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ACS Appl Mater Interfaces. 2014 Sep 10;6(17):15542-9. doi: 10.1021/am504345s. Epub 2014 Aug 22.

An effective approach to protect lithium anode and improve cycle performance for Li-S batteries.

Author information

1
Beijing Key Laboratory of Environmental Science and Engineering, School of Chemical Engineering and Environment, Beijing Institute of Technology , Beijing 100081, P.R. China.

Abstract

Lithium oxalyldifluoroborate (LiODFB) has been investigated as an organic electrolyte additive to improve the cycling performance of Li-S batteries. Cell test results demonstrate that an appropriate amount of LiODFB added into the electrolyte leads to a high Coulombic efficiency. Analyses by energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and the density functional theory showed that LiODFB promotes the formation of a LiF-rich passivation layer on the lithium metal surface, which not only blocks the polysulfide shuttle, but also stabilizes the lithium surface.

KEYWORDS:

LiODFB; electrochemistry; electrolyte; lithium anode; lithium−sulfur batteries; passivation layer

PMID:
25100666
DOI:
10.1021/am504345s

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