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Effect of sulfolane on the morphology and chemical composition of the solid electrolyte interphase layer in lithium bis(oxalato)borate‐based electrolyte
Author(s) -
Yu Tao,
Liu Jinliang,
Zhang Hongming,
Li Shiyou,
Cui Xiaoling,
Feng Huixia,
Zhao Yangyu,
Liu Haining,
Li Faqiang
Publication year - 2014
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5347
Subject(s) - electrolyte , chemistry , ethylene carbonate , lithium (medication) , inorganic chemistry , sulfolane , electrochemistry , chemical engineering , organic chemistry , solvent , medicine , electrode , engineering , endocrinology
To discuss the source of sulfolane (SL) in decreasing the interface resistance of Li/mesophase carbon microbeads cell with lithium bis(oxalate)borate (LiBOB)‐based electrolyte, the morphology and the composition of the solid electrolyte interphase (SEI) layer on the surface of carbonaceous anode material have been investigated. Compared with the cell with 0.7 mol l −1 LiBOB‐ethylene carbonate/ethyl methyl carbonate (EMC) (1 : 1, v/v) electrolyte, the cell with 0.7 mol l −1 LiBOB‐SL/EMC (1 : 1, v/v) electrolyte shows better film‐forming characteristics in SEM (SEI) spectra. According to the results obtained from Fourier transform infrared spectroscopy, XPS, and density functional theory calculations, SL is reduced to Li 2 SO 3 and LiO 2 S(CH 2 ) 8 SO 2 Li through electrochemical processes, which happens prior to the reduction of either ethylene carbonate or EMC. It is believed that the root of impedance reduction benefits from the rich existence of sulfurous compounds in SEI layer, which are better conductors of Li + ions than analogical carbonates. Copyright © 2013 John Wiley & Sons, Ltd.