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A dual-faced interlayer prepared by electron beam evaporation for enhanced-performance lithiumsulfur batteries

机译：通过电子束蒸发制备的双面层间用于增强性能锂硫磺电池

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摘要

In this work, a dual-faced carbon paper was prepared by depositing Al2O3 on one side of carbonized filter paper via the technique of electron beam evaporation. Assembled into Li-S batteries, the Al2O3-deposited carbon paper served as a multifunctional interlayer. The cathode of 70% sulfur content with this interlayer presented notable enhancements in electrochemical performance in contrast to that with a single carbon interlayer. At a current rate of 0.5 degrees C, the battery with the Al2O3-deposited carbon interlayer delivered a high initial capacity of 1253 mA h g(-1) and retention of 700 mA h g(-1) over 120 cycles, while the battery with the carbon interlayer delivered an approximate initial capacity of 1117 mA h g(-1) but much poorer retention of 441 mA h g(-1) over 87 cycles. The carbon side of the interlayer was placed toward the cathode as the upper current collector, which ensured the conductivity of the contact interface with the active material and promoted activation of sulfur. At the same, Al2O3 as a polar material facing toward the separator impeded the leakage of soluble polysulfides and mitigated the shuttle effect by chemical adsorption of soluble polysulfides. Combined with the interstitial structure of the interlayer acting as a physical container, Li-S batteries with this novel interlayer demonstrate superiorities in capacity, variable discharge/charge rate, Electrochemical Impedance Spectroscopy (EIS) and Cyclic Voltammetry (CV) characteristics.
机译：在这项工作中，通过电子束蒸发技术将Al2O3沉积在碳化滤纸的一侧上，制备双面碳纸。组装成Li-S电池，Al2O3沉积的碳纸用作多功能中间层。与具有单个碳中间层的电化学性能的显着增强，70％硫含量的阴极呈现出显着的增强。以0.5℃的电流速率，具有Al2O3沉积的碳中间层的电池的高初始容量为1253 mA Hg（-1），并保持700 mA Hg（-1）超过120个循环，而电池碳层间递送近似初始容量1117 mA hg（-1），但在87周期上的441 mA hg（-1）较差的较差较差。将中间层的碳侧朝向阴极作为上集电器置于阴极，这确保了与活性材料的接触界面的导电性并促进了硫的活化。在相同的情况下，Al2O3作为面向分离器的极性材料阻碍了可溶性多硫化物的泄漏，并通过化学吸附的可溶性多硫化物的化学吸附来减轻梭效果。结合其作为物理容器的中间层的间隙结构，具有这种新型中间层的Li-S电池表明了容量，可变放电/充电率，电化学阻抗谱（EIS）和循环伏安法（CV）特性的优势。

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  • 来源
    《RSC Advances》 |2017年第70期|共8页
  • 作者

    Tang Qiong; Li Heqin; Zhang Jing; Lin Zhiwei; Pan Yuanyuan; Hu Qingzhuo; You Yu; Ye Yangwei;

  • 作者单位

    Hefei Univ Technol Sch Mat Sci &

    Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Mat Sci &

    Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Mat Sci &

    Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Mat Sci &

    Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Mat Sci &

    Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Mat Sci &

    Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Elect Sci &

    Appl Phys Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Elect Sci &

    Appl Phys Hefei 230009 Anhui Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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