期刊
CARBON
卷 131, 期 -, 页码 175-183出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2018.01.100
关键词
Lithium-sulfur battery; Surface modification; Electrostatic repulsion; Zeta potential; Functionalization; Carbon scaffold
资金
- Purdue University
- Davidson School of Chemical Engineering
- Office of Naval Research under Naval Enterprise Partnership Teaming with Universities for National Excellence (NEPTUNE Phase I and II) at Purdue Center for Power and Energy Research [N00014-15-1-2833]
- Office of Vehicle Technologies of the U.S. Department of Energy [DE-EE0006832]
In order to alleviate the systemic challenges underlying in Lithium sulfur (Li-S) batteries, the surface of non-polar carbon materials have been widely modified with functional polymeric materials and metal-oxide compounds to chemically interact with polysulfides and thus improve the cycle performance of sulfur cathodes. However, the inherent low conductivity and long-term instability of functional polymers and ceramic materials impede the efficient electrochemical reactions and, in the end, deteriorate the electrochemical performances of Li-S batteries. In this study, we demonstrated a facile and effective approach to customize the surface characteristics of carbon nanotubes (CNTs) via thermal treatments under different atmospheres (oxygen and hydrogen) and exploit these properties for sulfur reservoirs and interlayer barrier in order to enhance the electrochemical performances of Li-S batteries. With the aid of different characteristics of modified CNTs, electrochemical performances of sulfur cathodes were effectively optimized in terms of specific capacity and cycling performance. In addition, when interlayers were coupled with general sulfur cathodes with high sulfur loading mass (2.5 mg cm(-1)), it also showed analogous trends in improving the specific capacity and cycle performance (250 cycles). (c) 2018 Elsevier Ltd. All rights reserved.
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