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锂硫电池膨胀氧化石墨/硫复合正极材料的制备及其性能
引用本文:毛艳,张传辉,张洋,王琪,徐桂良,黄令,李君涛,孙世刚. 锂硫电池膨胀氧化石墨/硫复合正极材料的制备及其性能[J]. 无机化学学报, 2013, 29(5): 889-895
作者姓名:毛艳  张传辉  张洋  王琪  徐桂良  黄令  李君涛  孙世刚
作者单位:厦门大学化学化工学院化学系,厦门,361005
基金项目:国家“973”计划(No.2009CB220102)和国家基础科学人才培养计划(No.J1210014)资助项目。
摘    要:以棒状石墨为原料,采用改良的Hummers法与热处理制备得到膨胀氧化石墨(E-GO),利用在酸性水溶液中归中化学反应的方法合成纳米尺寸的硫颗粒,使其嵌入到膨胀氧化石墨的内部,制备了膨胀氧化石墨-硫复合材料。采用红外光谱,X-射线光电子能谱表征了膨胀氧化石墨表面官能团的存在和种类;X-射线衍射分析结果表明生成的硫属于斜方晶结构;扫描电子显微镜和透射电镜分析证明了材料中硫的均匀分布。恒电流充放电结果表明该复合正极材料的首次放电容量为1 020 mAh.g-1,100周循环之后其容量还保持在650 mAh.g-1左右;材料的倍率性能和库伦效率优异,这可能得益于小尺寸的硫在材料中均匀分布,以及表面官能团对硫的固定化作用。

关 键 词:单质硫  归中化学反应  锂硫电池  膨胀氧化石墨
收稿时间:2012-12-01
修稿时间:2013-01-06

Synthesis and Electrochemical Performance of Novel Expanded Graphite Oxide/Sulfur Composite Cathodes for Lithium-Sulfur Batteries
MAO Yan,ZHANG Chuan-Hui,ZHANG Yang,WANG Qi,XU Gui-Liang,HUANG Ling,LI Jun-Tao and SUN Shi-Gang. Synthesis and Electrochemical Performance of Novel Expanded Graphite Oxide/Sulfur Composite Cathodes for Lithium-Sulfur Batteries[J]. Chinese Journal of Inorganic Chemistry, 2013, 29(5): 889-895
Authors:MAO Yan  ZHANG Chuan-Hui  ZHANG Yang  WANG Qi  XU Gui-Liang  HUANG Ling  LI Jun-Tao  SUN Shi-Gang
Affiliation:Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China;Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China;Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China;Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China;Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China;Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China;Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China;Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China
Abstract:The expanded graphite oxides were prepared by modified Hummers method. The expanded graphite oxide/sulfur (E-GO/S) composites have been successfully prepared by a new chemical reaction method based on comproportionation in the acidic aqueous solution. FT-IR, XPS were characterized the existence of functional groups on the surface of expanded graphite oxide. XRD results showed that the as-prepared sulfur belongs to orthorhombic system. SEM and TEM results indicated the uniform distribution of the sulfur in the composite. The electrochemical test showed that the expanded graphite oxide/sulfur (E-GO/S) composites can deliver the highest discharge capacity of 1 020 mAh·g-1 at the first cycle, after 100 cycles of charge-discharge, the discharge capacity of the composites keep the capacity of ca. 650 mAh·g-1, and have the excellent rate performance and coulombic efficiency that may be attributed to the homogeneous distribution of sulfur in the composites and the chemical approach to fix sulfur and the lithium polysulfides via the chemical bonds with the functional groups on the surface of expanded graphite oxide.
Keywords:elemental sulfur  comproportionation  lithium-sulfur battery  expanded graphite oxide
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