Self-assemble construction of hetero-structured Co(OH)_(2)/MXene aerogel toward Li-S batteries as a self-supported host and bifunctional catalyst  

作　　者：Yang Liu Ke Tan Sen Liu Xu Zhang Mao-Qiang Shen Xue-Sen Liu Xin-Yue Gao Lin-Rui Hou Chang-Zhou Yuan 

机构地区：[1]School of Materials Science&Engineering,University of Jinan,Jinan 250022,China

出　　处：《Rare Metals》2024年第11期5652-5663,共12页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52072151,52171211,52102253,52271218 and U22A20145);Jinan Independent Innovative Team(No.2020GXRC015);the Major Program of Shandong Province Natural Science Foundation(No.ZR2021ZD05);the Science and Technology Program of University of Jinan(Nos.XKY2119 and XKY2304)。

摘　　要：The shuttling diffusion of polysulfides is a bottleneck that seriously limits the performance of Li-S batteries.Purposeful construction of sulfur cathodes with reliable trapping ability of polysulfides is the key to overcome such limitation.Herein,a hierarchical porous architecture,i.e.,Co(OH)_(2)sheets bonded Ti_3C_(2)T_x MXene aerogel(Co(OH)_(2)/MXA),is constructed via a facile selfassembled approach and used as an efficient free-standing polysulfides reservoir.The interconnected three-dimensional(3D)porous network with void space and strong interfacial interaction not only enables high sulfur loading but facilitates fast ion and electron transport.Experimental and theoretical results confirm the hetero-framework exhibits outstanding immobilization and conversion ability for polysulfides due to its polar surface and bifunctional catalytic activities toward both formation and decomposition of Li2S.The optimized Co(OH)_(2)/MXA cathode delivers excellent rate capability(407 mAh·g^(-1)at 5C)with a sulfur loading of 2.7 mg·cm^(-2),and ultra-stable cycling performance as an extremely small capacity decay of~0.005%per cycle within 1700 cycles at 1C is achieved with a high sulfur loading of 6.7 mg·cm^(-2).More significantly,our design structural/componential methodology here promises the MXene-based aerogel electrodes for LiS batteries and beyond.

关 键 词：MXene aerogel Co(OH)_(2)sheets Hetero-architecture Self-standing hosts Li-S batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ427.26[化学工程]