Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 42, Pages 12990-12995Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201605676
Keywords
lithium-sulfur batteries; polysulfides; porous graphene frameworks; shuttle effect; titanium carbide
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Funding
- Natural Scientific Foundation of China [21306103, 21422604, 21561130151]
- Tsinghua University Initiative Scientific Research Program [20161080166]
- Ministry of Science and Technology of the People's Republic of China [2015CB932500, 2016YFA0202500]
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Lithium-sulfur (Li-S) batteries have been recognized as promising substitutes for current energy-storage technologies owing to their exceptional advantage in energy density. The main challenge in developing highly efficient and long-life Li-S batteries is simultaneously suppressing the shuttle effect and improving the redox kinetics. Polar host materials have desirable chemisorptive properties to localize the mobile polysulfide intermediates; however, the role of their electrical conductivity in the redox kinetics of subsequent electrochemical reactions is not fully understood. Conductive polar titanium carbides (TiC) are shown to increase the intrinsic activity towards liquid-liquid polysulfide interconversion and liquid-solid precipitation of lithium sulfides more than non-polar carbon and semiconducting titanium dioxides. The enhanced electrochemical kinetics on a polar conductor guided the design of novel hybrid host materials of TiC nanoparticles grown within a porous graphene framework (TiC@G). With a high sulfur loading of 3.5 mg cm(-2), the TiC@G/sulfur composite cathode exhibited a substantially enhanced electrochemical performance.
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