▎ 摘　　要

Nanoscale SnSb alloys exhibit lower expansion rates and outstanding electrochemical properties, owing to the synergy between Sn and Sb for anode materials of sodium-ion batteries. However, nanomaterials with a high surface energy tend to aggregate and form larger secondary particles, limiting their further application. Herein, SnSb nanoparticles are prepared and distributed in three-dimensional networks of N-doped reduced graphene oxide (3D-rNGO), which plays a crucial role in inhibiting the agglomeration of SnSb nanoparticles, thereby promoting the capacitive contribution of surface drive. More importantly, the three-dimensional structure has a high specific surface area and the active region introduced by N doping can contact and adsorb more sodium ions as part of the electrochemical behavior, making the SnSb/3D-rNGO anode not only contribute capacity through a diffusion process, but also provide a capacitive contribution through a surface-driven mechanism. The results of the electrochemical analysis showed that SnSb/3D-rNGO, as the anode of a sodium-ion battery, exhibits a high specific capacity of 1169.6 mAh g(-1), a reversible capacity of 55 % at 0.1 C, and maintains a capacity of 479.3 mAh g(-1) after 200 cycles. It is suitable for energy storage precisely because of the double capacity contribution mechanism.