One-step growth of ultrathin CoSe_(2)nanobelts on N-doped MXene nanosheets for dendrite-inhibited and kinetic-accelerated lithium-sulfur chemistry  

作　　者：Chuanliang Wei Zhengran Wang Peng Wang Xinlu Zhang Xuguang An Jinkui Feng Baojuan Xi Shenglin Xiong 

机构地区：[1]School of Chemistry and Chemical Engineering,School of Materials Science and Engineering,Shandong University,Jinan 250100,China [2]School of Mechanical Engineering,Chengdu University,Chengdu 610106,China

出　　处：《Science Bulletin》2024年第13期2059-2070,共12页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(U21A2077 and 51972198);the Natural Science Foundation of Shandong Province(ZR2021ZD05,ZR2020JQ19,and ZR2023QB169);Taishan Scholars Program of Shandong Province(ts20190908 and tsqn201812002);the State Key Program of National Natural Science of China(62133007);Shenzhen Fundamental Research Program(JCYJ20190807093405503);China Postdoctoral Science Foundation(2022M721913).

摘　　要：The practical application of lithium–sulfur(Li–S)batteries is inhibited by the shuttle effect of lithium polysulfides(LiPSs)and slow polysulfide redox kinetics on the S cathode as well as the uncontrollable growth of dendrites on the Li metal anode.Therefore,both cathode and anode sides must be considered when modifying LiS batteries.Herein,two-dimensional(2D)ultrathin CoSe_(2)nanobelts are in situ grown on 2D N-doped MXene nanosheets(CoSe_(2)@N-MXene)via one-step solvothermal process for the first time.Owing to its unique 2D/2D structure,CoSe_(2)@N-MXene can be processed to crumpled nanosheets by freeze-drying and flexible and freestanding films by vacuum filtration.These crumpled CoSe_(2)@NMXene nanosheets with abundant active sites and inner spaces can act as S hosts to accelerate polysulfide redox kinetics and suppress the shuttle effect of LiPSs owing to their strong adsorption ability and catalytic conversion effect with LiPSs.Meanwhile,the CoSe_(2)@N-MXene film(CoSe_(2)@NMF)can act as a current collector to promote uniform Li deposition because it contains lithiophilic CoSe_(2)and N sites.Under the systematic effect of CoSe_(2)@N-MXene on S cathode and Li metal anode,the electrochemical and safety performance of Li–S batteries are improved.CoSe_(2)@NMF also shows excellent storage performances in flexible energy storage devices.

关 键 词：Ultrathin CoSe_(2)nanobelts N-doped MXene nanosheets In situ growth Flexible MXene-based films Li-S batteries 

分 类 号：O64[理学—物理化学]