Conformal carbon coating on WS2 nanotubes for excellent electrochemical performance of lithium-ion batteries

Jinqiang Zhang, Hagit Sade, Yufei Zhao, Adrian T. Murdock, Avi Bendavid, Jean Paul Lellouche, Guoxiu Wang, Zhaojun Han

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

WS2 nanotubes with carbon coatings in a core-shell structure (i.e. WS2@C) are synthesized through a facile method based on the Lewis acid-activated thioglycosylation chemistry. The obtained WS2@C shows a conformal coverage of conductive amorphous carbon on the surface of WS2 after thermal treatment, with the thickness of carbon layer being controlled by adjusting the molar ratios of saccharide to nanotube during the synthesis process. When applied in lithium-ion batteries, the WS2@C structures show higher reversible capacity of 638 mAh g-1 at a current density of 500 mA g-1 and significantly improved cycling stability as compared to the pristine WS2 nanotubes. Post-mortem examinations of the electrode materials reveal that the carbon coatings could preserve the morphology of WS2 nanotubes and assist in forming stable solid electrolyte interface layers, leading to enhanced cycling stability. As such, the WS2@C structures show great potential in the application of lithium-ion batteries for achieving excellent electrochemical performances.

Original languageEnglish
Article number035401
JournalNanotechnology
Volume30
Issue number3
DOIs
StatePublished - 18 Jan 2019

Bibliographical note

Publisher Copyright:
© 2018 IOP Publishing Ltd.

Keywords

  • WS nanotube
  • conformal carbon coating
  • lithium-ion battery
  • nanocomposite
  • solidelectrolyte interface

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