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Solvent Effect of Room Temperature Ionic Liquids on Electrochemical Reactions in Lithium–Sulfur Batteries
Abstract
A room temperature ionic liquid (RTIL), N, N -diethyl- N -methyl- N -(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)amide ([DEME][TFSA]), was used as an electrolyte solvent for lithium–sulfur (Li–S) batteries. Li[TFSA] was dissolved into [DEME][TFSA] to prepare the electrolytes, and a molecular solvent—tetraethylene glycol dimethyl ether (TEGDME)—was used for Li[TFSA] as a reference. Discharge–charge tests of Li–S cells using these electrolytes were carried out. The discharge–charge cycle stability and Coulombic efficiency of a cell with an RTIL electrolyte were found to be surprisingly superior to those of a cell with TEGDME electrolyte. The poor cycle stability of the cell with the TEGDME electrolyte was attributed to the dissolution of lithium polysulfides (Li 2 S m ), which were generated as reaction intermediates through a redox process at the S cathode in the Li–S cell. RTIL has low donor ability owing to the weak Lewis basicity of [TFSA] − anion, whereas conventional ether-based molecular solvents such as TEGDME have high donor ability. The dissolution of Li 2 S m was significantly suppressed owing to the weak donor ability of RTIL. In the RTIL electrolyte, Li 2 S m was immobilized on the electrode, and the electrochemical reaction of the S species occurred exclusively in the solid phase. These results clearly prove a novel solvent effect of RTILs on the electrochemical reactions of the S cathode in Li–S cells.
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Citations
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Metadata
- Authors
- Park, J.-W., Yamauchi, K., Takashima, E., Tachikawa, N., Ueno, K., Dokko, K., & Watanabe, M.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-02-21
- Volume
- 117
- Issue
- 9
- Pages
- 4431-4440
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2328387405
- Cited by
- 213
- References
- 0
- FWCI
- 14.18
- Type
- journal article
- Language
- en
- Open access
- closed
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