Construction of strong built-in electric field in binary metal sulfide heterojunction to propel high-loading lithium-sulfur batteries

作     者：Weiming Xiong Jiande Lin Huiqun Wang Sha Li Junhao Wang Yuxiang Mao Xiao Zhan De-Yin Wu Li Zhang Weiming Xiong;Jiande Lin;Huiqun Wang;Sha Li;Junhao Wang;Yuxiang Mao;Xiao Zhan;De-Yin Wu;Li Zhang

作者机构：State Key Laboratory of Physical Chemistry of Solid SurfacesDepartment of Chemical and Biochemical EngineeringCollege of Chemistry and Chemical EngineeringCollaborative Innovation Centre of Chemistry for Energy Materials(iChEM)Xiamen UniversityXiamen 361005FujianChina 

出 版 物：《能源化学:英文版》 (Journal of Energy Chemistry)

年 卷 期：2023年第81卷第6期

页      面：492-501,I0011页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financial support from the National Natural Science Foundation of China (NSFC,21875155,22032004) the support of the National Key Research and Development Program of China (2021YFA1201502) the support of the Nanqiang Young Top-notch Talent Fellowship in Xiamen University。 

主　　题：Lithium-sulfur battery MnS-MoS_(2)heterojunction Built-in electric field Sulfur reaction kinetics High sulfur loading 

摘      要：The practical application of lithium-sulfur(Li-S)batteries is greatly hindered by soluble polysulfides shuttling and sluggish sulfur redox kinetics.Rational design of multifunctional hybrid materials with superior electronic conductivity and high electrocatalytic activity,e.g.,heterostructures,is a promising strategy to solve the above obstacles.Herein,a binary metal sulfide MnS-MoS_(2) heterojunction electrocatalyst is first designed for the construction of high-sulfur-loaded and durable Li-S batteries.The MnS-MoS_(2) p-n heterojunction shows a unique structure of MoS_(2) nanosheets decorated with ample MnS nanodots,which contributes to the formation of a strong built-in electric field at the two-phase interface.The MnS-MoS_(2) hybrid host shows strong soluble polysulfide affinity,enhanced electronic conductivity,and exceptional catalytic effect on sulfur reduction.Benefiting from the synergistic effect,the as-derived S/MnS-MoS_(2) cathode delivers a superb rate capability(643 m A h g^(-1)at 6 C)and a durable cyclability(0.048%decay per cycle over 1000 cycles).More impressively,an areal capacity of 9.9 m A h cm^(-2)can be achieved even under an extremely high sulfur loading of 14.7 mg cm^(-2)and a low electrolyte to sulfur ratio of 2.9μL mg^(-1).This work provides an in-depth understanding of the interfacial catalytic effect of binary metal compound heterojunctions on sulfur reaction kinetics.