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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Enhancing performance of Li-S batteries by coating separator with MnO @ yeast-derived carbon spheres
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Enhancing performance of Li-S batteries by coating separator with MnO @ yeast-derived carbon spheres

机译：用MNO @酵母衍生的碳球涂覆分离器提高LI-S电池的性能

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Lithium-sulfur battery is a potential next generation energy storage technology due to its relatively low price, environmental benign and high theoretical energy density. However, the shuttling of soluble polysulfides between cathode and anode as the major technical problem causes rapid capacity fading of lithium-sulfur battery. Here, a multifunctional interlayer between cathode and separator was designed by introducing MnO particles in yeast-derived carbon spheres to effectively mitigate the shuttling problem and improve the utilization of sulfur. In the coated layer, the high level of graphitization of carbon spheres could be beneficial for facilitating ion transfer and expanding the contact area of polysulfide species. In the meantime, the polar MnO material was adopted to block polysulfides via strong chemical adsorption. The resultant lithium-sulfur batteries exhibit a high initial capacity of 800.2 mA h g(-1) at the current density of 1600 mA g(-1). And after 100 cycles the capacity is 642.7 mA h g(-1) with the fading rate of only 0.2% per cycle. Additionally, polysulfide species blocked by physical and chemical effect could be reutilized in the coated layer, which improves the utilization of sulfur active materials. In summary, the combination of metal oxides and biomass-derived carbon in designing the novel coated separator would provide new avenue for preparing carbon-coated material and facilitate the further development of lithium-sulfur batteries. (C) 2019 Elsevier B.V. All rights reserved.
机译：由于其相对低的价格，环境良性和高理论能量密度，锂 - 硫电池是一个潜在的下一代储能技术。然而，由于主要技术问题的阴极和阳极之间的可溶性多硫化物的穿梭导致锂 - 硫电池的快速容量衰落。这里，通过在酵母衍生的碳球中引入MnO颗粒来设计阴极和隔膜之间的多功能中间层，以有效地减轻穿梭问题并改善硫的利用。在涂层层中，碳球的高水平石墨化可以有利于促进离子转移并膨胀多硫化物物种的接触面积。同时，采用极性MNO材料通过强化学吸附阻断多硫化物。所得锂 - 硫磺电池的高初始容量为800.2mA H（-1），电流密度为1600mA g（-1）。在100次循环之后，容量为642.7 mA H g（-1），衰落率仅为每循环0.2％。另外，通过物理和化学效果阻断的多硫化物物质可以在涂层层中重叠，这改善了硫活性材料的利用。总之，金属氧化物和生物质衍生的碳在设计新型涂覆的隔膜中的组合将为制备碳涂层材料提供新的途径，并促进锂 - 硫电池的进一步发展。 （c）2019 Elsevier B.v.保留所有权利。

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