A Coordinated-Anion-Enriched Electrolyte for Lean-Electrolyte Li–S Batteries
Journal Article
·
· ACS Energy Letters
- George Mason Univ., Fairfax, VA (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Univ. of Maryland, College Park, MD (United States)
- George Mason Univ., Fairfax, VA (United States); Univ. of Miami, Coral Gables, FL (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
The solid electrolyte interphase (SEI) on Li and cathode electrolyte interphase (CEI) at sulfurized polyacrylonitrile (SPAN) formed in the commonly used liquid electrolytes cannot accommodate the large volume change of both Li anode and SPAN cathode, resulting in severe electrolyte and Li consumption and fast capacity decay under high mass loading and lean electrolyte condition. Herein, a LiF-rich SEI and a LiF-LixNyOz co-enriched CEI are simultaneously formed by adding ionic liquid (Py13TFSI) in the localized high-concentration electrolyte (LHCE), which forms a coordinated-anion-enriched solvation structure. In this study, the LiF-rich interphase results in less stress/strain during large volume changes of Li and SPAN and therefore achieving obviously improved stability even at a high areal capacity. Consequently, Li (50 μm)||SPAN (6 mg cm-2) pouch cells under the lean electrolyte condition (E/S ratio of 5 mL gSPAN-1) delivers a stable cycle life of 120 cycles with 79.2% capacity retention, demonstrating great promise for high-energy-density lithium-sulfur batteries.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-06CH11357; SC0012704
- OSTI ID:
- 2433978
- Report Number(s):
- BNL--225982-2024-JAAM
- Journal Information:
- ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 8 Vol. 9; ISSN 2380-8195
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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