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

Heng Ma ¹Xin Liu ¹Ning Liu ¹Yan Zhao ¹Yongguang Zhang ¹Zhumabay Bakenov ²Xin Wang³

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作者信息

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
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Abstract

The commercialization of the lithium-sulfur(Li-S)batteries is severely hampered by the shuttle effect and sluggish kinetics of lithium polysulfides(LiPSs).In this study,porous tubular graphitic carbon ni-tride(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 meso-porous appears on the inner wall,and a large number of nitrogen defects are introduced.The vertically-rooted 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 con-ductivity,higher adsorbability and conversion catalytic activity to LiPSs.Based on the above synergetic effect,the batteries with PTCN/S cathodes realize a high discharge capacity of 504 mAh 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.

Key words

Lithium-sulfur batteries/Porous tubular graphitic carbon nitride/Sulfur host/Nitrogen defects

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基金项目

河北省自然科学基金(B2020202052)

河北省自然科学基金(B2021202028)

Out-standing Youth Project of Guangdong Natural Science Foundation(2021B1515020051)

Program for the Outstanding Young Talents of Hebei Province,China()

Chunhui Project of Min-istry of Education of the People's Republic of China(Z2017010)

Department of Science and Technology of Guangdong Province(2020B0909030004)

Guangdong Innovative and Entrepreneurial Team Program(2016ZT06C517)

Science and Technology Pro-gram of Guangzhou(2019050001)

Science and Technology Program of Zhaoqing(2019K038)

出版年

2022

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量49

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