期刊
RSC ADVANCES
卷 6, 期 1, 页码 617-622出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra24338f
关键词
-
资金
- National Natural Science Foundation of China [51225204, 91127044, U1301244]
- National Basic Research Program of China [2013AA050903, 2012CB932900]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09010000]
The commercial applications of lithium-sulfur batteries are hindered by several issues including the poor electronic/ionic conductivity of sulfur and discharge products, the dissolution of lithium polysulfides in organic electrolytes, and the volume change during charge/discharge processes. In this study, a three-dimensional (3-D) sandwich-type graphene@microporous carbon (G@MC) architecture with large pore volume (2.65 cm(3) g(-1)) and ultrahigh surface area (3374 m(2) g(-1)) was designed to encapsulate sulfur and polysulfides in the hierarchical microporous structure. The G@MC materials with a lot of sp(2) hybrid carbon atoms can provide 3-D electron transfer pathways for sulfur and discharge products. Furthermore, the G@MC materials with the novel hierarchical structure can absorb a lot of polysulfides and restrain the polysulfide diffusion, and provide adequate nanospace for sulfur expansion ensuring the structural integrity during the cycling. Thus, the optimized G@MC-S nanocomposite with high sulfur loading (75.4 wt%) retains a discharge capacity of 541.3 mA h g(-1) after 500 cycles at 0.5C. This design strategy is simple and broadly applicable, providing new opportunities for materials design that can be extended to various electrode materials.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据