期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 13, 页码 3907-3911出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201410174
关键词
electrochemistry; energy storage; lithium-sulfur batteries; metallic nanosheets; metal oxides
资金
- BASF International Scientific Network for Electrochemistry and Batteries
- NSERC via a Canada Research Chair
Lithium-sulfur batteries are amongst the most promising candidates to satisfy emerging energy-storage demands. Suppression of the polysulfide shuttle while maintaining high sulfur content is the main challenge that faces their practical development. Here, we report that 2D early-transition-metal carbide conductive MXene phases-reported to be impressive supercapacitor materials-also perform as excellent sulfur battery hosts owing to their inherently high underlying metallic conductivity and self-functionalized surfaces. We show that 70 wt% S/Ti2C composites exhibit stable long-term cycling performance because of strong interaction of the polysulfide species with the surface Ti atoms, demonstrated by X-ray photoelectron spectroscopy studies. The cathodes show excellent cycling performance with specific capacity close to 1200 mA hg(-1) at a five-hour charge/discharge (C/5) current rate. Capacity retention of 80% is achieved over 400 cycles at a two-hour charge/discharge (C/2) current rate.
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