Polyaniline-modified cetyltrimethylammonium bromide- graphene oxide-sulfur nanocomposites with enhanced performance for lithium-sulfur batteries

作     者：Yongcai Qiu Wanfei Li Guizhu Li Yuan Hou Lisha Zhou Hongfei Li Meinan Liu Fangmin Ye Xiaowei Yang Yuegang Zhang 

作者机构：i-LAB Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2014年第7卷第9期

页      面：1355-1363页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：国家自然科学基金 Suzhou Science and Technology Development Program 江苏省自然科学基金 中国博士后科学基金 

主　　题：polyaniline graphene oxide-sulfur lithium-sulfur batteries long-term cycling 

摘      要：Conductive polymer coatings can boost the power storage capacity of lithiumsulfur batteries. We report here on the design and preparation--by combining a facile and green chemical deposition method with an oxidative polymerization approach--of polyaniline （PANI）-modified cetyltrimethylammonium bromide （CTAB）-graphene oxide （GO）-sulfur （S） nanocomposites with significantly enhanced performance in lithium-sulfur batteries. Such conductive polymer modified CTAB-GO-S nanocomposites as sulfur cathode materials can deliver high specific discharge capacities and long-term cycling performance, i.e., -970 mAh-g-1 at 0.2 C and -715 mAh-g-1 after 300 cycles, -820 mAh.g-1 at 0.5 C and -670 mAh.g-1 after 500 cycles, -770 mAh.K at 1 C and -570 mAh.g-~ after 500 cycles. The capacity decay was as low as 0.036% per cycle at 0.5 C, and 0.051% per cycle at 1 C. Under the same condition, batteries using PANI-modified CTAB-GO-S as cathodes exhibited higher specific capacity and higher average coulombic efficiency compared with CTAB-decorated GO-S and GO--S nano- composites. The improved performance can be attributed to the lower charge transfer resistance and the alleviated dissolution of polysulfides in the PANI- modified CTAB-GO-S cathodes.