Functional Mesoporous Carbon-Coated Separator for Long-Life, High-Energy Lithium-Sulfur Batteries
Functional Mesoporous Carbon-Coated Separator for Long-Life, High-Energy Lithium-Sulfur Batteries
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DOI：
10.1002/adfm.201502251
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发表时间：
2015-09-02
影响因子：
19
通讯作者：
Giebeler, Lars
中科院分区：
文献类型：
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作者：
Balach, Juan;Jaumann, Tony;Giebeler, Lars
锂硫（Li-S）电池被认为是最有前途的可充电能量存储技术，用于清洁能源运输系统的日益增加的应用，这是由于其显著的高理论能量密度（2.6kWh kg（-1）），大大优于当今的锂离子电池。此外，使用硫作为活性阴极材料具有廉价、环境友好和天然丰富的优点。然而，硫的绝缘性质、快速容量衰减和Li-S电池的短寿命阻碍了它们的商业化。为了提高锂硫电池的整体性能，提出了一种功能性介孔碳包覆隔膜。商业聚丙烯隔板的直接涂层改性允许整合导电中孔碳层，其提供物理位置以定位溶解的多硫化物中间体并将其作为活性材料保留在阴极侧内。尽管使用简单的硫-炭黑混合物作为阴极，但具有介孔碳涂覆的隔膜的Li-S电池提供了优异的性能，在0.2 C下的初始容量为1378 mAh g（-1），在0.5 C下500次循环后，可逆容量为723 mAh g（-1），并且每次循环的降解率仅为0.081%。
The lithium-sulfur (Li-S) battery is regarded as the most promising rechargeable energy storage technology for the increasing applications of clean energy transportation systems due to its remarkable high theoretical energy density of 2.6 kWh kg(-1), considerably outperforming today's lithium-ion batteries. Additionally, the use of sulfur as active cathode material has the advantages of being inexpensive, environmentally benign, and naturally abundant. However, the insulating nature of sulfur, the fast capacity fading, and the short lifespan of Li-S batteries have been hampered their commercialization. In this paper, a functional mesoporous carbon-coated separator is presented for improving the overall performance of Li-S batteries. A straightforward coating modification of the commercial polypropylene separator allows the integration of a conductive mesoporous carbon layer which offers a physical place to localize dissolved polysulfide intermediates and retain them as active material within the cathode side. Despite the use of a simple sulfur-carbon black mixture as cathode, the Li-S cell with a mesoporous carbon-coated separator offers outstanding performance with an initial capacity of 1378 mAh g(-1) at 0.2 C, and high reversible capacity of 723 mAh g(-1), and degradation rate of only 0.081% per cycle, after 500 cycles at 0.5 C.