Electrochemical performance of sulfur composite cathode materials for rechargeable lithium batteries

作     者：Feng Wu Sheng Xian Wu Ren Jie Chen Shi Chen Guo Qing Wang 

作者机构：School of Chemical Engineering and Environment Beijing Institute of TechnologyBeijing Key Laboratory of Environmental Science and Engineering Beijing 100081 China National Development Center for High Technology Green Material Beijing 100081 China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2009年第20卷第10期

页      面：1255-1258页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 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] 081002[工学-信号与信息处理] 

基　　金：supported by the National Key Program for Basic Research of China(No. 2009CB220100) the National 863 Program(No.2007AA03Z226) 

主　　题：Sulfur composite Cathode materials Activated carbon Electrochemical performance 

摘      要：The structure and characteristic of carbon materials have a direct influence on the electrochemical performance of sulfur-carbon composite electrode materials for lithium-sulfur battery. In this paper, sulfur composite has been synthesized by heating a mixture of elemental sulfur and activated carbon, which is characterized as high specific surface area and microporous structure. The composite, contained 70% sulfur, as cathode in a lithium cell based on organic liquid electrolyte was tested at room temperature. It showed two reduction peaks at 2.05 V and 2.35 V, one oxidation peak at 2.4 V during cyclic voltammogram test. The initial discharge specific capacity was 1180.8 mAh g-1 and the utilization of electrochemically active sulfur was about 70.6% assuming a complete reaction to the product of Li2S. The specific capacity still kept as high as 720.4 mAh g^-1 after 60 cycles retaining 61% of the initial discharge capacity.