Tin selenides have been attracting great attention as anode materials for the state-of-the-art rechargeable sodium-ion batteries (SIBs) due to their high theoretical capacity and low cost. However, they deliver unsatisfactory performance in practice, owing to their intrinsically low conductivity, sluggish kinetics and volume expansion during the charge-discharge process. Herein, we demonstrate the synthesis of SnSe₂ nanocrystals coupled with hierarchical porous carbon (SnSe₂ NCs/C) microspheres for boosting SIBs in terms of capacity, rate ability and durability. The unique structure of SnSe₂ NCs/C possesses several advantages, including inhibiting the agglomeration of SnSe₂ nanoparticles, relieving the volume expansion, accelerating the diffusion kinetics of electrons/ions, enhancing the contact area between the electrode and electrolyte and improving the structural stability of the composite. As a result, the as-obtained SnSe₂ NCs/C microspheres show a high reversible capacity (565 mA h g⁻¹ after 100 cycles at 100 mA g⁻¹), excellent rate capability, and long cycling life stability (363 mA h g⁻¹ at 1 A g⁻¹ after 1000 cycles), which represent the best performances among the reported SIBs based on SnSe₂-based anode materials.

硒化锡由于其高的理论容量和低成本而作为最先进的可再充电钠离子电池（SIB）的负极材料备受关注。然而，由于它们固有的低电导率，缓慢的动力学和在充电-放电过程中的体积膨胀，它们在实践中表现不令人满意。在本文中，我们证明了SnSe ₂纳米晶体与分级多孔碳（SnSe ₂ NCs / C）微球结合的能力，速率能力和耐久性方面的增强，从而增强了SIBs的合成。SnSe ₂ NCs / C的独特结构具有许多优势，包括抑制SnSe ₂的团聚纳米粒子，减轻了体积膨胀，加速了电子/离子的扩散动力学，增加了电极与电解质之间的接触面积，并改善了复合材料的结构稳定性。其结果是，在作为得到的位SnSe _2组的NC / C的微球显示出高的可逆容量（565毫安汞柱^-1在100mA克100次循环后^-1），优良的倍率性能，并循环寿命长稳定性（363毫安汞^{- 1} 1 A G ^-1 1000次循环后），其代表基于位SnSe所报告的SIB中的最佳性能₂系负极材料。