title: An effective approach to protect lithium anode and improve cycle performance for Li-S batteries.
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.
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Chemical Engineering and Environment, Beijing Institute of Technology , Beijing 100081, P.R. China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wu
authors.forename: Ji
authors.initials: J
authors.lastname: Qian
authors.forename: Renjie
authors.initials: R
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Lu
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Huiming
authors.initials: H
authors.lastname: Wu
authors.forename: Junzheng
authors.initials: J
authors.lastname: Chen
authors.forename: Teng
authors.initials: T
authors.lastname: Zhao
authors.forename: Yusheng
authors.initials: Y
authors.lastname: Ye
authors.forename: Khalil
authors.initials: K
authors.lastname: Amine
keywords: LiODFB; electrochemistry; electrolyte; lithium anode; lithium−sulfur batteries; passivation layer