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A high performance lithium–sulfur battery enabled by a fish-scale porous carbon/sulfur composite and symmetric fluorinated diethoxyethane electrolyte

Author:
Gao, Mengyao, Su, ChiCheung, He, Meinan, Glossmann, Tobias, Hintennach, Andreas, Feng, Zhenxing, Huang, Yaqin, Zhang, Zhengcheng
Source:
Journal of materials chemistry A 2017 v.5 no.14 pp. 6725-6733
ISSN:
2050-7496
Subject:
batteries, carbon, chemistry, electrodes, electrolytes, ethane, solvents, sulfur
Abstract:
A high performance lithium–sulfur (Li–S) battery comprising a symmetric fluorinated diethoxyethane electrolyte coupled with a fish-scale porous carbon/S composite electrode was demonstrated. 1,2-Bis(1,1,2,2-tetrafluoroethoxy)ethane (TFEE) was first studied as a new electrolyte solvent for Li–S chemistry. When co-mixed with 1,3-dioxolane (DOL), the DOL/TFEE electrolyte suppressed the polysulfide dissolution and shuttling reaction. When coupled with a fish-scale porous carbon/S composite electrode, the Li–S cell exhibited a significantly high capacity retention of 99.5% per cycle for 100 cycles, which is far superior to the reported numerous systems.
Agid:
6425135