Synergistic adsorption and catalytic effects of Ti_(3)C_(2)T_(x)/CoO/MoO_(3) composite on lithium polysulfides for high-performance lithium–sulfur batteries  

作　　者：Bin Fan Weikun Chen Kaining Li Qingya Wei Qian He Wei Liu Bigui Zhou Jun Yuan Yingping Zou 

机构地区：[1]College of Chemistry and Chemical Engineering,Central South University,Changsha,China [2]College of Resources and Environmental Science,South-Central University for Nationalities,Wuhan,China [3]Institute of Carbon Neutrality and New Energy,School of Electronics and Information,Hangzhou Dianzi University,Hangzhou,China [4]Institute for Advanced Study,Central South University,Changsha,China

出　　处：《Interdisciplinary Materials》2024年第5期726-737,共12页交叉学科材料（英文）

基　　金：Institute of Advanced Study of Central South University;High Performance Computing Center of Central South University。

摘　　要：The shuttle effect of lithium polysulfides(LiPSs)and their sluggish kinetic processes lead to rapid capacity fading and poor cycling stability in lithium-sulfur(Li-S)batteries,limiting their commercial viability.This study proposes a functionalized separator with adsorption and synergistic catalysis ability for Li-S batteries.The modified separator comprises Ti_(3)C_(2)T_(x) sheets,CoO,and MoO_(3).Experimental and theoretical calculations demonstrate that Ti_(3)C_(2)T_(x)/CoO/MoO_(3) composite not only effectively inhibits the shuttle effect of LiPSs,ensuring efficient utilization of active materials,but also enhances reversibility and reaction kinetics among LiPSs.The full exposure of active sites in the Ti_(3)C_(2)T_(x)/CoO/MoO_(3) composite and the synergistic action of different catalysts enable efficient capture and conversion of LiPSs molecules at the material surface.Besides,the lithium-sulfur batteries with Ti_(3)C_(2)T_(x)/CoO/MoO_(3)@PP separator exhibited only a 0.042%capacity decay per cycle at 0.5 C(800 cycles).Moreover,a high areal capacity of 6.85 mAh cm-2 was achieved at high sulfur loading(7.9 mg cm-2)and low electrolyte-to-sulfur ratio(10μL mg-1).

关 键 词：lithium-sulfur batteries POLYSULFIDES reaction kinetics SEPARATOR synergistic catalysis 

分 类 号：TM912[电气工程—电力电子与电力传动]