期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 8, 页码 6959-6966出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b11008
关键词
batteries; fluorinated electrolytes; lithium/sulfur; prelithiated; graphite
资金
- Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE) [DE-EE0005475, DE-EE0007795]
Lithium/sulfur (Li/S) batteries have attracted great attention as a promising energy storage technology, but so far their practical applications are greatly hindered by issues of polysulfide shuttling and unstable lithium/electrolyte interface. To address these issues, a feasible strategy is to construct a rechargeable prelithiated graphite/sulfur batteries. In this work, a fluorinated ether of bis(2,2,2-trifluoroethyl) ether (BTFE) was reported to blend with 1,3-dioxolane (DOL) for making a multifunctional electrolyte of 1.0 M LiTFSI DOL/BTFE (1:1, v/v) to enable high performance prelithiated graphite/S batteries. First, the electrolyte significantly reduces polysulfide solubility to suppress the deleterious polysulfide shuttling and thus improves capacity retention of sulfur cathodes. Second, thanks to the low viscosity and good wettability, the fluorinated electrolyte dramatically enhances the reaction kinetics and sulfur utilization of high-areal-loading sulfur cathodes. More importantly, this electrolyte forms a stable solid electrolyte interphase (SEI) layer on graphite surface and thus enables remarkable cyclability of graphite anodes. By coupling prelithiated graphite anodes with sulfur cathodes with high areal capacity of similar to 3 mAh cm(-2), we demonstrate prelithiated graphite/sulfur batteries that show high sulfur-specific capacity of similar to 1000 mAh g(-1) and an excellent capacity retention of >65% after 450 cycles at C/10.
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