Oxidized Nb_(2)C MXene as catalysts for lithium-sulfur batteries:Mitigating the shuttle phenomenon by facilitating catalytic conversion of lithium polysulfides  

作　　者：Cailing Song Wen Zhang Qianwen Jin Yan Zhao Yongguang Zhang Xin Wang Zhumabay Bakenov 

机构地区：[1]School of Materials Science and Engineering,State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,Tianjin 300130,China [2]South China Academy of Advanced Optoelectronics&International Academy of Optoelectronics at Zhaoqing,South China Normal University,Guangzhou 510006,China [3]Department of Chemical and Materials Engineering,National Laboratory Astana,Institute of Batteries LLP,Nazarbayev University,Nur-Sultan 010000,Kazakhstan

出　　处：《Journal of Materials Science & Technology》2022年第24期45-52,共8页材料科学技术（英文版）

基　　金：supported by Natural Science Foundation of Hebei Province of China(Nos.B2021202028,B2020202052,B2019202277);Outstanding Youth Project of Guangdong Natural Science Foundation(No.2021B1515020051);State Key Laboratory of Reliability and Intelligence of Electrical Equipment(No.EERI_PI2020007);Hebei University of Technology,China;the Program for the Outstanding Young Talents of Hebei Province,China(YG.Z.);Chunhui Project of Ministry of Education of the People’s Republic of China(No.Z2017010);Department of Science and Technology of Guangdong Province(Nos.2020B0909030004,2019JC01L203);Guangdong Innovative and Entrepreneurial Team Program(No.2016ZT06C517);Science and Technology Program of Guangzhou(No.2019050001);Science and Technology Program of Zhaoqing(No.2019K038);project AP09259764“Engineering of Multifunctional Materials of Next Generation Batteries”from the Ministry of Education and Science of Kazakhstan;a research project FDCRP No.110119FD4504“Development of 3D solid state thin film materials for durable and safe Li-ion microbatteries”from Nazarbayev University。

摘　　要：Extensive research has been devoted to lithium-sulfur(Li-S)batteries due to their overwhelming promises and advantages such as high theoretical capacity(1675 m Ah g^(-1)),extremely cost effectiveness and abundance and availability of sulfur.Nevertheless,a sluggish electrochemical kinetics of the battery limited by a slow conversion of lithium polysulfide(LiPSs)intermediates and Li PSs shuttle effect severely hinder its development towards industrial application.Herein,we designed the oxidized Nb2_(C)MXene with amorphous carbon(Nb_(2)O_(5)/C)composites as sulfur host using CO_(2)treatment to address the above issues.The Nb_(2)O_(5)/C composites with high conductivity are directly employed as sulfur hosts for Li-S battery capable to remarkably mitigate the shuttle phenomenon due to a combined effect of their Li PSs trapping ability and catalytic activity towards their accelerated conversion.Meanwhile,the unique layered structure of the composite facilitates ion transfer and accommodates the volume changes of the cathode during cycling.With this rational design,the resultant Li-S batteries exhibit superior electrochemical performance with a high initial specific capacity of 745 m Ah g^(-1)at 1.0 C and a reversible capacity of 620 m Ah g^(-1)at a high rate cycling at 3.0 C.

关 键 词：Oxidized Nb_(2)C MXene Li-S batteries Lithium polysulfides conversion Electrochemical performance 

分 类 号：TM912[电气工程—电力电子与电力传动] O643.36[理学—物理化学]