3D Hierarchically Interconnected Porous Graphene Containing Sulfur for Stable High Rate Li-S Batteries

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• 作者：Weiwei Qian ; Prof. Dr. Qiuming Gao ; Kai Yang ; Weiqian Tian ; Yanli Tan ; Chunxiao Yang ; Hang Zhang ; Zeyu Li and Lihua Zhu
• 刊名：Energy Technology
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：4
• 期：5
• 页码：625-632
• 全文大小：1807K
• ISSN：2194-4296

文摘

A simple strategy for the reduction of graphene oxide by annealing was used to produce 3D hierarchically interconnected porous graphene (HIPG) samples. The optimized HIPG-900 sample possessing a specific surface area of 367.4 m² g⁻¹ and pore volume of 1.3 cm³ g⁻¹ contains a large amount of sulfur (65.8 wt %) and improves the utilization of sulfur when used as the cathode of Li–S batteries. A high initial specific discharge capacity of 914.1 mAh g⁻¹ and a specific capacity of 486.0 mAh g⁻¹ after 500 cycles was obtained for HIPG-900/S composites at 1C. A high specific capacity of 467.2 and 162.4 mAh g⁻¹ was obtained at a high rate of 10C with a Coulombic efficiency of over 90.0 % at the 1st and 500th cycle, respectively.