期刊
ADVANCED MATERIALS
卷 29, 期 34, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201702707
关键词
carbon nanoboxes; lithium-sulfur batteries; polar metal oxides; sulfur cathodes; yolk-shelled structures
类别
资金
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials U.S. Department of Energy [DE-SC000597]
- China Scholarship Council [201606070032]
Owing to the high theoretical specific capacity (1675 mA h g(-1)) and low cost, lithium-sulfur (Li-S) batteries offer advantages for next-generation energy storage. However, the polysulfide dissolution and low electronic conductivity of sulfur cathodes limit the practical application of Li-S batteries. To address such issues, well-designed yolk-shelled carbon@Fe3O4 (YSC@Fe3O4) nanoboxes as highly efficient sulfur hosts for Li-S batteries are reported here. With both physical entrapment by carbon shells and strong chemical interaction with Fe3O4 cores, this unique architecture immobilizes the active material and inhibits diffusion of the polysulfide intermediates. Moreover, due to their high conductivity, the carbon shells and the polar Fe3O4 cores facilitate fast electron/ion transport and promote continuous reactivation of the active material during the charge/discharge process, resulting in improved electrochemical utilization and reversibility. With these merits, the S/YSC@Fe3O4 cathodes support high sulfur content (80 wt%) and loading (5.5 mg cm(-2)) and deliver high specific capacity, excellent rate capacity, and long cycling stability. This work provides a new perspective to design a carbon/metal-oxide-based yolk-shelled framework as a high sulfur-loading host for advanced Li-S batteries with superior electrochemical properties.
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