Zhou Yan, Yao Zhujun, Zhang Hongliang, Zhang Xiaoxiao, Jia Qixiang, Song Shanshan, Sun Junjie, Qi Meili, Yang Yefeng
School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China.
School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China; Institute of Wenzhou, Zhejiang University, Wenzhou 325006, China.
J Colloid Interface Sci. 2025 Sep 15;694:137699. doi: 10.1016/j.jcis.2025.137699. Epub 2025 Apr 24.
Tin disulfide (SnS) with its high capacity and suitable interlayer spacing, is a promising anode for sodium-ion batteries (SIBs), but its substantial volume expansion during sodium insertion and sluggish ion and electron transfer kinetics in bulk materials limit its broader application. Herein, SnS/NiS particles are encapsulated in hollow nitrogen-doped carbon nanofibers (SnS/NiS@HCNFs) by the combination of coaxial electrostatic spinning and carbonization/sulfurization processes. The hollow channel structure of the carbon skeleton creates a three-dimensional pathway that facilitates rapid electron transmission and provides buffer space for volume changes, enhancing structural stability. Additionally, the interface electric field generated by the SnS/NiS heterojunction accelerates Na transfer, as supported by findings from density functional theory (DFT) calculations and galvanostatic intermittent titration techniques (GITT). Together, the hollow structure and heterojunction contribute to improved reaction kinetics. As a result, the SnS/NiS@HCNFs composite exhibits outstanding cycling stability with a capacity of 315 mA h g over 1000 cycles at 2 A g. Moreover, the assembled SnS/NiS@HCNFs//NaV(PO) full-cell delivers a high reversible capacity of 186 mA h g after 500 cycles at 1 A g. This study offers a valuable approach for the rational design of heterostructured anodes aimed at enhancing the efficiency of SIBs.
二硫化锡（SnS）具有高容量和合适的层间距，是一种很有前景的钠离子电池（SIBs）负极材料，但其在嵌入钠过程中的大量体积膨胀以及块状材料中缓慢的离子和电子转移动力学限制了其更广泛的应用。在此，通过同轴静电纺丝与碳化/硫化过程相结合，将SnS/NiS颗粒封装在中空氮掺杂碳纳米纤维（SnS/NiS@HCNFs）中。碳骨架的中空通道结构创造了一个三维路径，有利于快速电子传输，并为体积变化提供缓冲空间，增强了结构稳定性。此外，SnS/NiS异质结产生的界面电场加速了Na的转移，密度泛函理论（DFT）计算和恒电流间歇滴定技术（GITT）的结果支持了这一点。中空结构和异质结共同有助于改善反应动力学。因此，SnS/NiS@HCNFs复合材料表现出出色的循环稳定性，在2 A g下1000次循环中容量为315 mA h g。此外，组装的SnS/NiS@HCNFs//NaV(PO)全电池在1 A g下500次循环后具有186 mA h g的高可逆容量。这项研究为合理设计旨在提高SIBs效率的异质结构负极提供了一种有价值的方法。
