期刊
FRONTIERS IN CHEMISTRY
卷 6, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2018.00429
关键词
in situ generated sulfur; nitrogen doped carbon; cathode; chemical anchoring; physical trapping; lithium-sulfur batteries
资金
- National Natural Science Foundation of China [51572100, 51504171]
- Major project of Technology Innovation of Hubei Province [2018AAA011]
Lithium-sulfur batteries (LSBs), with large specific capacity (1,675 mAh g(-1)), are regarded as the most likely alternative to the traditional Lithium-ion batteries. However, the intrinsical insulation and dramatic volume change of sulfur, as well as serious shuttle effect of polysulfides hinder their practical implementation. Herein, we develop three-dimensional micron flowers assembled by nitrogen doped carbon (NC) nanosheets with sulfur encapsulated (S@NC-NSs) as a promising cathode for Li-S to overcome the forementioned obstacles. The in situ generated S layer adheres to the inner surface of the hollow and micro-porous NC shell with fruitful O/N containing groups endowing both efficient physical trapping and chemical anchoring of polysulfides. Meanwhile, such a novel carbon shell helps to bear dramatic volume change and provides a fast way for electron transfer during cycling. Consequently, the S@NC-NSs demonstrate a high capacity (1,238 mAh g(-1) at 0.2 C; 1.0 C = 1,675 mA g(-1)), superior rate performance with a capacity retention of 57.8% when the current density increases 25 times from 0.2 to 5.0 C, as well as outstanding cycling performance with an ultralow capacity fading of only 0.064% after 200 cycles at a high current density of 5.0 C.
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