期刊
JOURNAL OF POWER SOURCES
卷 307, 期 -, 页码 746-752出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.01.045
关键词
Lithium batteries; Solvate ionic liquids; Tetraglyme; Polymer binder; Lithium polysulfide
资金
- Specially Promoted Research for Innovative Next Generation Batteries (SPRING) of the Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST)
- JSPS KAKENHI from the Japan Society for the Promotion of Science (JSPS) [15H03874, 15K13815]
- Grants-in-Aid for Scientific Research [15H03874, 15K13815] Funding Source: KAKEN
Electrochemical reactions in Li-S cells with a solvate ionic liquid (SIL) electrolyte composed of tetraglyme (G4) and Li[TFSA] (TFSA: bis(trifiuoromethanesulfonyl)amide) are studied. The sulfur cathode (S cathode) comprises sulfur, carbon powder, and a polymer binder. Polyethylene oxide) (PEO) and poly(vinyl alcohol) (PVA-x) with different degrees of saponification (x%) are used as binders to prepare the composite cathodes. For the Li-S cell containing PEO binder, lithium polysulfides (Li2Sm, 2 <= m <= 8), reaction intermediates of the S cathode, dissolve into the electrolyte, and Li2Sm acts as a redox shuttle in the Li-S cell. In contrast, in the Li-S cell with PVA-x binder, the dissolution of Li2Sm is suppressed, leading to high columbic efficiencies during charge-discharge cycles. The compatibility of the PVA-x binder with the SIL electrolyte changes depending on the degree of saponification. Decreasing the degree of saponification leads to increased electrolyte uptake by the PVA-x binder, increasing the charge and discharge capacities of Li-S cell. The rate capability of Li-S cell is also enhanced by the partial swelling of the PVA-x binder. The enhanced performance of Li-S cell containing PVA-x is attributed to the lowering of resistance of Li+ ion transport in the composite cathode. (C) 2016 Elsevier B.V. All rights reserved.
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