A Facile Synthesis of High-Surface-Area Sulfur-Carbon Composites for Li/S Batteries

被引:20
作者
Kaiser, Mohammad Rejaul [1 ]
Liang, Xin [1 ]
Konstantinov, Konstantin [1 ]
Liu, Hua-Kun [1 ]
Dou, Shi-Xue [1 ]
Wang, Jia-Zhao [1 ]
机构
[1] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia
关键词
carbon; discharge capacity; spray precipitation; sulfur; sulfur-carbon composite; CATHODE MATERIAL; ELECTROCHEMICAL PROPERTIES; POLYPYRROLE COMPOSITE; HIGH-CAPACITY; LONG-LIFE; LITHIUM; PERFORMANCE; ELECTRODE; NANOTUBES;
D O I
10.1002/chem.201500429
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Small-grained elemental sulfur is precipitated from sodium thiosulfate (Na2S2O3) in a carbon-containing oxalic acid (HOOCCOOH) solution through a novel spray precipitation method. Surface area analysis, elemental mapping, and transmission electron micrographs revealed that the spray-precipitated sulfur particles feature 11 times higher surface area compared to conventional precipitated sulfur, with homogeneous distribution in the carbon. Moreover, the scanning electron micrographs show that these high-surface-area sulfur particles are firmly adhered to and covered by carbon. This precipitated S-C composite exhibits high discharge capacity with about 75% capacity retention. The initial discharge capacity was further improved to 1444mAhg(-1) by inserting a free-standing single-walled carbon nanotube layer in between the cathode and the separator. Moreover, with the help of the fixed capacity charging technique, 91.6% capacity retention was achieved.
引用
收藏
页码:10061 / 10069
页数:9
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