二维蒙脱土-碳纳米管交联多孔网络中间层对多硫化物穿梭的抑制作用

A 2D montmorillonite-carbon nanotube interconnected porous network that prevents polysulfide shuttling

    摘要
  • 摘要: 将一维碳纳米管（CNT）和二维蒙脱土（MMT）纳米片复合并用于修饰商用聚丙烯（PP）隔膜。得益于碳纳米管的高电子导电性，以及MMT对多硫化物（LiPS）的强吸附能力和低的锂离子传输势垒，所得的交联多孔CNT-MMT复合阻挡层具有优异的结构稳定性和高的锂离子传输能力，表现出抑制LiPS穿梭的性能，因此实现了高硫利用率。结果表明，该复合阻挡层修饰的PP隔膜有效提升了锂硫电池的锂离子扩散系数、放电比容量和循环稳定性。所组装锂硫电池的0.1 C初始放电比容量为1373 mAh g−1，且具有良好的循环稳定性，在1 C下经500次循环后其每圈容量衰减率仅为0.062%。

     

    Abstract: A commercial polypropylene (PP) separator was modified by a one-dimensional carbon nanotube (CNT) and two-dimensional montmorillonite (MMT) hybrid material (CNT-MMT). Because of the high electron conductivity of the CNTs, and the strong polysulfide (LiPS) adsorption ability and easy lithium ion transport through MMT, the interconnected porous CNT-MMT interlayer with excellent structural integrity strongly suppresses LiPS shuttling while maintaining high lithium-ion transport, producing a high utilization of the active sulfur. Lithium-sulfur batteries assembled with this interlayer have a high lithium-ion diffusion coefficient, a high discharge capacity and stable cycling performance. They had an initial specific capacity of 1373 mAh g−1 at 0.1 C, and a stable cycling performance with a low decay rate of 0.062% per cycle at 1 C after 500 cycles.

     

    • HTML全文
    • 参考文献(35)
    • 相关文章
    • 施引文献
  • 资源附件(0)

/

返回文章
返回