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Enhanced Cyclic Stability of Sulfur Electrode by a Li-Nafion-Supported Encapsulated Configuration
Energy Technology ( IF 3.6 ) Pub Date : 2021-07-01 , DOI: 10.1002/ente.202100418 Zhong Li 1 , Peiyue Yang 1 , Qiyun Pan 1 , Shan Jiang 1 , Linjie Jiang 1 , Yisi Liu 1 , Guodong Xu 2 , Yazhou Chen 3
Energy Technology ( IF 3.6 ) Pub Date : 2021-07-01 , DOI: 10.1002/ente.202100418 Zhong Li 1 , Peiyue Yang 1 , Qiyun Pan 1 , Shan Jiang 1 , Linjie Jiang 1 , Yisi Liu 1 , Guodong Xu 2 , Yazhou Chen 3
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Lithium–sulfur batteries are deemed to have the opportunity to replace lithium-ion batteries because of their high energy density. Nonetheless, the shuttling of soluble long-chain polysulfides severely deteriorates the cyclic performances of the batteries. Herein, an encapsulated sulfur electrode to tackle the shuttle effect is designed. This high-performance electrode is fabricated by encapsulating the active sulfur inside a sealing configuration composed of lithiated Nafion (Li-Nafion), carbon black (BP2000), and a binder of polytetrafluoroethylene. The dense surface of the encapsulated configuration can physically obstruct the mobility of soluble polysulfides. Meanwhile, the sulfonic acid groups fixed on the Li-Nafion backbone provide a robust electrostatic repulsion to inhibit the negatively charged polysulfides from migrating into the electrolyte. Therefore, the encapsulated sulfur electrode delivers 522.6 mAh g−1 at the 600th cycle with a retention of 80.36%, exhibiting a more competitive cyclic stability than the pristine sulfur electrode.
中文翻译：
通过 Li-Nafion 支持的封装配置增强硫电极的循环稳定性
锂硫电池因其高能量密度被认为有机会取代锂离子电池。尽管如此，可溶性长链多硫化物的穿梭严重降低了电池的循环性能。在此，设计了一种用于解决穿梭效应的封装硫电极。这种高性能电极是通过将活性硫封装在由锂化 Nafion (Li-Nafion)、炭黑 (BP2000) 和聚四氟乙烯粘合剂组成的密封结构中制成的。封装结构的致密表面会在物理上阻碍可溶性多硫化物的迁移。同时，固定在 Li-Nafion 骨架上的磺酸基团提供了强大的静电排斥力，以抑制带负电荷的多硫化物迁移到电解质中。因此，封装的硫电极提供 522.6 mAh g-1在第 600 次循环时保留率为 80.36%，表现出比原始硫电极更具竞争力的循环稳定性。
更新日期：2021-09-09
中文翻译：
通过 Li-Nafion 支持的封装配置增强硫电极的循环稳定性
锂硫电池因其高能量密度被认为有机会取代锂离子电池。尽管如此，可溶性长链多硫化物的穿梭严重降低了电池的循环性能。在此，设计了一种用于解决穿梭效应的封装硫电极。这种高性能电极是通过将活性硫封装在由锂化 Nafion (Li-Nafion)、炭黑 (BP2000) 和聚四氟乙烯粘合剂组成的密封结构中制成的。封装结构的致密表面会在物理上阻碍可溶性多硫化物的迁移。同时，固定在 Li-Nafion 骨架上的磺酸基团提供了强大的静电排斥力，以抑制带负电荷的多硫化物迁移到电解质中。因此，封装的硫电极提供 522.6 mAh g-1在第 600 次循环时保留率为 80.36%，表现出比原始硫电极更具竞争力的循环稳定性。
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