A Highly Ordered Meso@Microporous Carbon-Supported Sulfur@Smaller Sulfur Core鈥揝hell Structured Cathode for Li鈥揝 Batteries
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- 作者：Zhen Li ; Yan Jiang ; Lixia Yuan ; Ziqi Yi ; Chao Wu ; Yang Liu ; Peter Strasser ; Yunhui Huang
- 刊名：ACS Nano
- 出版年：2014
- 出版时间：September 23, 2014
- 年：2014
- 卷：8
- 期：9
- 页码：9295-9303
- 全文大小：807K
- ISSN：1936-086X
文摘
For lithium鈥搒ulfur batteries, commercial application is hindered by the insulating nature of sulfur and the dissolution of the reaction intermediates of polysulfides. Here, we present an ordered meso-microporous core鈥搒hell carbon (MMCS) as a sulfur container, which combines the advantages of both mesoporous and microporous carbon. With large pore volume and highly ordered porous structure, the 鈥渃ore鈥?promises a sufficient sulfur loading and a high utilization of the active material, while the 鈥渟hell鈥?containing microporous carbon and smaller sulfur acts as a physical barrier and stabilizes the cycle capability of the entire S/C composite. Such a S/MMCS composite exhibits a capacity as high as 837 mAh g鈥? at 0.5 C after 200 cycles with a capacity retention of 80% vs the second cycle (a decay of only 0.1% per cycle), demonstrating that the diffusion of the polysulfides into the bulk electrolyte can be greatly reduced. We believe that the tailored highly ordered meso-microporous core鈥搒hell structured carbon can also be applicable for designing some other electrode materials for energy storage.