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- Title
Sulfur Cathodes Based on Conductive MXene Nanosheets for High-Performance Lithium-Sulfur Batteries.
- Authors
Liang, Xiao; Garsuch, Arnd; Nazar, Linda F.
- Abstract
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 h g−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.
- Subjects
LITHIUM sulfur batteries; PERFORMANCE of storage batteries; SUPERCAPACITORS; ELECTRIC conductivity; X-ray photoelectron spectroscopy; POLYSULFIDES
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 13, p3979
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201410174