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 

机构地区：[1]State Key Laboratory of Physical Chemistry of Solid Surfaces,Department of Chemical and Biochemical Engineering,College of Chemistry and Chemical Engineering,Collaborative Innovation Centre of Chemistry for Energy Materials(iChEM),Xiamen University,Xiamen 361005,Fujian,China

出　　处：《Journal of Energy Chemistry》2023年第6期492-501,I0011,共11页能源化学（英文版）

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。

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.

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

分 类 号：TM912[电气工程—电力电子与电力传动] TQ426[化学工程]