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Porous Graphitic Carbon Loading Ultra High Sulfur as High-Performance Cathode of Rechargeable Lithium-Sulfur Batteries
被引:111
作者:
Xu, Gui-Liang
[1
]
Xu, Yue-Feng
[1
]
Fang, Jun-Chuan
[1
]
Peng, Xin-Xing
[1
]
Fu, Fang
[1
]
Huang, Ling
[1
]
Li, Jun-Tao
[1
]
Sun, Shi-Gang
[1
]
机构:
[1] Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China
关键词:
porous graphitic carbon;
sulfur/carbon composite;
high sulfur loading;
ovreall capacity;
BP2000;
Li-S batteries;
LI-S BATTERIES;
HIGH-CAPACITY;
ELECTROCHEMICAL PERFORMANCE;
MESOPOROUS CARBON;
GRAPHENE OXIDE;
ENCAPSULATED SULFUR;
COMPOSITE CATHODES;
CELLS;
EFFICIENCY;
ELECTROLYTES;
D O I:
10.1021/am402970x
中图分类号:
TB3 [工程材料学];
学科分类号:
0805 ;
080502 ;
摘要:
Porous graphitic carbon of high specific surface area of 1416 m(2) g(-1) and high pore volume of 1.11 cm(3) g(-1) is prepared by using commercial CaCO3 nanoparticles as template and sucrose as carbon source followed by 1200 degrees C high-temperature calcination. Sulfur/porous graphitic carbon composites with ultra high sulfur loading of 88.9 wt % (88.9%S/PC) and lower sulfur loading of 60.8 wt % (60.8%S/PC) are both synthesized by a simple melt-diffusion strategy, and served as cathode of rechargeable lithium-sulfur batteries. In comparison with the 60.8%S/PC, the 88.9%S/PC exhibits higher overall discharge capacity of 649.4 mAh g((S-C))(-1), higher capacity retention of 84.6% and better coulombic efficiency of 97.4% after 50 cycles at a rate of 0.1C, which benefits from its remarkable specific capacity with such a high sulfur loading. Moreover, by using BP2000 to replace the conventional acetylene black conductive agent, the 88.9% S/PC can further improve its overall discharge capacity and high rate property. At a high rate of 4C, it can still deliver an overall discharge capacity of 387.2 mAh g((S-C))(-1). The porous structure, high specific surface area, high pore volume and high electronic conductivity that is originated from increased graphitization of the porous graphitic carbon can provide stable electronic and ionic transfer channel for sulfur/porous graphitic carbon composite with ultra high sulfur loading, and are ascribed to the excellent electrochemical performance of the 88.9%S/PC.
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页码:10782 / 10793
页数:12
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