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A Fluorinated Ether Electrolyte Enabled High Performance Prelithiated Graphite/Sulfur Batteries

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [2];  [2];  [2];  [2];  [2]
  1. Pennsylvania State Univ., University Park, PA (United States). Department of Mechanical and Nuclear Engineering; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, United States
  2. Pennsylvania State Univ., University Park, PA (United States). Department of Mechanical and Nuclear Engineering
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.
Research Organization:
Pennsylvania State Univ., University Park, PA (United States). Department of Mechanical and Nuclear Engineering; Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical and Nuclear Engineering
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
EE0005475; EE0007795
OSTI ID:
1430247
Alternate ID(s):
OSTI ID: 1435968
Report Number(s):
DOE-PENN STATE--0007795; DOE-PENNSTATE--0007795
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 8 Vol. 9; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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