文献类型：期刊文献

英文题名：Ordered Mesoporous Carbon Grafted MXene Catalytic Heterostructure as Li-Ion Kinetic Pump toward High-Efficient Sulfur/Sulfide Conversions for Li-S Battery

作者：Li, Xiang[1];Guan, Qinghua[2,3];Zhuang, Zechao[4];Zhang, Yongzheng[1];Lin, Yuhang[1];Wang, Jian[2,3,5];Shen, Chunyin[1];Lin, Hongzhen[2,3];Wang, Yanli[1];Zhan, Liang[1];Ling, Licheng[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Suzhou Inst Nanotech & Nanob, i Lab, Suzhou 215123, Peoples R China;[3]Chinese Acad Sci, Suzhou Inst Nanotech & Nanob, CAS Key Lab Nanophoton Mat & Devices, Suzhou 215123, Peoples R China;[4]Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China;[5]Helmholtz Inst Ulm HIU, D-89081 Ulm, Germany

年份：2023

卷号：17

期号：2

起止页码：1653

外文期刊名：ACS NANO

收录：;EI(收录号：20230213374455);WOS:【SCI-EXPANDED(收录号:WOS:000911287000001)】；

基金：ACKNOWLEDGMENTS This work was financially supported by the National Key R&D Program of China (2021YFA1201503) , National Natural Science Foundation of China (nos. 22075081, 21972164, 22279161, 22078136, and U1710252) , the Fundamental Research Funds for the Central Universities (JKD01231701) , and the Natural Science Foundation of Jiangsu Province (BK 20210130) . Dr. J. Wang thanks the fellowship awarded by the Alexander von Humboldt Foundation.

语种：英文

外文关键词：MXene; ordered mesoporous carbon; heterostructure; electrocatalyst; Li plus kinetic pump

摘要：Lithium-sulfur (Li-S) batteries exhibit unparalleled theoretical capacity and energy density than conventional lithium ion batteries, but they are hindered by the dissatisfactory "shuttle effect" and the sluggish conversion kinetics owing to the low lithium ion transport kinetics, resulting in rapid capacity fading. Herein, a catalytic two-dimensional heterostructure composite is prepared by evenly grafting mesoporous carbon on the MXene nanosheet (denoted as OMC-g-MXene), serving as interfacial kinetic accelerators in Li-S batteries. In this design, the grafted mesoporous carbon in the heterostructure can not only prevent the stack of MXene nanosheets with the enhanced mechanical property but also offer a facilitated pump for accelerating ion diffusion. Meanwhile, the exposed defect-rich OMC-g-MXene heterostructure inhibits the polysulfide shuttling with chemical interactions between OMC-g-MXene and polysulfides and thus simultaneously enhances the electrochemical conversion kinetics and efficiency, as fully investigated by in situ/ex situ characterizations. Consequently, the cells with OMC-g-MXene ion pumps achieve a high cycling capacity (966 mAh g-1 at 0.2 C after 200 cycles), a superior rate performance (537 mAh g-1 at 5 C), and an ultralow decaying rate of 0.047% per cycle after 800 cycles at 1 C. Even employed with a high sulfur loading of 7.08 mg cm-2 under lean electrolyte, an ultrahigh areal capacity of 4.5 mAh cm-2 is acquired, demonstrating a future practical application.