Tin selenide (SnSe) has been explored as a promising anode material for sodium ion batteries (SIBs) but its electrochemical performance is strictly limited by the large volume variation during charge/discharge process and relatively low electronic conductivity. In this work, hierarchical Cu doped SnSe nanoclusters were prepared by a cost-efficient and nontoxic method and demonstrated as a high-performance anode for SIBs. Under optimized Cu doping degree (10 wt% Cu), the developed Cu-SnSe anode exhibits excellent rate performance with a high capacity of 330 mAh/g at 20 A/g and outstanding stability with a capacity of 304 mAh/g after 1000 cycles at 5 A/g (0.1–3.0 V vs. Na/Na⁺). The enhanced electronic conductivity, facilitated sodiation/desodiation process, and relieved volume change during cycling in Cu doped SnSe benefited from Cu doping and the unique hierarchical structure should account for its extraordinary sodiun storage performance.

硒化锡（SnSe）已被开发为钠离子电池（SIB）的有希望的负极材料，但其电化学性能受到充电/放电过程中较大的体积变化和相对较低的电导率的严格限制。在这项工作中，分层铜掺杂的SnSe纳米团簇是通过经济高效且无毒的方法制备的，并被证明是用于SIB的高性能阳极。在优化的Cu掺杂度（10 wt％Cu）下，开发的Cu-SnSe阳极具有出色的速率性能，在20 A / g时具有330 mAh / g的高容量，在1000次循环后具有304 mAh / g的出色稳定性。在5 A / g（0.1–3.0 V相对于Na / Na ⁺）。受益于Cu掺杂，Cu掺杂的SnSe中增强的电子电导率，便利的沉积/脱氮过程以及缓解的循环过程中的体积变化，这得益于Cu掺杂，独特的分层结构应能说明其非凡的Sodun储存性能。