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FeS2 Nanoparticles Encapsulated in N/S-Doped Hollow Carbon Spheres as Anode Materials for Potassium-Ion Batteries
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-04-23 , DOI: 10.1021/acsanm.1c00434 Jiahao Ju 1, 2 , Anding Xu 3, 4 , Yang Song 1, 2 , Hao Sun 1, 2 , Lili Fu 1, 2 , Yurong Yan 3, 4 , Songping Wu 1, 2
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-04-23 , DOI: 10.1021/acsanm.1c00434 Jiahao Ju 1, 2 , Anding Xu 3, 4 , Yang Song 1, 2 , Hao Sun 1, 2 , Lili Fu 1, 2 , Yurong Yan 3, 4 , Songping Wu 1, 2
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As the most competitive candidate to lithium-ion batteries, potassium-ion batteries (PIBs) have gained widespread attention for next-generation power storage devices owing to their superior performance and economical price. However, the electrode materials of PIBs have been suffering from a huge volume expansion caused by the large radius of K+ during potassiation/depotassiation, which leads to poor cyclic stability and rate capability. Herein, FeS2 nanoparticles anchored on the inner wall of N/S-doped hollow carbon spheres (FeS2@HCS) have been elaborately designed and fabricated by a scalable electrospray and template method. The FeS2@HCS anode exhibits a remarkable capacity of 425 mAh g–1 at 100 mA g–1 after 100 cycles, accompanied by a pimping capacity fading of 0.05% per cycle and a superior rate capacity of 302 mAh g–1 at 2.0 A g–1. Such outstanding electrochemical properties could be ascribed to the distinct microstructure of FeS2 nanoparticles anchored on the inner wall of hollow carbon spheres and the protective N/S-doped carbon shell. This work not only furnishes a convenient and scalable way to obtain high-powered electrodes for PIBs but also offers a facile way to enhance the charge transportation kinetics of yolk–shell-structured composites.
中文翻译：
封装在 N/S 掺杂中空碳球中的FeS 2纳米颗粒作为钾离子电池的阳极材料
作为锂离子电池最具竞争力的候选者，钾离子电池（PIB）因其优越的性能和经济的价格而在下一代储能设备中受到广泛关注。然而，PIBs的电极材料在钾化/脱钾过程中由于K +半径大而导致体积膨胀，导致循环稳定性和倍率性能较差。在此，通过可扩展的电喷雾和模板方法精心设计和制造了锚定在 N/S 掺杂的空心碳球 (FeS 2 @HCS)内壁上的FeS 2纳米粒子。FeS 2 @HCS 阳极在 100 mA g 下表现出惊人的 425 mAh g –1容量–1在 100 次循环后，伴随着每次循环 0.05% 的容量衰减和在 2.0 A g –1 下具有 302 mAh g –1的优异倍率容量。如此出色的电化学性能可归因于固定在空心碳球内壁和保护性 N/S 掺杂碳壳上的FeS 2纳米颗粒的独特微观结构。这项工作不仅提供了一种方便且可扩展的方法来获得用于 PIB 的高功率电极，而且还提供了一种增强蛋黄-壳结构复合材料电荷传输动力学的简便方法。
更新日期：2021-05-28
中文翻译：
封装在 N/S 掺杂中空碳球中的FeS 2纳米颗粒作为钾离子电池的阳极材料
作为锂离子电池最具竞争力的候选者，钾离子电池（PIB）因其优越的性能和经济的价格而在下一代储能设备中受到广泛关注。然而，PIBs的电极材料在钾化/脱钾过程中由于K +半径大而导致体积膨胀，导致循环稳定性和倍率性能较差。在此，通过可扩展的电喷雾和模板方法精心设计和制造了锚定在 N/S 掺杂的空心碳球 (FeS 2 @HCS)内壁上的FeS 2纳米粒子。FeS 2 @HCS 阳极在 100 mA g 下表现出惊人的 425 mAh g –1容量–1在 100 次循环后，伴随着每次循环 0.05% 的容量衰减和在 2.0 A g –1 下具有 302 mAh g –1的优异倍率容量。如此出色的电化学性能可归因于固定在空心碳球内壁和保护性 N/S 掺杂碳壳上的FeS 2纳米颗粒的独特微观结构。这项工作不仅提供了一种方便且可扩展的方法来获得用于 PIB 的高功率电极，而且还提供了一种增强蛋黄-壳结构复合材料电荷传输动力学的简便方法。
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