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首页> 外文期刊>Advanced energy materials >Capture and Catalytic Conversion of Polysulfides by In Situ Built TiO_2-MXene Heterostructures for Lithium–Sulfur Batteries
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Capture and Catalytic Conversion of Polysulfides by In Situ Built TiO_2-MXene Heterostructures for Lithium–Sulfur Batteries

机译：用原位捕获和催化转化多硫化物的锂 - 硫含量的TiO_2- M烷异质结构

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摘要

The detrimental shuttle effect in lithium-sulfur batteries mainly results from the mobility of soluble polysulfide intermediates and their sluggish conversion kinetics. Herein, presented is a multifunctional catalyst with the merits of strong polysulfides adsorption ability, superior polysulfides conversion activity, high specific surface area, and electron conductivity by in situ crafting of the TiO2-MXene (Ti3C2Tx) heterostructures. The uniformly distributed TiO2 on MXene sheets act as capturing centers to immobilize polysulfides, the hetero-interface ensures rapid diffusion of anchored polysulfides from TiO2 to MXene, and the oxygen-terminated MXene surface is endowed with high catalytic activity toward polysulfide conversion. The improved lithium-sulfur batteries deliver 800 mAh g(-1) at 2 C and an ultralow capacity decay of 0.028% per cycle over 1000 cycles at 2 C. Even with a high sulfur loading of 5.1 mg cm(-2), the capacity retention of 93% after 200 cycles is still maintained. This work sheds new insights into the design of high-performance catalysts with manipulated chemical components and tailored surface chemistry to regulate polysulfides in Li-S batteries.
机译：锂硫电池中的有害穿梭效果主要是由可溶性多硫化物中间体的流动性及其缓慢转化动力学产生的。本文呈现是多官能催化剂，其具有强多硫化物吸附能力的优点，优异的多硫化物转化活性，高比表面积和电子传导性通过原位制备TiO 2 -M×（Ti3C2Tx）异质结构。均匀分布的蒙脱薄片上的TiO 2充当固定聚硫化物的捕获中心，确保锚固多硫化物从TiO 2到Mxene的快速扩散，并且氧封端的偏烯表面具有高催化活性朝多硫化物转化率赋予高催化活性。改进的锂 - 硫电池在2℃下递送800mAhg（-1），在2℃下以每循环超过1000次循环的超低电容衰减。即使高硫载荷为5.1mg cm（-2），仍然保持200个循环后的93％能力保留。这项工作揭示了具有操纵化学成分的高性能催化剂的设计和量身定制的表面化学来调节LI-S电池的多硫化物。

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  • 来源
    《Advanced energy materials》 |2019年第19期|1900219.1-1900219.9|共9页
  • 作者

    Jiao Long; Zhang Chen; Geng Chuannan; Wu Shichao; Li Huan; Lv Wei; Tao Ying; Chen Zijin; Zhou Guangmin; Li Jia; Ling Guowei; Wan Ying; Yang Quan-Hong;

  • 作者单位

    Tianjin Univ Sch Chem Engn & Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Marine Sci & Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn & Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn & Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn & Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin Tianjin 300072 Peoples R China;

    Tsinghua Univ Grad Sch Shenzhen Shenzhen Key Lab Graphene Based Mat Shenzhen 518055 Peoples R China;

    Tianjin Univ Sch Chem Engn & Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin Tianjin 300072 Peoples R China;

    Tsinghua Univ Grad Sch Shenzhen Shenzhen Key Lab Graphene Based Mat Shenzhen 518055 Peoples R China;

    Stanford Univ Dept Mat Sci & Engn Stanford CA 94305 USA;

    Tsinghua Univ Grad Sch Shenzhen Shenzhen Key Lab Graphene Based Mat Shenzhen 518055 Peoples R China;

    Tianjin Univ Sch Marine Sci & Technol Tianjin 300072 Peoples R China;

    Shanghai Normal Univ Key Lab Resource Chem Minist Educ Shanghai Key Lab Rare Earth Funct Mat Minist Educ Shanghai 200234 Peoples R China|Shanghai Normal Univ Dept Chem Shanghai 200234 Peoples R China;

    Tianjin Univ Sch Chem Engn & Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin Tianjin 300072 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    catalytic conversion; lithium-sulfur batteries; polysulfides shuttling; TiO2-MXene heterostructures;

    机译：催化转化;锂 - 硫磺电池;多硫化物梭;TiO2-茂物异质结构;

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