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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Sulfur nanoparticles/Ti3C2Tx MXene with an optimum sulfur content as a cathode for highly stable lithium-sulfur batteries
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Sulfur nanoparticles/Ti3C2Tx MXene with an optimum sulfur content as a cathode for highly stable lithium-sulfur batteries

机译：硫纳米颗粒/ Ti3C2TX MXINE具有最佳硫含量作为高度稳定的锂 - 硫电池的阴极

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摘要

Lithium-sulfur batteries have a high theoretical energy density but they need better sulfur host materials to retain the lithium polysulfide shuttle effect, which results in the batteries' capacity fading. Titanium carbide MXene (Ti3C2Tx MXene) is an excellent host for the sulfur cathode because of its layered-stacked structure and many surface termination groups. The sulfur content in S/Ti3C2Tx MXene composites is an important factor affecting the cathodes' electrochemical performance. In this work, S/Ti3C2Tx MXene composites with different sulfur contents are prepared by a one-step hydrothermal process, and the influence of the sulfur content in the S/Ti3C2Tx MXene composite on the S/Ti3C2Tx MXene cathode's electrochemical performance is studied. When the mass ratio of sulfur to MXene in the reactant is 4 : 1, the sulfur nanoparticles are uniformly filled in the layered-stacked structure. The layered-stacked structure can buffer the volume expansion of sulfur during cycling and the surface termination groups exhibit strong adsorption of LiPSn. Thus, the S/MXene composite with an optimum sulfur content (67.0 wt%) demonstrates an excellent electrochemical performance, including a high initial reversible capacity (1277 mA h g(-1) at 0.5 C) and the best cycling performance (1059 mA h g(-1) at 0.5 C after 100 cycles). This work offers a guide to developing advanced S-based cathode materials with an appropriate S content for lithium sulfur batteries.
机译：锂硫电池具有很高的理论能量密度，但它们需要更好的硫基质材料来保持锂多硫化物穿梭效应，这会导致电池的容量衰减。碳化钛MXene（Ti3C2Tx-MXene）由于其层状堆积结构和许多表面端基，是一种很好的硫阴极主体。S/Ti3C2Tx-MXene复合材料中的硫含量是影响阴极电化学性能的重要因素。本文采用一步水热法制备了不同硫含量的S/Ti3C2Tx-MXene复合材料，研究了S/Ti3C2Tx-MXene复合材料中硫含量对S/Ti3C2Tx-MXene阴极电化学性能的影响。当反应物中硫与MXene的质量比为4:1时，硫纳米颗粒均匀地填充在层状堆积结构中。层状堆积结构可以缓冲硫在循环过程中的体积膨胀，表面端基表现出对LiPSn的强吸附。因此，具有最佳硫含量（67.0 wt%）的S/MXene复合材料表现出优异的电化学性能，包括高初始可逆容量（0.5 C时为1277 mA h g（-1））和最佳循环性能（100次循环后0.5 C时为1059 mA h g（-1））。这项工作为开发具有合适硫含量的先进硫基锂硫电池正极材料提供了指导。

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    Wang Aoning; Chen Yixuan; Liu Li; Liu Xiang; Wang Zhoulu; Zhang Yi;

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    Nanjing Tech Univ Inst Adv Mat IAM Key Lab Flexible Elect KLOFE Nanjing 211816 Jiangsu Peoples R China;

    Nanjing Tech Univ Inst Adv Mat IAM Key Lab Flexible Elect KLOFE Nanjing 211816 Jiangsu Peoples R China;

    Nanjing Tech Univ Inst Adv Mat IAM Key Lab Flexible Elect KLOFE Nanjing 211816 Jiangsu Peoples R China;

    Nanjing Tech Univ Inst Adv Mat IAM Key Lab Flexible Elect KLOFE Nanjing 211816 Jiangsu Peoples R China;

    Nanjing Tech Univ Inst Adv Mat IAM Key Lab Flexible Elect KLOFE Nanjing 211816 Jiangsu Peoples R China;

    Nanjing Tech Univ Inst Adv Mat IAM Key Lab Flexible Elect KLOFE Nanjing 211816 Jiangsu Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;无机化学;
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