文献类型：期刊文献

英文题名：In Situ Formed Protective Barrier Enabled by Sulfur@Titanium Carbide (MXene) Ink for Achieving High-Capacity, Long Lifetime Li-S Batteries

作者：Tang, Huan[1,2];Li, Wenlong[1,2];Pan, Limei[1,2];Cullen, Conor P.[3,4];Liu, Yu[5];Pakdel, Amir[3,4];Long, Donghui[5];Yang, Jian[1,2];McEvoy, Niall[3,4];Duesberg, Georg S.[3,4,6];Nicolosi, Valeria[3,4];Zhang, Chuanfang (John)[3,4]

机构：[1]Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China;[2]Nanjing Tech Univ, Jiangsu Collaborat Innovat Ctr Adv Inorgan Funct, Nanjing 210009, Jiangsu, Peoples R China;[3]Trinity Coll Dublin, CRANN, Dublin 2, Ireland;[4]Trinity Coll Dublin, Sch Chem, Adv Mat Bioengn Res Ctr AMBER, Dublin 2, Ireland;[5]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[6]Univ Bundeswehr, Fac Elect Engn & Informat Technol, EIT 2, Inst Phys, Werner Heisenberg Weg 39, D-85577 Munich, Neubiberg, Germany

年份：2018

卷号：5

期号：9

外文期刊名：ADVANCED SCIENCE

收录：;EI(收录号：20183105648792);WOS:【SCI-EXPANDED(收录号:WOS:000444940600003)】；

基金：H.T., W.L.L., and L.M.P. contributed equally to this work. This paper was written by C.F.Z. with contributions from all co-authors. The authors especially thank Prof. Qiang Zhang from Tsinghua University for helpful discussions to improve the quality of this manuscript. The authors acknowledge financial support from the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), Qing Lan Project, the Postgraduate Research & Practice Innovation Program of Jiangsu (KYCX18_1087), and the Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT, IRT1146 and IRT15R35), and the European Research Council (ERC) under the project 3D2DPrint (Grant Agreement No. 681544).

语种：英文

外文关键词：Li-S batteries; MXene; polysulfide shuttles; protective barriers; sulfate complexes

摘要：Sulfur (S) is an attractive cathode material with advantages including high theoretical capacity and low cost. However, issues such as the lithium polysulfide shuttle effect and its insulating properties greatly limit the future applications of lithium-sulfur (Li-S) batteries. Here, a viscous aqueous ink with nanoscale S uniformly decorated on the polar, metallically conductive titanium carbide MXene nanosheets (S@Ti3C2Tx) is reported to address these issues. Importantly, it is observed that the conductive Ti3C2Tx mediator efficiently chemisorbs the soluble polysulfides and converts them into thiosulfate/sulfate. The in situ formed sulfate complex layer acts as a thick protective barrier, which significantly retards the shuttling of polysulfides upon cycling and improves the sulfur utilization. Consequently, the binder-free, robust, highly electrically conductive composite film exhibits outstanding electrochemical performance, including high capacities (1244-1350 mAh g(-1)), excellent rate handling, and impressive cycling stability (0.035-0.048% capacity loss per cycle), surpassing the best MXene-S batteries known. The fabrication of a pouch cell based on the freestanding S@Ti3C2Tx film is also reported. The prototype device showcases high capacities and excellent mechanical flexibility. Considering the broad family of MXenes and their unique roles in immobilizing the polysulfides, various S@MXene composites can be similarly fabricated with promising Li+ storage capability and long lifetime performance.