Concentrated Electrolyte for the Sodium-Oxygen Battery: Solvation Structure and Improved Cycle Life
Journal Article
·
· Angewandte Chemie (International Edition)
- The Ohio State Univ., Columbus, OH (United States). Dept of Chemistry & Biochemistry
- California State Univ. (CalState), Long Beach, CA (United States). Dept. of Physics and Astronomy
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Alkali metal-oxygen batteries are of great interests for energy storage because of their unparalleled theoretical energy densities. Particularly attractive is the emerging Na-O2 battery because of the formation of superoxide as the discharge product. Dimethyl sulfoxide (DMSO) is a promising solvent for this battery but its instability towards Na makes it impractical in the Na-O2 battery. Here in this paper, we report the enhanced stability of Na in DMSO solutions containing concentrated sodium trifluoromethanesulfonimide (NaTFSI) salts (>3molkg-1). Raman spectra of NaTFSI/DMSO electrolytes and abinitio molecular dynamics simulation reveal the Na+ solvation number in DMSO and the formation of Na(DMSO)3(TFSI)-like solvation structure. The majority of DMSO molecules solvating Na+ in concentrated solutions reduces the available free DMSO molecules that can react with Na and renders the TFSI anion decomposition, which protects Na from reacting with the electrolyte. Using these concentrated electrolytes, Na-O2 batteries can be cycled forming sodium superoxide (NaO2) as the sole discharge product with improved long cycle life, highlighting the beneficial role of concentrated electrolytes for Na-based batteries.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1352612
- Journal Information:
- Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 49 Vol. 55; ISSN 1433-7851
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Stabilization of Li Metal Anode in DMSO‐Based Electrolytes via Optimization of Salt–Solvent Coordination for Li–O
2
Batteries
Solvation Structure Design for Aqueous Zn Metal Batteries
Journal Article
·
Tue Mar 07 19:00:00 EST 2017
· Advanced Energy Materials
·
OSTI ID:1400619
Solvation Structure Design for Aqueous Zn Metal Batteries
Journal Article
·
Mon Dec 07 19:00:00 EST 2020
· Journal of the American Chemical Society
·
OSTI ID:1737441