All Inorganic Frameworks of Tin Dioxide Shell as Cathode Material for Lithium Sulfur Batteries with Improved Cycle Performance

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• 作者：Lu Ping Zhang ; Ye Feng Wang ; Si Qiong Gou ; Jing Hui Zeng
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：December 31, 2015
• 年：2015
• 卷：119
• 期：52
• 页码：28721-28727
• 全文大小：432K
• ISSN：1932-7455

文摘

SnO₂ shells with micromesopores are synthesized using the template sacrifice method from silica sphere templates. The pores and specific surface area are characterized with SEM, TEM, and BET absorptions. Sulfur is introduced into the SnO₂ shells up to 66 wt % according to TGA results. Extra sulfur can only be located at the outer surface of SnO₂, resulting in a drastically reduced specific surface area. Because of the unique structure, the S/SnO₂ composites with 66 wt % sulfur content exhibit a high initial capacity of 1517 mA·h·g^–1 at a current density of 0.2 C, and 1176 mA·h·g^–1 at 0.5 C, and remaining capacity of 1176 and 736.6 mA·h·g^–1 after 50 cycles, respectively. The performance is much better than that of pure sulfur or S/SnO₂ at higher sulfur content. Better performance of S/SnO₂ at 66 wt % is attributed to the micromesopores and the shell framework of SnO₂, while the performance fading at higher sulfur content is owing to the coating of extra sulfur on the outer surface of SnO₂ shells.