Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 21, Issue 11, Pages 4233-4237Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201405344
Keywords
carbon nanotube fabrics; cyclability; electrochemical performance; room-temperature sodium-sulfur batteries; sodium sulfide electrodes
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0005397]
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A unique sodium sulfide (Na2S) cathode is developed, which will allow the use of sodium-free anodes for room-temperature sodium-sulfur (Na-S) batteries. To overcome the inert nature of the Na2S, a special cathode structure is developed by spreading the multi-walled carbon nanotube (MWCNT)-wrapped Na2S particles onto MWCNT fabrics. Spectroscopic and electrochemical analyses reveal a series of polysulfide intermediates involved in the charge/discharge of the cell. The Na-S battery prepared in full discharge state with the Na2S/MWCNT cathode provides a remarkable capacity of 500 A h kg(-1) (based on sulfur mass) after 50 cycles.
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