A Fluorinated Ether Electrolyte Enabled High Performance Prelithiated Graphite/Sulfur Batteries [electronic resource].

Published:: Washington, D.C. : United States. Office of the Assistant Secretary of Energy Efficiency and Renewable Energy, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:: pages 6,959-6,966 : digital, PDF file
Additional Creators:: United States. Office of the Assistant Secretary of Energy Efficiency and Renewable Energy and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

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 study, 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. Lastly, by coupling prelithiated graphite anodes with sulfur cathodes with high areal capacity of ~3 mAh cm^-2, we demonstrate prelithiated graphite/sulfur batteries that show high sulfur-specific capacity of ~1000 mAh g^-1 and an excellent capacity retention of >65% after 450 cycles at C/10.

Report Numbers:

E 1.99:doe-pennstate--0007795
doe-pennstate--0007795

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Published through SciTech Connect.
02/03/2017.
"doe-pennstate--0007795"
"PII:974"
ACS Applied Materials and Interfaces 9 8 ISSN 1944-8244 AM
Shuru Chen; Zhaoxin Yu; Mikhail L. Gordin; Ran Yi; Jiangxuan Song; Donghai Wang.
Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical and Nuclear Engineering

Funding Information:

EE0007795
EE0005475

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