碳纳米管承载MoSe2纳米片作为锂硫电池的夹层材料

Carbon nanotube-supported MoSe2 nanoflakes as an interlayer for lithium-sulfur batteries

    摘要
  • 摘要: 多硫化物的穿梭效应是锂硫（Li-S）电池最致命的固有问题。本文通过在商业聚丙烯隔膜上涂覆碳纳米管支撑的MoSe2纳米片，成功构建了对多硫化物具有强吸附作用的功能化夹层，有效抑制了多硫化物穿梭效应的发生。将该功能化隔膜用于锂硫电池，可获得良好的储能性质。在电流密度为0.1 C时，电池的初始比容量高达1485 mAh g−1。在高电流密度（2 C）下，电池的比容量仍能达到880 mAh g−1，说明电池的倍率性能较好。此外，电池在电流密度为0.5 C时表现出优异的长期循环稳定性。在循环300次的过程中，电池每圈容量的衰减率仅为0.093%。这些优异的储能特性得益于MoSe2对多硫化物的强吸附作用以及CNTs良好的导电性。

     

    Abstract: Intrinsic polysulfide shuttling is the most fatal problem with Li-S batteries but it can be suppressed by functionalizing the separators with strong lithium polysulfide absorbents. Carbon nanotube (CNT)-supported MoSe2 nanoflakes with a large interlayer spacing were coated on a commercial polypropylene separator to build an efficient barrier (M/C-PP) to polysulfide shuttling for Li-S batteries. The battery with the separator had initial specific capacities of 1 485 and 880 mAh g−1 at 0.1 and 2 C, respectively, and an excellent long-term cycling stability with a low decay rate of 0.093% per cycle at 0.5 C after 300 cycles. This excellent performance was attributed to the strong adsorption of polysulfides by MoSe2 and the fast charge transport channels provided by the CNTs.

     

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