Journal
ELECTROCHEMISTRY
Volume 84, Issue 11, Pages 887-890Publisher
ELECTROCHEMICAL SOC JAPAN
DOI: 10.5796/electrochemistry.84.887
Keywords
Lithium Sulfur Batteries; Lithium Sulfide; Graphene; Ionic Liquids
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Funding
- 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, 16H06368]
- China Scholarship Council (CSC)
- Grants-in-Aid for Scientific Research [15K13815, 15H03874, 16H06368] Funding Source: KAKEN
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A lithium-sulfur cell was developed, consisting of a Si nanoflake negative electrode, a Li2S/graphene positive electrode, and a non-flammable solvate ionic liquid electrolyte. This cell configuration allows us to avoid the use of Li metal electrode and the concomitant dendritic deposition of Li metal at the negative electrode during charging, thereby rendering the cell operation highly safe and stable. The solvate ionic liquid electrolyte solution was composed of tetraglyme, lithium bis(trifluoromethanesulfonyl)amide, and a hydrofluoroether. The solubility of lithium polysulfide (reaction intermediate of the positive electrode) is very low, resulting in high Coulombic efficiency of discharge/charge and long cycle life of the Si/Li2S cell. (C) The Electrochemical Society of Japan, All rights reserved.
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