In this work, we fabricated a sulfur-infiltrated three-dimensional reduced graphene oxide wrapped Na₄Mn₉O₁₈ nanorods microsphere (NMO/RGO/S) as efficient cathode material lithium/sulfur (Li/S) batteries. The NMO/RGO/S microsphere was developed by spray drying the NMO, GO, and S suspension followed by a hydrazine reduction process. The resulting hierarchical microsphere, constructed by cross-linked NMO nanorods and RGO sheet, shortens the electron/ion diffusion pathway. It also provides adequate void space to accommodate S and mitigate the volume variation during cycling. Additionally, the polar NMO nanorods offer strong chemical adsorption to lithium polysulfides, which was confirmed by adsorption experiment. Owing these features, the NMO/RGO/S electrode exhibited a high specific capacity and good cyclability as well. The initial discharge capacity is 952.8 mAh g⁻¹ at 1 C, and after 500 cycles, a discharge capacity of 520 mAh g⁻¹ is maintained, which corresponds to a capacity fading of 0.09% per cycle. The simple preparation method for the construction of NMO/RGO/S microsphere reported in the study advances the development of efficient cathode materials for Li/S battery.

Graphical abstract

在这项工作中，我们制造了包裹了Na ₄ Mn ₉ O ₁₈的硫渗透的三维还原氧化石墨烯包裹物。纳米棒微球（NMO / RGO / S）作为有效的正极材料锂/硫（Li / S）电池。通过将NMO，GO和S悬浮液喷雾干燥，然后进行肼还原工艺，可以开发出NMO / RGO / S微球。由交联的NMO纳米棒和RGO薄片构成的分层微球缩短了电子/离子扩散路径。它还提供了足够的空隙空间来容纳S并减轻循环过程中的体积变化。此外，极性NMO纳米棒对多硫化锂具有很强的化学吸附能力，这已通过吸附实验得到了证实。由于这些特征，NMO / RGO / S电极表现出高的比容量和良好的可循环性。初始放电容量为952.8 mAh g ^-1在1℃下并且在500次循环之后，维持了520mAh g ^-1的放电容量，这对应于每循环0.09％的容量衰减。研究中报道的一种简单的制备NMO / RGO / S微球的制备方法促进了Li / S电池高效阴极材料的开发。

图形概要