Hierarchically Structured Sulfur/Carbon Nanocomposite Material for High-Energy Lithium Battery

被引:812
作者
Liang, Chengdu [1 ]
Dudney, Nancy J. [2 ]
Howe, Jane Y. [2 ]
机构
[1] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
[2] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA
关键词
SULFUR ELECTRODE; MESOPOROUS CARBONS; ELECTROCHEMICAL PERFORMANCE; COMPOSITE; CATHODE;
D O I
10.1021/cm902050j
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report herein a hierarchically structured sulfur-carbon (S/C) nanocomposite material as the high surface-area cathode for rechargeable lithium batteries. A porous carbon with a uniform distribution of mesopores of 7.3 nm has been synthesized through a soft-template synthesis method. The potassium hydroxide activation of this mesoporous carbon results in a bimodal porous carbon with added microporosity of less than 2 nm to the existing mesopores without deterioration of the integrity of the original mesoporous carbon. Elemental sulfur has been loaded to the micropores through a solution infiltration method. The resulted S/C composites with various loading level or sulfur have a high surface areas and large internal porosities. These materials have been tested as novel cathodes for Li/S batteries. The results show that the cyclability and the utilization of sulfur in the Li/S batteries have been significantly improved. The large internal porosity and Surface area of the micromesoporous carbon is essential for the high utilization of sulfur.
引用
收藏
页码:4724 / 4730
页数:7
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