Defect-rich porous tubular graphitic carbon nitride with strong adsorption towards lithium polysulfides for high-performance lithium-sulfur batteries  

作　　者：Heng Ma Xin Liu Ning Liu Yan Zhao Yongguang Zhang Zhumabay Bakenov Xin Wang 

机构地区：[1]School of Materials Science and Engineering,Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology,Hebei University of Technology,Tianjin 300130,China [2]Institute of Batteries LLC,School of Engineering and Digital Sciences,National Laboratory Astana,Nazarbayev University,53 Kabanbay Batyr Avenue,Nur-Sultan 010000,Kazakhstan [3]South China Academy of Advanced Optoelectronics,International Academy of Optoelectronics at Zhaoqing,South China Normal University,Guangzhou 510006,China

出　　处：《Journal of Materials Science & Technology》2022年第20期140-147,共8页材料科学技术（英文版）

基　　金：Natural Science Foundation of Hebei Province of China(Nos.B2020202052;B2021202028);Outstanding Youth Project of Guangdong Natural Science Foundation(No.2021B1515020051);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(No.2020B0909030004);Guangdong Innovative and Entrepreneurial Team Program(No.2016ZT06C517);Science and Technology Program of Guangzhou(No.2019050001);Science and Technology Program of Zhaoqing(No.2019K038)。

摘　　要：The commercialization of the lithium-sulfur(Li-S)batteries is severely hampered by the shuttle effect and sluggish kinetics of lithium polysulfides(Li PSs).In this study,porous tubular graphitic carbon nitride(PTCN)was synthesized as the sulfur host by hydrothermal treatment,thermal shock and etching methods.By etching technology,the hollow nanotube tentacles grow on the tube wall of PTCN,the mesoporous appears on the inner wall,and a large number of nitrogen defects are introduced.The verticallyrooted hollow nanotube tentacles on the PTCN surface facilitate electron conduction for sulfur redox reactions.The hollow and porous architecture exposes plentiful active interfaces for accelerated redox conversion of polysulfide.Furthermore,the nitrogen defects in PTCN enable more excellent intrinsic conductivity,higher adsorbability and conversion catalytic activity to Li PSs.Based on the above synergetic effect,the batteries with PTCN/S cathodes realize a high discharge capacity of 504 m Ah g^(-1) at 4 C and a stable cycling behavior over 500 cycles with a low capacity decay of 0.063%per cycle.The results indicate a promising approach todesigning a high performance electrode material for Li-S batteries.

关 键 词：Lithium-sulfur batteries Porous tubular graphitic carbon nitride Sulfur host Nitrogen defects 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ127.11[化学工程—无机化工]