有双重固硫作用的PEDOT包覆MnO_2纳米管阴极用于高性能的锂硫电池（英文）
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摘要
制备了α-MnO_2纳米管作为硫的宿主材料,将硫填充到α-MnO_2管的中空部分,并通过原位聚合法在α-MnO_2外层包覆一层薄层聚(3,4-乙烯二氧噻吩)(PEDOT)进一步束缚硫。这样一种双重固硫的阴极材料S@α-MnO_2-PEDOT在锂硫电池中体现出了高的性能。在电流密度1 675 mA·g~(-1)(1C)下循环200圈,容量为774.4 mAh·g~(-1),且在电流密度为3 350 mA·g~(-1)(2C)下容量达854.1 mAh·g~(-1),体现出良好的循环稳定性和倍率性能。这些显著的性能得益于阴极材料新颖的结构。在这种结构中,α-MnO_2纳米管不仅能对硫起到物理限制作用,而且增强了硫宿主材料和多硫化物间的化学相互作用。同时,PEDOT的引入增强了含硫纳米复合材料的导电性,并进一步减少了由于体积变化和多硫化锂的过度溶解引起的硫的损失。
MnO_2 nanotubes were developed as host material to fill with sulfur in their tubular hollow space,and then the sulfur were further encapsulated by a thin layer of poly(3,4-ethylenedioxythiophene)(PEDOT)exterior coating via an in situ polymerization process. Such a dual-confined sulfur cathode, denoted as S@α-MnO_2-PEDOT, showed high performance in lithium-sulfur batteries. It could reach a capacity of 774.4 mAh·g~(-1) at a current density of 1 675 mA·g~(-1)(1C) after 200 cycles and 854.1 mAh·g~(-1) at a current density of 3 350 mA·g-1(2C), manifesting excellent cycling stability and rate capability. The outstanding performances are attributed to the new architecture. In the novel architecture, α-MnO_2 nanotubes not only provide the physical confinement for sulfur, but also enhance the chemical interaction between the sulfur host material and polysulfides.Simultaneously, PEDOT was introduced to enhance conductivity of sulfur-containing nanocomposites and further reduce the loss of sulfur due to volumetric change and the excessive dissolution of lithium polysulfides.
MnO_2 nanotubes were developed as host material to fill with sulfur in their tubular hollow space,and then the sulfur were further encapsulated by a thin layer of poly(3,4-ethylenedioxythiophene)(PEDOT)exterior coating via an in situ polymerization process. Such a dual-confined sulfur cathode, denoted as S@α-MnO_2-PEDOT, showed high performance in lithium-sulfur batteries. It could reach a capacity of 774.4 mAh·g~(-1) at a current density of 1 675 mA·g~(-1)(1C) after 200 cycles and 854.1 mAh·g~(-1) at a current density of 3 350 mA·g-1(2C), manifesting excellent cycling stability and rate capability. The outstanding performances are attributed to the new architecture. In the novel architecture, α-MnO_2 nanotubes not only provide the physical confinement for sulfur, but also enhance the chemical interaction between the sulfur host material and polysulfides.Simultaneously, PEDOT was introduced to enhance conductivity of sulfur-containing nanocomposites and further reduce the loss of sulfur due to volumetric change and the excessive dissolution of lithium polysulfides.
引文
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