期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 12, 页码 3982-3986出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201511632
关键词
electrochemical performance; double-shelled nanocages; layered double hydroxides; lithium-sulfur batteries; nanostructures
资金
- Ministry of Education (Singapore) through AcRF [RG12/14, M4011258]
Lithium-sulfur (Li-S) batteries have been considered as a promising candidate for next-generation electrochemical energy-storage technologies because of their overwhelming advantages in energy density. Suppression of the polysulfide dissolution while maintaining a high sulfur utilization is the main challenge for Li-S batteries. Here, we have designed and synthesized double-shelled nanocages with two shells of cobalt hydroxide and layered double hydroxides (CH@LDH) as a conceptually new sulfur host for Li-S batteries. Specifically, the hollow CH@LDH polyhedra with complex shell structures not only maximize the advantages of hollow nanostructures for encapsulating a high content of sulfur (75wt%), but also provide sufficient self-functionalized surfaces for chemically bonding with polysulfides to suppress their outward dissolution. When evaluated as cathode material for Li-S batteries, the CH@LDH/S composite shows a significantly improved electrochemical performance.
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