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首页> 外文期刊>Advanced Functional Materials >Ferromagnetic Nanoparticle-Assisted Polysulfide Trapping for Enhanced Lithium-Sulfur Batteries
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Ferromagnetic Nanoparticle-Assisted Polysulfide Trapping for Enhanced Lithium-Sulfur Batteries

机译：铁磁纳米粒子辅助的多硫化物捕集技术，用于增强锂硫电池

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摘要

The lithium-sulfur (Li-S) battery is a promising candidate for next-generation high-density energy storage devices because of its ultrahigh theoretical energy density and the natural abundance of sulfur. However, the practical performance of the sulfur cathode is plagued by fast capacity decay and poor cycle life, both of which can be attributed to the intrinsic dissolution/shuttling of lithium polysulfides. Here, a new built-in magnetic field-enhanced polysulfide trapping mechanism is discovered by introducing ferromagnetic iron/iron carbide (Fe/Fe3C) nanoparticles with a graphene shell (Fe/Fe3C/graphene) onto a flexible activated cotton textile (ACT) fiber to prepare the ACT@Fe/Fe3C/graphene sulfur host. The novel trapping mechanism is demonstrated by significant differences in the diffusion behavior of polysulfides in a custom-designed liquid cell compared to a pure ACT/S cathode. Furthermore, a cell assembled using the ACT@Fe/Fe3C/S cathode exhibits a high initial discharge capacity of approximate to 764 mAh g(-1), excellent rate performance, and a remarkably long lifespan of 600 cycles using ACT@Fe/Fe3C/S (whereas only 100 cycles can be achieved using pure ACT/S). The new magnetic field-enhanced trapping mechanism provides not only novel insight but unveils new possibilities for mitigating the "shuttle effect" of polysulfides thereby promoting the practical applications of Li-S batteries.
机译：锂硫（Li-S）电池具有超高的理论能量密度和自然的硫含量，是下一代高密度储能设备的有希望的候选者。然而，硫阴极的实际性能受到容量衰减快和循环寿命差的困扰，这两者都可以归因于多硫化锂的固有溶解/穿梭。在这里，通过将具有石墨烯壳层的铁磁性铁/碳化铁（Fe / Fe3C）纳米颗粒（Fe / Fe3C /石墨烯）引入到柔性活性棉纺织（ACT）纤维中，发现了一种新型的内置磁场增强的多硫化物捕获机制。准备ACT @ Fe / Fe3C /石墨烯硫基质。与纯ACT / S阴极相比，定制设计的液体池中多硫化物的扩散行为存在显着差异，从而证明了新型的捕集机理。此外，使用ACT @ Fe / Fe3C / S阴极组装的电池具有约764 mAh g（-1）的高初始放电容量，出色的倍率性能以及使用ACT @ Fe / Fe3C的600个循环的显着长寿命/ S（而使用纯ACT / S只能实现100个周期）。新的磁场增强捕集机制不仅提供了新颖的见解，而且还为缓解多硫化物的“穿梭效应”提供了新的可能性，从而促进了Li-S电池的实际应用。

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