structured Anodes for Sodium‐Ion Batteries: From Simple to Complex Systems

“…This study suggested that there is a strain caused by volume change during sodiation process, which can be partially alleviated by the hollow structure. [36,37] As compared to the hollow spheres, thanks to the prolonged length and the consequently high length-to-diameter ratio, the 1D hollow structured anodes, for example, nanotubes, possess extra advantages of good conducting connectivity and better structural stability. Thanks to the good connectivity of tubes and different modifications as shown in the scanning and transmission electron microscope (SEM and TEM) images, a capacity retention of over 90% after 10 000 cycles was achieved, demonstrating their excellent stability ( Figure 1D-F).…”