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Improving the cycling stability of lithium-sulfur batteries by hollow dual-shell coating

机译：通过中空双壳涂层改善锂 - 硫电池的循环稳定性

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摘要

Herein, a novel hybrid S@MnO2@C nanosphere, comprising sulfur nanoparticles encapsulated by a MnO2@C hollow dual-shell, is reported. Benefiting from a conductive C outer Layer, the S@MnO2@C hybrid nanosphere provided highly efficient pathways for fast electron/ion transfer and sufficient free space for the expansion of the encapsulated sulfur nanoparticles. Moreover, the dual-shell composed of a MnO2 inner Layer and a C outer Layer coating on S not only improved the efficacious encapsulation of sulfur, but also significantly suppressed the dissolution of polysulfides during cycling. As a result, the S@MnO2@C electrode shows high capacity, high coulombic efficiency and excellent cycling stability. The S@MnO2@C cathode delivered a discharge capacity of 593 mA h g(-1) in the fourth cycle and was able to maintain 573 mA h g(-1) after 100 charge-discharge cycles at 1.0C, corresponding to a capacity retention of 96.6%.
机译：这里，报道了一种新型杂种S @ MNO2 @ C纳米球，其包含由MnO 2 -C中空双壳包封的硫纳米颗粒。 从导电C外层受益，S @ MNO2锰杂交纳米为快速电子/离子转移和足够的自由空间提供了高效的途径，用于膨胀包封的硫纳米颗粒。 此外，由MnO2内层和C外层涂层组成的双壳不仅改善了硫的有效封装，而且在循环期间也显着抑制多硫化物的溶解。 结果，S @ MNO2 @ C电极显示出高容量，高库仑效率和优异的循环稳定性。 S @ MnO2 @ C阴极在第四个循环中输出593 mA Hg（-1）的放电容量，并且在1.0℃下100℃的充电放电循环后能够保持573 mA Hg（-1），对应于容量保持 96.6％。

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  • 来源
    《RSC Advances》 |2018年第17期|共7页
  • 作者

    Zhang Jianhua; Zou Rujia; Liu Qian; He Shu-ang; Xu Kaibing; Hu Junqing;

  • 作者单位

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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