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Ether-compatible sulfurized polyacrylonitrile cathode with excellent performance enabled by fast kinetics via selenium doping.
Nature Communications ( IF 14.7 ) Pub Date : 2019-03-04 , DOI: 10.1038/s41467-019-08818-6
Xin Chen 1, 2 , Linfeng Peng 1 , Lihui Wang 1, 2 , Jiaqiang Yang 2 , Zhangxiang Hao 2 , Jingwei Xiang 2 , Kai Yuan 2 , Yunhui Huang 2 , Bin Shan 2 , Lixia Yuan 2 , Jia Xie 1
Nature Communications ( IF 14.7 ) Pub Date : 2019-03-04 , DOI: 10.1038/s41467-019-08818-6
Xin Chen 1, 2 , Linfeng Peng 1 , Lihui Wang 1, 2 , Jiaqiang Yang 2 , Zhangxiang Hao 2 , Jingwei Xiang 2 , Kai Yuan 2 , Yunhui Huang 2 , Bin Shan 2 , Lixia Yuan 2 , Jia Xie 1
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Sulfurized polyacrylonitrile is suggested to contain Sn (n ≤ 4) and shows good electrochemical performance in carbonate electrolytes for lithium sulfur batteries. However inferior results in ether electrolytes suggest that high solubility of Li2Sn (n ≤ 4) trumps the limited redox conversion, leading to dissolution and shuttling. Here, we introduce a small amount of selenium in sulfurized polyacrylonitrile to accelerate the redox conversion, delivering excellent performance in both carbonate and ether electrolytes, including high reversible capacity (1300 mA h g-1 at 0.2 A g-1), 84% active material utilization and high rate (capacity up to 900 mA h g-1 at 10 A g-1). These cathodes can undergo 800 cycles with nearly 100% Coulombic efficiency and ultralow 0.029% capacity decay per cycle. Polysulfide dissolution is successfully suppressed by enhanced reaction kinetics. This work demonstrates an ether compatible sulfur cathode involving intermediate Li2Sn (n ≤ 4), attractive rate and cycling performance, and a promising solution towards applicable lithium-sulfur batteries.
中文翻译:
与醚兼容的硫化聚丙烯腈阴极,通过硒掺杂实现快速动力学,具有优异的性能。
硫化聚丙烯腈建议含有Sn(n≤4),在锂硫电池碳酸盐电解液中表现出良好的电化学性能。然而,醚电解质中的较差结果表明,Li2Sn (n ≤ 4) 的高溶解度胜过有限的氧化还原转化,导致溶解和穿梭。在这里,我们在硫化聚丙烯腈中引入少量的硒来加速氧化还原转化,在碳酸盐和醚电解质中提供优异的性能,包括高可逆容量(0.2 A g-1 时为 1300 mAh g-1)、84% 活性材料利用率高且倍率高(10 A g-1 时容量高达 900 mAh g-1)。这些阴极可以经历 800 次循环,库伦效率接近 100%,每个循环容量衰减超低 0.029%。通过增强的反应动力学成功地抑制了多硫化物的溶解。这项工作展示了一种涉及中间体 Li2Sn (n ≤ 4) 的与醚相容的硫正极,具有有吸引力的倍率和循环性能,以及适用的锂硫电池的有前途的解决方案。
更新日期:2019-03-04
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
与醚兼容的硫化聚丙烯腈阴极,通过硒掺杂实现快速动力学,具有优异的性能。
硫化聚丙烯腈建议含有Sn(n≤4),在锂硫电池碳酸盐电解液中表现出良好的电化学性能。然而,醚电解质中的较差结果表明,Li2Sn (n ≤ 4) 的高溶解度胜过有限的氧化还原转化,导致溶解和穿梭。在这里,我们在硫化聚丙烯腈中引入少量的硒来加速氧化还原转化,在碳酸盐和醚电解质中提供优异的性能,包括高可逆容量(0.2 A g-1 时为 1300 mAh g-1)、84% 活性材料利用率高且倍率高(10 A g-1 时容量高达 900 mAh g-1)。这些阴极可以经历 800 次循环,库伦效率接近 100%,每个循环容量衰减超低 0.029%。通过增强的反应动力学成功地抑制了多硫化物的溶解。这项工作展示了一种涉及中间体 Li2Sn (n ≤ 4) 的与醚相容的硫正极,具有有吸引力的倍率和循环性能,以及适用的锂硫电池的有前途的解决方案。