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Title: Electrolyte with Low Polysulfide Solubility for Li-S Batteries

Abstract

Here, Li-S battery is one of the most promising next generation rechargeable battery technologies due to its high theoretical energy density and low material cost. While its success is impeded by the low energy efficiency and fast capacity fade primarily caused by the discharge intermediates, Li-polysulfides (PS), dissolution in the electrolyte. Mitigation of PS dissolution in electrolyte involves the search of new electrolyte solvent system that exhibits poor solvation to the PS while still have good solvation ability to the electrolyte salt for high ionic conductivity. Applying co-solvents with reduced solvating power but compatible with the state of art Li-S battery’s ether-based electrolyte is one of the most promising concepts. This route is also advantageous of having a low scale-up cost. With the aids of Quantum Chemical Calculation, we have identified high carbon-to-oxygen (C/O) ratio ethers as co-solvent in the new electrolytes that effectively impede PS dissolution while still maintaining high ionic conductivity. Significantly improved cycle life and cycling Coulombic efficiency are observed for Li-S cells using the new composite electrolytes. Anode analysis with different methods also demonstrate that reducing electrolyte’s PS solubility results in less sulfur total amount on the lithium anode surface and lower ratio of the longer-chainmore » PS, which is probably a sign of suppressed side reactions between the anode and PS in the electrolyte.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1439302
Report Number(s):
BNL-205712-2018-JAAM
Journal ID: ISSN 2574-0962
Grant/Contract Number:  
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ACS Applied Energy Materials
Additional Journal Information:
Journal Volume: 1; Journal Issue: 6; Journal ID: ISSN 2574-0962
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Li-S battery; electrolyte; polysulfide solubility; high C/O ratio ether; solvation structure; long cycle life

Citation Formats

Sun, Ke, Wu, Qin, Tong, Xiao, and Gan, Hong. Electrolyte with Low Polysulfide Solubility for Li-S Batteries. United States: N. p., 2018. Web. doi:10.1021/acsaem.8b00317.
Sun, Ke, Wu, Qin, Tong, Xiao, & Gan, Hong. Electrolyte with Low Polysulfide Solubility for Li-S Batteries. United States. doi:10.1021/acsaem.8b00317.
Sun, Ke, Wu, Qin, Tong, Xiao, and Gan, Hong. Wed . "Electrolyte with Low Polysulfide Solubility for Li-S Batteries". United States. doi:10.1021/acsaem.8b00317. https://www.osti.gov/servlets/purl/1439302.
@article{osti_1439302,
title = {Electrolyte with Low Polysulfide Solubility for Li-S Batteries},
author = {Sun, Ke and Wu, Qin and Tong, Xiao and Gan, Hong},
abstractNote = {Here, Li-S battery is one of the most promising next generation rechargeable battery technologies due to its high theoretical energy density and low material cost. While its success is impeded by the low energy efficiency and fast capacity fade primarily caused by the discharge intermediates, Li-polysulfides (PS), dissolution in the electrolyte. Mitigation of PS dissolution in electrolyte involves the search of new electrolyte solvent system that exhibits poor solvation to the PS while still have good solvation ability to the electrolyte salt for high ionic conductivity. Applying co-solvents with reduced solvating power but compatible with the state of art Li-S battery’s ether-based electrolyte is one of the most promising concepts. This route is also advantageous of having a low scale-up cost. With the aids of Quantum Chemical Calculation, we have identified high carbon-to-oxygen (C/O) ratio ethers as co-solvent in the new electrolytes that effectively impede PS dissolution while still maintaining high ionic conductivity. Significantly improved cycle life and cycling Coulombic efficiency are observed for Li-S cells using the new composite electrolytes. Anode analysis with different methods also demonstrate that reducing electrolyte’s PS solubility results in less sulfur total amount on the lithium anode surface and lower ratio of the longer-chain PS, which is probably a sign of suppressed side reactions between the anode and PS in the electrolyte.},
doi = {10.1021/acsaem.8b00317},
journal = {ACS Applied Energy Materials},
issn = {2574-0962},
number = 6,
volume = 1,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
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