Two-dimensional vermiculite separator for lithium sulfur batteries  

作　　者：Rui Xu Yingzhi Sun Yunfei Wang Jiaqi Huang Qiang Zhang 

机构地区：[1]Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China [2]School of Materials Science&Engineering,Beijing Institute of Technology,Beijing 100081,China [3]Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China [4]School of Materials Science&Engineering,Tsinghuo University,Beijing 100084,Chino [5]Department of Materials Science-and Engineering,Johns Hopkins University.Baltimore,MD 21218-2608,USA

出　　处：《Chinese Chemical Letters》2017年第12期2235-2238,共4页中国化学快报（英文版）

基　　金：supported by National Key Research and Development Program(Nos.2016YFA0202500 and 2016YFA0200102);the National Natural Scientific Foundation of China(No.21776019);Young Elite Scientists Sponsorship Program by CAST(No.YESS20150133)

摘　　要：Lithium-sulfur batteries have been considered as one of the most promising battery system for their high theoretical energy density. However, the lithium-sulfur batteries suffer from the dissolution and diffusion of polysulfides, which induce parasitic reactions with lithium metal anodes. The safety of lithium-sulfur batteries is also concerned with the risk of dendrite growth on lithium metal anodes. To simultaneously address the challenges in the shuttle effect and safety problems, we demonstrate herein a two-dimensional vermiculite separator. With the assembly of the 2D exfoliated vermiculite sheets, the vermiculite separator can suppress the diffusion of polysulfides across the separator through electrostatic interaction and steric hindrance. Meanwhile, the inorganic sheets with high strength and Young＇s modulus prevent the penetration of lithium metal dendrite and potentially improve the safety of the system. This work elucidates a promising strategy for safe and stable lithium sulfur batteries, and can also be extended to other electrochemical systems based on metal anodes.Lithium-sulfur batteries have been considered as one of the most promising battery system for their high theoretical energy density. However, the lithium-sulfur batteries suffer from the dissolution and diffusion of polysulfides, which induce parasitic reactions with lithium metal anodes. The safety of lithium-sulfur batteries is also concerned with the risk of dendrite growth on lithium metal anodes. To simultaneously address the challenges in the shuttle effect and safety problems, we demonstrate herein a two-dimensional vermiculite separator. With the assembly of the 2D exfoliated vermiculite sheets, the vermiculite separator can suppress the diffusion of polysulfides across the separator through electrostatic interaction and steric hindrance. Meanwhile, the inorganic sheets with high strength and Young＇s modulus prevent the penetration of lithium metal dendrite and potentially improve the safety of the system. This work elucidates a promising strategy for safe and stable lithium sulfur batteries, and can also be extended to other electrochemical systems based on metal anodes.

关 键 词：VermiculiteSeparatorLithium sulfur batteriesPolysulfidesShuttle effectCoulombic efficiency 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ051.8[化学工程]