Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 12, Pages 7074-7081Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta12403e
Keywords
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Funding
- Ministry of Science and Technology of China [2018YFA0209102]
- National Natural Science Foundation of China [51601040, 11727807, 51725101, 51672050, 61790581]
- Science and Technology Commission of Shanghai Municipality [16DZ2260600]
- China Postdoctoral Science Foundation [2018M640337]
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Building a sulfur host cathode with high electronic transfer ability and strong confinement effect towards intermediate polysulfide is pivotal to develop advanced lithium-sulfur (Li-S) batteries. Herein, a MOF-driven strategy has been employed to synthesize a hierarchical architecture constructed by rooting bismuth oxide nanosheets into Co/N-co-doped porous carbon nanoboxes (Bi2O3@Co/N-PC). After a process of sulfur infiltration, the hierarchical architecture turns into a hybrid composed of sulfur embedded within the Bi2O3@Co/N-PC host (Bi2O3@Co/N-PC@S). When used as the cathode material for Li-S batteries, the as-prepared Bi2O3@Co/N-PC@S not only exhibits a high initial discharge capacity of 1302 mA h g(-1) at a current density of 0.25 C, but also maintains a capacity of 732 mA h g(-1) after 500 cycles at the current density of 1.5 C. Moreover, the high rate test also demonstrates its exceptional rate capability with a capacity as high as 451 mA h g(-1) after 1500 cycles at the current density of 10 C. Such excellent performance can be attributed to the high conductivity and favourable surface structure of the Co/N-doped carbon framework as well as its strong charge coupling with bismuth oxide nanosheets, resulting in low polarization, fast redox reaction kinetics, and high immobilization ability towards intermediate polysulfide.
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