Metal selenides owing to their high theoretical capacity and good conductivity are considered as one of the potential candidates for the anode materials of sodium-ion batteries (SIBs). However, their practical applications are greatly restricted by the poor cycling performances and complicated synthesis methods. In this work, a sandwich-like SnSe₂/reduced graphene oxide (rGO) composite with a small amount of rGO (7.3%) is synthesized by a simple one-pot solvothermal technique. The as-synthesized SnSe₂/rGO shows improved initial coulombic efficiency (ICE) of 73.7%, high capacity of 402.0 mAh g⁻¹ after 150 cycles at 0.1 A g⁻¹ with a retention of 86.2% and outstanding rate performances. The abundant Sn−O−C bonds of synthesized material not only accelerate the charge transfer at the interface but also enhance the mechanical strength to accommodate volume variation and prevent active material loss during cycling. Moreover, the compact structure leads to thin solid electrolyte interface (SEI) so that high initial coulombic efficiency was obtained. Furthermore, full cells are assembled to test its potential application. This work offers a simple method to synthesize SnSe₂/rGO as a candidate anode for SIBs.

金属硒化物由于其较高的理论容量和良好的导电性，被认为是钠离子电池（SIB）负极材料的潜在候选材料之一。然而，其不良的循环性能和复杂的合成方法极大地限制了它们的实际应用。在这项工作中，通过简单的一锅溶剂热技术合成了具有少量rGO（7.3％）的三明治状SnSe ₂ /还原氧化石墨烯（rGO）复合材料。合成后的SnSe ₂ / rGO的初始库仑效率（ICE）提高了73.7％，在0.1 A g ^-1下经过150次循环后具有402.0 mAh g ^-1的高容量保留率达86.2％，表现出色。合成材料的大量Sn-OC键不仅可以加速界面处的电荷转移，还可以提高机械强度以适应体积变化并防止活性物质在循环过程中流失。此外，紧凑的结构导致薄的固体电解质界面（SEI），从而获得了高的初始库伦效率。此外，组装完整的电池以测试其潜在的应用。这项工作提供了一种简单的方法来合成SnSe ₂ / rGO作为SIB的候选阳极。