Conformal carbon coating on WS <inf>2</inf> nanotubes for excellent electrochemical performance of lithium-ion batteries

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Journal Article
Nanotechnology, 2019, 30 (3)
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© 2018 IOP Publishing Ltd. WS 2 nanotubes with carbon coatings in a core-shell structure (i.e. WS 2 @C) are synthesized through a facile method based on the Lewis acid-activated thioglycosylation chemistry. The obtained WS 2 @C shows a conformal coverage of conductive amorphous carbon on the surface of WS 2 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 WS 2 @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 WS 2 nanotubes. Post-mortem examinations of the electrode materials reveal that the carbon coatings could preserve the morphology of WS 2 nanotubes and assist in forming stable solid electrolyte interface layers, leading to enhanced cycling stability. As such, the WS 2 @C structures show great potential in the application of lithium-ion batteries for achieving excellent electrochemical performances.
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