Towards flexible lithium-sulfur battery from natural cotton textile
Towards flexible lithium-sulfur battery from natural cotton textile
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DOI：
10.1016/j.electacta.2017.06.069
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发表时间：
2017-08-20
影响因子：
6.6
通讯作者：
Li, Xiaodong
中科院分区：
文献类型：
--
作者：
Gao, Zan;Zhang, Yunya;Li, Xiaodong
未来的可穿戴/便携式电子产品需要具有更高存储能力的灵活电源。锂硫电池因其超高的理论容量，在下一代高能电池的发展中具有广阔的应用前景。然而，柔性锂电池的发展一直受到容量衰减快和缺乏合适的柔性衬底的困扰。本文首先从天然棉织物中制备出具有多孔管状结构的导电活性棉织物（ACT）来装载硫，然后用部分还原的氧化石墨烯（ACT/S-rGO）包裹以固定锂多硫化物。同时，部分还原的氧化石墨烯纳米片可以作为导电涂层，进一步缓解了硫的导电性差，并实现了电子沿ACT纤维的快速传输。此外，在阴极和分离器之间插入具有微孔大小分布的koh活化ACT，以减轻多硫化物的“穿梭效应”。最后，具有多孔ACT夹层的组装的ACT/S-rGO阴极表现出优异的倍率能力和持久的循环性能（即使在200次循环后仍保持1016 mAh g（-1）的良好容量）。还组装了以ACT/S-rGO为阴极的柔性Li-S电池，以展示其作为未来可穿戴电子设备柔性电源的优越潜力。Elsevier Ltd.出版。
The future wearable/portable electronics need flexible power sources with higher storage capability. Lithium-sulfur (Li-S) battery is very promising for the development of next-generation high-energy battery due to its ultra-high theoretical capacity. However, the development of flexible Li-S battery has been plagued by its fast capacity decay and lack of suitable flexible substrates. Herein, a conductive activated cotton textile (ACT) with porous tubular structure was first derived from natural cotton textile to load sulfur, which was further wrapped with partially reduced graphene oxide (ACT/S-rGO) to immobilize lithium polysulfides. Meanwhile, the partially reduced graphene oxide nanosheets could be served as a conductive coating, which further mitigated the poor conductivity of sulfur and enabled fast electron transportation along ACT fibers. Furthermore, a KOH-activated ACT with micropore size distribution was inserted between cathode and separator to mitigate the "shuttle effect" of polysulfides. Finally, the assembled ACT/S-rGO cathode with porous ACT interlayer exhibited an exceptional rate capability and durable cyclic performance (with a well-retained capacity of similar to 1016 mAh g(-1) even after 200 cycles). A flexible Li-S cell with ACT/S-rGO as a cathode was also assembled to demonstrate its superior potential as flexible power sources for future wearable electronic devices. Published by Elsevier Ltd.