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首页> 外文期刊>Advanced energy materials >A Nonflammable and Thermotolerant Separator Suppresses Polysulfide Dissolution for Safe and Long-Cycle Lithium-Sulfur Batteries
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A Nonflammable and Thermotolerant Separator Suppresses Polysulfide Dissolution for Safe and Long-Cycle Lithium-Sulfur Batteries

机译：不可燃且耐高温的隔膜可抑制多硫化物的溶解，从而可确保安全和长周期的锂硫电池

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摘要

Lithium-sulfur (Li-S) batteries are of considerable research interest for their application potentials in high-density energy storage. However, the practical application of Li-S batteries is severely plagued by polysulfide (PS) dissolution and serious safety concerns caused by flammable sulfur and polymer separators. Herein, a nonflammable multifunctional separator for efficient suppression of PS dissolution and high-temperature performance of Li-S batteries is reported. Polyacrylonitrile (PAN) and ammonium polyphosphate (APP) are electrospun into a multifunctional separator (PAN@APP) for stable and safe Li-S batteries. Owing to the abundant amine groups and phosphate radical in APP, the PAN@APP separator has strong binding interactions with PS, which exerts strong charge repulsion to suppress the transport of negatively charged PS ions and free radicals. Furthermore, refractory APP ensures the stability of the battery at high temperatures. Using the PAN@APP separator, the Li-S battery demonstrates a capacity retention of 83% over 800 cycles. This work provides a robust materials platform for stable and safe Li-S batteries and points to a direction to close the current gap facing the commercialization of high-energy next-generation electrochemical conversion/storage devices.
机译：锂硫（Li-S）电池因其在高密度能量存储中的应用潜力而引起了广泛的研究兴趣。然而，Li-S电池的实际应用受到多硫化物（PS）溶解和易燃硫磺及聚合物隔板引起的严重安全问题的严重困扰。本文中，报道了用于有效抑制PS溶解和Li-S电池的高温性能的不可燃多功能隔板。将聚丙烯腈（PAN）和聚磷酸铵（APP）静电纺丝成多功能隔板（PAN @ APP），以制造稳定安全的Li-S电池。由于APP中具有丰富的胺基和磷酸根，PAN @ APP分隔物与PS具有很强的结合作用，从而产生强的电荷排斥力，从而抑制了带负电的PS离子和自由基的迁移。此外，耐火APP可确保电池在高温下的稳定性。使用PAN @ APP隔膜，Li-S电池在800个循环中显示出83％的容量保持率。这项工作为稳定和安全的Li-S电池提供了一个强大的材料平台，并指出了缩小当前高能下一代电化学转化/存储设备商业化差距的方向。

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