Fluorine-Modulated MXene-Derived Catalysts for Multiphase Sulfur Conversion in Lithium-Sulfur Battery  

作　　者：Qinhua Gu Yiqi Cao Junnan Chen Yujie Qi Zhaofeng Zhai Ming Lu Nan Huang Bingsen Zhang 

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,People’s Republic of China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,People’s Republic of China [3]The Joint Laboratory of MXene Materials,Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education,Key Laboratory of Preparation and Application of Environmental Friendly Materials of the Ministry of Education,Jilin Normal University,Changchun 130103,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第12期201-216,共16页纳微快报（英文版）

基　　金：the financial support provided by the National Natural Science Foundation of China(Nos.51932005,22072164);Liaoning Revitalization Talents Program(No.XLYC1807175);the Research Fund of Shenyang National Laboratory for Materials Science,the Natural Science Foundation of Jilin Province(Nos.YDZJ202301ZYTS280,YDZJ202201ZYTS305,YDZJ202401316ZYTS).

摘　　要：Fluorine owing to its inherently high electronegativity exhibits charge delocalization and ion dissociation capabilities;as a result,there has been an influx of research studies focused on the utilization of fluorides to optimize solid electrolyte interfaces and provide dynamic protection of electrodes to regulate the reaction and function performance of batteries.Nonetheless,the shuttle effect and the sluggish redox reaction kinetics emphasize the potential bottlenecks of lithium-sulfur batteries.Whether fluorine modulation regulate the reaction process of Li-S chemistry?Here,the TiOF/Ti_(3)C_(2)MXene nanoribbons with a tailored F distribution were constructed via an NH4F fluorinated method.Relying on in situ characterizations and electrochemical analysis,the F activates the catalysis function of Ti metal atoms in the consecutive redox reaction.The positive charge of Ti metal sites is increased due to the formation of O-Ti-F bonds based on the Lewis acid-base mechanism,which contributes to the adsorption of polysulfides,provides more nucleation sites and promotes the cleavage of S-S bonds.This facilitates the deposition of Li_(2)S at lower overpotentials.Additionally,fluorine has the capacity to capture electrons originating from Li_(2)S dissolution due to charge compensation mechanisms.The fluorine modulation strategy holds the promise of guiding the construction of fluorine-based catalysts and facilitating the seamless integration of multiple consecutive heterogeneous catalytic processes.

关 键 词：CATALYSIS FLUORINATION MXene Lithium-sulfur battery Shuttle effect 

分 类 号：O643.36[理学—物理化学] TM912[理学—化学]