Sulfur Confined in Sub-Nanometer-Sized 2 D Graphene Interlayers and Its Electrochemical Behavior in Lithium-Sulfur Batteries

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• 作者：Dr. Wen-Cheng Du ; Dr. Juan Zhang ; Dr. Ya-Xia Yin ; Prof. Yu-Guo Guo and Prof. Li-Jun Wan
• 刊名：Chemistry – An Asian Journal
• 出版年：2016
• 出版时间：October 6, 2016
• 年：2016
• 卷：11
• 期：19
• 页码：2690-2694
• 全文大小：1331K
• ISSN：1861-471X

文摘

Microspace-confined sulfur molecules as cathodes for lithium–sulfur (Li−S) batteries have shown great significance in both scientific and technical aspects. A study of different microspace-confined sulfur will not only promote the advancement of Li−S batteries but also arouse a wide interest in sulfur chemistry and related applications. Herein, we choose two-dimensional (2D) graphene interlayer as host and construct 2D space-confined sulfur model systems by simple intercalation chemistry of graphite oxide. Two routes, including solvothermal method and interlamellar reaction approach, are developed, and sulfur can be easily intercalated into sub-nanometer-sized graphene interlayers, forming a graphene confined sulfur structure. The 2D space-confined sulfur can work well in a carbonate-based electrolyte and show similar electrochemical behaviors of small sulfur molecules, indicating the special molecular form of sulfur in graphene layers. The 2D space-confined sulfur concept will be helpful for further understanding the electrochemical character of confined sulfur molecules and designing a high-performance sulfur cathode.