Yolk鈥揝hell Structure of Polyaniline-Coated Sulfur for Lithium鈥揝ulfur Batteries

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• 作者：Weidong Zhou ; Yingchao Yu ; Hao Chen ; Francis J. DiSalvo ; H茅ctor D. Abru帽a
• 刊名：Journal of the American Chemical Society
• 出版年：2013
• 出版时间：November 6, 2013
• 年：2013
• 卷：135
• 期：44
• 页码：16736-16743
• 全文大小：646K
• 年卷期：v.135,no.44(November 6, 2013)
• ISSN：1520-5126

文摘

Lithium鈥搒ulfur batteries have attracted much attention in recent years due to their high theoretical capacity of 1672 mAh g^鈥? and low cost. However, a rapid capacity fade is normally observed, attributed mainly to polysulfide dissolution and volume expansion. Although many strategies have been reported to prolong the cyclability, the high cost and complex preparation processes still hinder their practical application. Here, we report the synthesis of a polyaniline鈥搒ulfur yolk鈥搒hell nanocomposite through a heating vulcanization of a polyaniline鈥搒ulfur core鈥搒hell structure. We observed that this heating treatment was much more effective than chemical leaching to prepare uniform yolk鈥搒hell structures. Compared with its sulfur鈥損olyaniline core鈥搒hell counterparts, the yolk鈥搒hell nanostructures delivered much improved cyclability owing to the presence of internal void space inside the polymer shell to accommodate the volume expansion of sulfur during lithiation. The yolk鈥搒hell material exhibited a stable capacity of 765 mAh g^鈥? at 0.2 C after 200 cycles, representing a promising future for industrial scale Li鈥揝 batteries.