High-entropy sulfides enhancing adsorption and catalytic conversion of lithium polysulfides for lithium-sulfur batteries  

作　　者：Yating Huang Jiajun Wang Wei Zhao Lujun Huang Jinpeng Song Yajie Song Shaoshuai Liu Bo Lu 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China [2]School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China [3]Stake Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China

出　　处：《Journal of Energy Chemistry》2025年第3期263-270,共8页能源化学(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(U22A20113,52261135543)。

摘　　要：Lithium-sulfur(Li-S)batteries with high energy density suffer from the soluble lithium polysulfide species,Traditional metal sulfides containing a single metal element used as electrocatalysts for Li-S batteries commonly have limited catalytic abilities to improve battery performance.Herein,based on the Hume-Rothery rule and solvothermal method,the high-entropy sulfide NiCoCuTiVS_(x)derived from Co_(9)S_(8)was designed and synthesized,to realize the combination of small local strain and excellent catalytic performance.With all five metal elements(Ni,Co,Cu,Ti,and V)capable of chemical interactions with soluble polysulfides,NiCoCuTiVS_(x)exhibited strong chemical confinement of polysulfides and promoted fast kinetics for polysulfides conversion.Consequently,the S/NiCoCuTiVS_(x)cathode can maintain a high discharge capacity of 968.9 mA h g^(-1)after 200 cycles at 0.5 C and its capacity retention is 1.3 times higher than that of S/Co_(9)S_(8).The improved cycle stability can be attributed to the synergistic effect originating from the multiple metal elements,coupled with the reduced nucleation and activation barriers of Li_(2)S.The present work opens a path to explore novel electrocatalyst materials based on high entropy materials for the achievement of advanced Li-S batteries.

关 键 词：High-entropy sulfides Hume-Rothery rule Polysulfides adsorption Cycle stability Lithium-sulfur batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]