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

机译:空心双壳涂层提高锂硫电池的循环稳定性

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Herein, a novel hybrid S@MnO _(2) @C nanosphere, comprising sulfur nanoparticles encapsulated by a MnO _(2) @C hollow dual-shell, is reported. Benefiting from a conductive C outer layer, the S@MnO _(2) @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 MnO _(2) 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@MnO _(2) @C electrode shows high capacity, high coulombic efficiency and excellent cycling stability. The S@MnO _(2) @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:在此,报道了一种新颖的杂化S @ MnO_(2)@C纳米球,其包含被MnO_(2)@C空心双壳包封的硫纳米颗粒。得益于导电的C外层,S @ MnO_(2)@C杂化纳米球为快速的电子/离子转移提供了高效的途径,并为包封的硫纳米颗粒的膨胀提供了足够的自由空间。此外,由MnO_(2)内层和C覆盖在S上的C外层组成的双壳不仅改善了硫的有效包封,而且还显着抑制了循环过程中多硫化物的溶解。结果,S @ MnO _(2)@C电极显示出高容量,高库仑效率和优异的循环稳定性。 S @ MnO _(2)@C阴极在第四个循环中的放电容量为593 mA hg〜(?1),在1.0C的100个充放电循环后能够保持573 mA hg〜(?1)。 ,对应的容量保留率为96.6%。

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