Ultrahigh rate capability and ultralong cycling stability of sodium-ion batteries enabled by wrinkled black titania nanosheets with abundant oxygen vacancies

Journal Article (Journal Article)

Sodium-ion batteries (SIBs) have been considered as one of the promising alternatives for lithium-ion batteries, owning to the abundant reserve and low cost of sodium-related salts. However, SIBs usually suffer from the sluggish kinetics of Na+ and the serious volume expansion of anode materials, which inevitably restrict the performance of SIBs. Herein, electroconductive wrinkled anatase-phase black titanium oxide nanosheets with rich oxygen vacancies (OVs-TiO2-x) was found to have an ultrafast Na+ insertion and extraction kinetics as anode material in SIBs. The wrinkled structure can significantly reduce the Na+ diffusion length, and the conductive networks formed by wrinkled OVs-TiO2-x can boost the electron transfer during Na+ insertion and extraction processes. With the rapid Na+ insertion/extraction ability, wrinkled OVs-TiO2-x delivers excellent sodium storage performance with high reversible capacity, ultra-high rate capability with the capacity reaches 91 mAh g−1 even at 20,000 mA g−1, and ultra-long cycling stability. These properties demonstrated the great potential of wrinkled OVs-TiO2-x to serve as a realistic choice of anode materials in SIBs.

Full Text

Duke Authors

Cited Authors

  • Ma, L; Gao, X; Zhang, W; Yuan, H; Hu, Y; Zhu, G; Chen, R; Chen, T; Tie, Z; Liu, J; Wu, T; Jin, Z

Published Date

  • November 1, 2018

Published In

Volume / Issue

  • 53 /

Start / End Page

  • 91 - 96

International Standard Serial Number (ISSN)

  • 2211-2855

Digital Object Identifier (DOI)

  • 10.1016/j.nanoen.2018.08.043

Citation Source

  • Scopus