Reasonable suppression of polysulfides/polyselenides shuttle based on MXene in Na-SeS_(2)batteries  

作　　者：Qiu-Ju Yang Jing Zhao Wei Gao Wei Zhong Yu-Ruo Qi Jin Han Shu-Juan Bao Mao-Wen Xu 

机构地区：[1]School of Materials and Energy,Southwest University,Chongqing,400715,China [2]Helmholtz Institute Ulm,Ulm,89081,Germany [3]Karlsruhe Institute of Technology,Karlsruhe,76021,Germany

出　　处：《Rare Metals》2023年第5期1594-1602,共9页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22179109,22005251);Chongqing Natural Science Foundation(No.cstc2020jcyj-zdxmX0010);Central University Fundamental Research Funds(No.SWU-KR22002)。

摘　　要：Metal-sulfur/selenium batteries have become the focus of new-generation energy storage systems due to the advantages of low-cost and high energy density.However,it still suffers from the notorious shuttle of polysulfides/polyselenides,poor electronic conductivity and tremendous volume expansion.Herein,a dual defense system for polysulfides/polyselenides was proposed and constructed based on MXene.The nitrogen-doped porous carbon(NPC)decorated by Ti_(3)C_(2)T_(x)MXene(M@NPC)was employed as the SeS_(2)host(SeS_(2)@M@NPC).Particularly,Ti_(3)C_(2)T_(x)sheets wrapped on NPC guarantee the rapid ion diffusion and serve as the first barrier for SeS_(2)and dissolved sodium polysulfides/polyselenides.Meanwhile,the few-layered Ti_(3)C_(2)T_(x)sheets coated on glass fiber separators act as the second barrier for alleviating the shuttle of polysulfides/polyselenides through physical interception and chemical adsorption.With this elaborate design,the integrated Na-SeS_(2)battery achieves a high specific capacity of 1243 mAh·g^(-1)at 1.0C,revealing a distinct superiority over its counterparts(SeS_(2)@M@NPC,1083mAh·g^(-1)at 0.5C;and SeS_(2)@NPC,823 mAh·g^(-1)at 0.5C).The findings gained in this work provide a creative idea for the construction of durable room-temperature Na-SeS_(2)batteries based on MXenes and their derivative materials.

关 键 词：MXene Integrated strategy Shuttle effect Room temperature(RT)Na-SeS_(2)batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]