Facile synthesis of Li2S@C composites as cathode for Li–S batteries  

作　　者：Xin Chen Linfeng Peng Lixia Yuan Rui Zeng Jingwei Xiang Weilun Chen Kai Yuan Jie Chen Yunhui Huang Jia Xie 

机构地区：[1]State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China [2]State Key Laboratory of Materials Processing and Die & Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China

出　　处：《Journal of Energy Chemistry》2019年第10期111-116,共6页能源化学（英文版）

基　　金：supported by the National Basic Research Program of China (973 Program, 2015CB258400);the National Science Foundation of China (Grant Nos. 21773077 and 51532005);the Program for HUST Interdisciplinary Innovation Team (2015ZDTD021)

摘　　要：Lithium sulfide (Li2S) provides a promising route for lithium storage due to high theoretical specific capacity (1166 mAh g-1). The electrochemical performance of Li2S can be significantly enhanced by forming Li2S-carbon composites with the introduction of carbon. However, the complex synthesis method of Li2S-carbon composites restrains the large-scale productivity. Herein, we propose a facile route to prepare carbon coated Li2S-carbon nanotube composites (Li2S@C-CNT) via spray drying and heat treatment, which is a low-cost and large-scale method for facile synthesis of Li2S-carbon composites. For the Li2S@C-CNT composites, Li2S nanoparticles are contacted with surrounding particles due to the 3D CNTs framework. The novel construction not only suppresses the diffusion of polysulfides during cycling, but also remarkably accelerates the transport of electron and ion, resulting in a high specific capacity (1100 mAh g^-1) and good cycling performance. The rational designed architecture and good electrochemical performance of Li2S@C-CNT will pave the avenue for realizing high energy density of Li2S-based batteries.Lithium sulfide（Li2S） provides a promising route for lithium storage due to high theoretical specific capacity(1166 m Ah g-1). The electrochemical performance of Li2S can be significantly enhanced by forming Li2S–carbon composites with the introduction of carbon. However, the complex synthesis method of Li2S–carbon composites restrains the large-scale productivity. Herein, we propose a facile route to prepare carbon coated Li2S–carbon nanotube composites（Li2S@C-CNT） via spray drying and heat treatment, which is a low-cost and large-scale method for facile synthesis of Li2S–carbon composites. For the Li2S@C-CNT composites, Li2S nanoparticles are contacted with surrounding particles due to the 3D CNTs framework.The novel construction not only suppresses the diffusion of polysulfides during cycling, but also remarkably accelerates the transport of electron and ion, resulting in a high specific capacity(1100 m Ah g-1)and good cycling performance. The rational designed architecture and good electrochemical performance of Li2S@C-CNT will pave the avenue for realizing high energy density of Li2S-based batteries.

关 键 词：SPRAY DRYING Li2S@C-CNT Lithium-sulfur BATTERIES 

分 类 号：O4[理学—物理]