期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 13, 页码 4231-4235出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201511830
关键词
batteries; dimethyl disulfide; electrolytes; lithium-sulfur; organosulfides
资金
- Office of Vehicle Technologies of the U.S. Department of Energy [DEEE0005475]
Lithium-sulfur (Li-S) batteries have recently received great attention because they promise to provide energy density far beyond current lithium ion batteries. Typically, Li-S batteries operate by conversion of sulfur to reversibly form different soluble lithium polysulfide intermediates and insoluble lithium sulfides through multistep redox reactions. Herein, we report a functional electrolyte system incorporating dimethyl disulfide as a co-solvent that enables a new electrochemical reduction pathway for sulfur cathodes. This pathway uses soluble dimethyl polysulfides and lithium organosulfides as intermediates and products, which can boost cell capacity and lead to improved discharge-charge reversibility and cycling performance of sulfur cathodes. This electrolyte system can potentially enable Li-S batteries to achieve high energy density.
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