The effect of water-containing electrolyte on lithium-sulfur batteries
Journal Article
·
· Journal of Power Sources
- University of Illinois at Urbana-Champaign, Urbana, IL (United States). Department of Chemistry
- University of Illinois at Urbana-Champaign, Urbana, IL (United States). Frederick Seitz Materials Research Laboratory
- 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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