一步法在氮掺杂MXene纳米片上生长超薄CoSe2纳米带用于枝晶抑制和动力学加速的锂硫电池（英文）

作     者：魏传亮 王正冉 王鹏 张新鲁 安旭光 冯金奎 奚宝娟 熊胜林 

作者机构：School of Chemistry and Chemical Engineering School of Materials Science and Engineering Shandong University School of Mechanical Engineering Chengdu University 

出 版 物：《Science Bulletin》 (科学通报(英文版))

年 卷 期：2024年第13期

页      面：2059-2070页

核心收录：

学科分类：0808[工学-电气工程] 07[理学] 08[工学] 070205[理学-凝聚态物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (U21A2077 and 51972198) the Natural Science Foundation of Shandong Province (ZR2021ZD05, ZR2020JQ19 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 Li-S batteries. Herein, two-dimensional（2D） ultrathin CoSe2nanobelts are in situ grown on 2D N-doped MXene nanosheets（CoSe2@N-MXene） via one-step solvothermal process for the first time. Owing to its unique 2D/2D structure, CoSe2@N-MXene can be processed to crumpled nanosheets by freeze-drying and flexible and freestanding films by vacuum filtration. These crumpled CoSe2@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 CoSe2@N-MXene film（CoSe2@NMF） can act as a current collector to promote uniform Li deposition because it contains lithiophilic CoSe2and N sites. Under the systematic effect of CoSe2@N-MXene on S cathode and Li metal anode, the electrochemical and safety performance of Li–S batteries are improved. CoSe2@NMF also shows excellent storage performances in flexible energy storage devices.