期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 23, 页码 10891-10897出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta02911c
关键词
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资金
- National Natural Science Foundation of China (NSFC) [81503351, 81760750]
- Natural Science Foundation of Inner Mongolia PR China [2012MS1209]
- Inner Mongolia Autonomous Region University
- Youth Science and technology talent support program [NJYT-18-A09]
Despite their advantages of high theoretical capacity and energy density, lithium-sulfur (Li-S) batteries still suffer from poor electrochemical performance resulting from the accelerated shuttle effect of polysulfides and the intrinsically low electroactivity of elemental sulfur. Herein, we report an ideal core-shell sulfur host material based on core-shell carbon encapsulated multi-chambered carbon nanospheres (MCCN@C) for Li-S batteries. The hierarchical and micro-mesoporous core in MCCN@C can allow a high sulfur loading (83.1 wt%) and serve as the physical barrier to block the polysulfide dissolution, and the carbon shell can provide additional physical confinements for improving the retention of soluble polysulfides. Moreover, the well-designed conductive networks of the MCCN@C material interconnected by carbon chambers can promote fast electron transfer and electrolyte penetration. In Li-S batteries, MCCN-S@C composite cathodes deliver significantly enhanced electrochemical performance with a high reversible capacity of 1163 mA h g(-1) at 0.2C after 100 cycles, remarkable rate capability (626 mA h g(-1) at 5.0C) and ultrahigh long-term cycle stability at high rates (651 mA h g(-1) after 1000 cycles at 2.0C with 0.032% capacity decay per cycle). More importantly, the MCCN@C-S composite cathode with 3.6 mg cm(-2) sulfur also delivers a high and stable electrochemical performance over 200 cycles.
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