Confining ultrafine SnS nanoparticles in hollow multichannel carbon nanofibers for boosting potassium storage properties
Confining ultrafine SnS nanoparticles in hollow multichannel carbon nanofibers for boosting potassium storage properties
复制标题
DOI：
10.1016/j.scib.2021.09.020
复制
发表时间：
2021-12-30
期刊：
影响因子：
18.9
通讯作者：
Zhou, Xiaosi
中科院分区：
文献类型：
--
作者：
He, Yanan;Xu, Yifan;Zhou, Xiaosi
SnS因其高理论容量而被广泛研究作为钾离子电池（PIB）的潜在阳极材料。尽管如此，由于其电子传导性差和体积膨胀巨大，其循环寿命有限。这项工作提出了一种简单的方法，将 SnS 纳米晶体限制在中空多通道碳纳米纤维（表示为 SnS@HMCF）的壁中来解决上述问题。与之前的研究相比，HMCF 中紧密浸渍的超细 SnS 纳米晶体可以增加碳基体单位面积的 SnS 负载量。此外，独特的中空多通道碳纳米纤维被用作坚固的载体，以均匀分布 SnS 纳米晶体。这可以显着加速 K+/电子传输，从而使 PlB 具有大的比容量、出色的倍率性能和稳定的循环性能。 300次循环后在0.1 A g(-1)下保持415.5 mAh g(-1)的高可逆容量，1000次循环后在1 A g(-1)下保持245.5 mAh g(-1)的高可逆容量，表明SnS@HMCFs作为PLB负极材料的巨大潜力。此外，当SnS@HMCF负极与KVPO4F正极组装时，所获得的全电池在0.1 A g(-1)下循环200次后显示出165.3 mAh g(-1)的大放电容量。 (C) 2021 中国科学出版社。由 Elsevier B.V. 和中国科学出版社出版。版权所有。
SnS has been extensively investigated as a potential anode material in potassium-ion batteries (PIBs) for its high theoretical capacity. Nonetheless, it suffers a limited cyclic lifespan owing to its poor electronic conductivity and huge volume expansion. This work proposed a facile approach where SnS nanocrystals are confined in the walls of hollow multichannel carbon nanofibers (denoted SnS@HMCFs) to tackle the issues above. In contrast to previous studies, impregnated ultrafine SnS nanocrystals in HMCFs compactly can increase the SnS loading number per unit area of the carbon matrix. Furthermore, the unique hollow multichannel carbon nanofibers are used as a robust carrier to uniformly distribute the SnS nanocrystals. This can significantly accelerate K+/electron transport, resulting in large specific capacity, outstanding rate performance, and steady cycling property for PlBs. High reversible capacities of 415.5 mAh g(-1) at 0.1 A g(-1) after 300 cycles and 245.5 mAh g(-1) at 1 A g(-1) after 1000 cycles are retained, suggesting great potential of SnS@HMCFs as a negative electrode material for PlBs. Additionally, when the SnS@HMCF anode is assembled with the KVPO4F cathode, the obtained full cell shows a large discharge capacity of 165.3 mAh g(-1) after 200 cycles at 0.1 A g(-1). (C) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.