Synergistic effect of carbon nanotube and encapsulated carbon layer enabling high-performance SnS_2-based anode for lithium storage  

作　　者：Chunwei Dong Yongjin Xia Zhijiang Su Zhihua Han Yang Dong Jingyun Chen Fei Hao Qiyao Yu Qing Jiang Jiaye Ye 

机构地区：[1]National Instituteof Clean-and-Low-Carbon Energy,Beijing 102209,China [2]Key Laboratory of Automobile Materials,Ministry of Education,School of Materials Science and Engineering,Jilin University,Changchun 130022,Jilin,China [3]State Key Laboratory of Explosion Science and Technology,School of Mechatronical Engineering,Beijing Institute of Technology,Beijing 100081,China [4]School of Chemistry and Physics,Faculty of Science,Queensland University of Technology,2 George Street,Brisbane,QLD 4000,Australia [5]Centre for Materials Science,Queensland University of Technology,2 George Street,Brisbane,QLD 4000,Australia

出　　处：《Journal of Energy Chemistry》2024年第10期700-709,I0015,共11页能源化学（英文版）

基　　金：the financial support from the Australian Research Council;Centre for Materials Science,Queensland University of Technology。

摘　　要：Tin disulfide(SnS_(2)),due to large interlayer spacing and high theoretical capacity,is regarded as a prospective anode material for lithium-ion batteries.Nevertheless,the poor electron conductivity of SnS_(2) and huge volumetric change during the lithiation/delithiation process lead to a rapid capacity decay of the battery,hindering its commercialization.To address these issues,herein,SnS_(2) is in-situ grown on the surface of carbon nanotubes(CNT)and then encapsulated with a layer of porous amorphous carbon(CNT/SnS_(2)@C)by simple solvothermal and further carbonization treatment.The synergistic effect of CNT and porous carbon layer not only enhances the electrical co nductivity of SnS_(2) but also limits the huge volumetric change to avoid the pulverization and detachment of SnS_(2).Density functional theo ry calculations show that CNT/SnS_(2)@C has high Li^(+)adsorption and lithium storage capacity achieving high reaction kinetics.Consequently,cells with the CNT/SnS_(2)@C anode exhibit a high lithium storage capacity of 837mAh/g after 100 cycles at 0.1 A/g and retaining a capacity of 529.8 mAh/g under 1.0 A/g after 1000 cycles.This study provides a fundamental understanding of the electrochemical processes and beneficial guidance to design high-performance SnS_(2)-based anodes for LIBs.

关 键 词：Lithium-ion batteries Porous amorphous carbon Carbon nanotubes SnS_(2)-based anode Density functional theory calculations 

分 类 号：TB34[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]