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The effect of water-containing electrolyte on lithium-sulfur batteries

Journal Article · · Journal of Power Sources
 [1];  [2];  [3];  [3];  [1]
  1. University of Illinois at Urbana-Champaign, Urbana, IL (United States). Department of Chemistry
  2. University of Illinois at Urbana-Champaign, Urbana, IL (United States). Frederick Seitz Materials Research Laboratory
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Dissolved polysulfides, formed during Li-S battery operation, freely migrate and react with both the Li anode and the sulfur cathode. These soluble polysulfides shuttle between the anode and cathode – the so-called shuttle effect – resulting in an infinite recharge process and poor Columbic efficiency. We present that water present as an additive in the Li-S battery electrolyte is found to reduce the shuttle effect in Li-S batteries. Batteries where water content was below 50 ppm exhibited a substantial shuttle effect and low charge capacity. Alternatively, addition of 250 ppm water led to stable charge/discharge behavior with high Coulombic efficiency. XPS results show that H2O addition results in the formation of solid electrolyte interphase (SEI) film with more LiOH on Li anode which protects the Li anode from the polysulfides. Batteries cycled without water result in a SEI film with more Li2CO3 likely formed by direct contact between the Li metal and the solvent. Intermediate quantities of H2O in the electrolyte result in high cycle efficiency for the first few cycles which then rapidly decays. Lastly, this suggests that H2O is consumed during battery cycling, likely by interaction with freshly exposed Li metal formed during Li deposition.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357; AC04-94AL85000
OSTI ID:
1478467
Alternate ID(s):
OSTI ID: 1549460
Report Number(s):
SAND--2018-9770J; 667648
Journal Information:
Journal of Power Sources, Journal Name: Journal of Power Sources Journal Issue: C Vol. 369; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Anode Interface Engineering and Architecture Design for High‐Performance Lithium–Sulfur Batteries journal January 2019
Elektrolytadditive für Lithiummetallanoden und wiederaufladbare Lithiummetallbatterien: Fortschritte und Perspektiven journal October 2018
Electrolyte Additives for Lithium Metal Anodes and Rechargeable Lithium Metal Batteries: Progress and Perspectives journal October 2018
Toward Better Lithium–Sulfur Batteries: Functional Non-aqueous Liquid Electrolytes journal August 2018
Recent Progress in Liquid Electrolyte-Based Li–S Batteries: Shuttle Problem and Solutions journal November 2018
Electron regulation enabled selective lithium deposition for stable anodes of lithium-metal batteries journal January 2019

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