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首页> 外文期刊>Advanced energy materials >High-Performance and Low-Temperature Lithium–Sulfur Batteries: Synergism of Thermodynamic and Kinetic Regulation
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High-Performance and Low-Temperature Lithium–Sulfur Batteries: Synergism of Thermodynamic and Kinetic Regulation

机译：高性能和低温锂硫电池：热力学和动力学调节的协同作用

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摘要

The intrinsic polysulfides shuttle, resulting from not only concentration-gradient diffusion but also slow conversion kinetics of polysulfides, bears the primary responsibility for the poor capacity and cycle stability of lithium-sulfur batteries (LSBs). Here, it is first presented that enriched edge sites derived from vertical standing and ultrathin 2D layered metal selenides (2DLMS) can simultaneously achieve the thermodynamic and kinetic regulation for polysulfides diffusion, which is systematically elucidated through theoretical calculation, electrochemical characterization, and spectroscopic/microscopic analysis. When employed to fabricate compact coating layer of separator, an ultrahigh capacity of 1338.7 mA h g(-1) is delivered after 100 cycles at 0.2 C, which is the best among the reports. Over 1000 cycles, the cell still maintains the capacity of 546.8 mA h g(-1) at 0.5 C. Moreover, the cell exhibits outstanding capacities of 1106.2 and 865.7 mA h g(-1) after 100 cycles at stern temperature of 0 and -25 degrees C. The superior low-temperature performance is appealing for extended practical application of LSBs. Especially, in view of the economy, the 2DLMS is recycled as an anode of lithium-ion and sodium-ion batteries after finishing the test of LSBs. The low-cost and scalable 2DLMS with enriched egde sites open a new avenue for the perfect regulation of the sulfur electrode.
机译：固有的多硫化物往复运动不仅是由浓度梯度扩散引起的，而且还由于多硫化物的缓慢转化动力学所致，主要归因于锂硫电池（LSB）的容量和循环稳定性差。在这里，首先提出了来自垂直站立和超薄2D层金属硒化物（2DLMS）的富集边缘位点可以同时实现多硫化物扩散的热力学和动力学调节，这通过理论计算，电化学表征和光谱/显微系统地得以阐明。分析。当用于制造隔膜的致密涂层时，在0.2 C下循环100次后，可提供1338.7 mA h g（-1）的超高容量，这是报道中最好的。在1000次循环中，该电池在0.5 C时仍保持546.8 mA hg（-1）的容量。此外，在0和-25的严苛温度下进行100次循环后，该电池仍具有1106.2和865.7 mA hg（-1）的出色容量。优异的低温性能吸引了LSB的广泛实际应用。特别是，考虑到经济性，在完成LSB的测试后，将2DLMS用作锂离子和钠离子电池的阳极。低成本且可扩展的2DLMS，具有丰富的甘氨酸位点，为硫电极的完美调节开辟了一条新途径。

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  • 来源
    《Advanced energy materials》 |2018年第18期|1703638.1-1703638.11|共11页
  • 作者

    Fan Chao-Ying; Zheng Yan-Ping; Zhang Xiao-Hua; Shi Yan-Hong; Liu Si-Yu; Wang Han-Chi; Wu Xing-Long; Sun Hai-Zhu; Zhang Jing-Ping;

  • 作者单位

    Northeast Normal Univ, Fac Chem, Natl & Local United Engn Lab Power Batteries, Changchun 130024, Jilin, Peoples R China;

    Northeast Normal Univ, Fac Chem, Natl & Local United Engn Lab Power Batteries, Changchun 130024, Jilin, Peoples R China;

    Northeast Normal Univ, Fac Chem, Natl & Local United Engn Lab Power Batteries, Changchun 130024, Jilin, Peoples R China;

    Northeast Normal Univ, Fac Chem, Natl & Local United Engn Lab Power Batteries, Changchun 130024, Jilin, Peoples R China;

    Northeast Normal Univ, Fac Chem, Natl & Local United Engn Lab Power Batteries, Changchun 130024, Jilin, Peoples R China;

    Northeast Normal Univ, Fac Chem, Natl & Local United Engn Lab Power Batteries, Changchun 130024, Jilin, Peoples R China;

    Northeast Normal Univ, Fac Chem, Natl & Local United Engn Lab Power Batteries, Changchun 130024, Jilin, Peoples R China;

    Northeast Normal Univ, Fac Chem, Natl & Local United Engn Lab Power Batteries, Changchun 130024, Jilin, Peoples R China;

    Northeast Normal Univ, Fac Chem, Natl & Local United Engn Lab Power Batteries, Changchun 130024, Jilin, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    2D layered metal selenides; enriched edge sites; high electrochemical performance; lithium-sulfur batteries; low-temperature performance;

    机译：二维层状金属硒化物;边缘部位富集;高电化学性能;锂硫电池;低温性能;耐高温;

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