Confining sulfur in sandwich structure of bamboo charcoal and aluminum fluoride(BC@S@AlF3) as a long cycle performance cathode for Li-S batteries  

作　　者：Zhenya Luo Xiao Wang Weixin Lei Pengtao Xia Yong Pan 

机构地区：[1]National-Provincial Laboratory of Special Function Thin Film Materials,Xiangtan University,Xiangtan,Hunan 411105,China [2]School of Materials Science and Engineering,Xiangtan University,Xiangtan,Hunan 411105,China

出　　处：《Journal of Materials Science & Technology》2020年第20期159-166,共8页材料科学技术（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.11602213);the Natural Science Foundation of Hunan province,China(Grant No.2019JJ50578)。

摘　　要：The ’shuttle effect’ of polysulfide causing rapid capacity fade and low coulo mbic efficiency of high ene rgy storage lithium-sulfur(Li-S) batteries.Herein,a sandwich structure of bamboo charcoal/sulfur coating by aluminum fluoride(BC@S@AlF3) composites is designed and fabricated for the first time.The as-designed cathode exhibited excellent electrochemical properties and stable capacity retention.The initial capacity reaches 1119 mA h/g and the capacity after 100 cycles is 869 mA h/g at 0.5 C,which is much stable than that of composite materials without bamboo charcoal or AlF3 coating.Moreover,the BC@S@AlF3 cathode presents excellent long-term capacity stability with a capacity decay of 0.073% per cycle during 500 charge/discharge cycles at 1 C,offering a potential for use in high energy Li-S batteries.The physical confinement,chemical ancho ring,and catalysis conversion for active sulfur are achieved simultaneously with the AlF3 coating and bamboo charcoal core with porous structure.

关 键 词：AlF3 coating Strong polarity Sulfur immobilizers Lithium-sulfur batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]