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A rational design of the coupling mechanism of physical adsorption and chemical charge effect for high-performance lithium–sulfur batteries

机译：高性能锂硫电池物理吸附与化学电荷效应耦合机理的合理设计

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Lithium sulfur batteries are considered as potential energy storage systems for electrical devices owing to their high energy density, low cost, and environmental friendliness. However, the hasty capacity fading originating from the solution and migration of polysulfides is the major obstacle for their industrial application. The polysulfide adsorption and repulsion effect achieved by adding an extra coating layer on the side of the cathode and separator have been separately proved to be effective in mitigating the shuttle effect. Herein, a cooperative coated separator, which employs a hybrid carbon matrix as the coated material, including an appropriate ratio of N-doped activated conductive carbon and commercial acetylene black, and sulfonated polystyrene as the binder, is established to prevent the migration of polysulfides and serves as a secondary current collector to reutilize the active materials for high-performance lithium sulfur batteries. The research results showed that the coated separator with 50 wt% N-doped activated conductive carbon as the coating material and sulfonated polystyrene as the binder showed highlighted cycle performance, and 731 mA h g ~(?1) was maintained after 150 cycles at 800 mA g ~(?1) (the capacity retention was 86.0%). The superior performance may be because the coated separator can efficiently restrain the polysulfides by physical and chemical effects and also reject the polysulfides by the anion electrostatic effect. In summary, this study provides a new cooperative way to address the shuttle effect and promotes the development of lithium sulfur batteries.
机译：锂硫电池由于其高能量密度，低成本和环境友好性而被认为是电气设备的潜在能量存储系统。然而，由于多硫化物的溶解和迁移而导致的仓促容量下降是其工业应用的主要障碍。已经证明，通过在阴极和隔板的侧面上添加额外的涂层而获得的多硫化物吸附和排斥效果可有效地减轻穿梭效应。在此，为了防止多硫化物和多硫化物的迁移，建立了以混合碳基体为被覆材料的协同涂布隔板，该混合碳基质包括适当比例的N掺杂活性导电碳和市售乙炔黑，以及磺化聚苯乙烯作为粘合剂。作为二次集电器，可将活性材料重新用于高性能锂硫电池。研究结果表明，以50％（重量）的N掺杂活性导电碳为涂料，磺化聚苯乙烯为黏合剂的涂层隔膜表现出突出的循环性能，在800 mA循环150次后保持731 mA hg〜（？1）。 g〜（Δ1）（容量维持率为86.0％）。优异的性能可能是因为涂覆的隔膜可以通过物理和化学作用有效地抑制多硫化物，并且还可以通过阴离子静电作用而排斥多硫化物。综上所述，本研究为解决穿梭效应提供了一种新的合作方式，并促进了锂硫电池的发展。

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