Synthesis of Hollow SnO₂/SnS₂ Hybrids and their Application in Sodium-Ion Batteries

Alloying-type Sn material has been considered as an excellent anode material for sodium-ion batteries (SIBs). However, the limitation of capacity is still a challenge that remains to be solved. In this approach, we introduce a facile two-step hydrothermal route to prepare hollow SnO₂/SnS₂ hybrids and investigate their electrochemical performances as anodes in SIBs for the first time. Benefiting from their structural features, the hollow SnO₂/SnS₂ hybrids exhibit a high reversible sodium storage capacity of about 485.64 mA h g⁻¹ at 300 mA g⁻¹ after 100 cycles with a capacity retention of 78.7 %, which is much higher than 25.9 % for bare SnO₂ hollow spheres and 28.5 % for bare SnS₂ nanosheets. Taking into consideration the outstanding performance and the special structural design, this work could provide a potential strategy to improve the electrochemical performances of tin-based electrodes, as well as that of other anodes in SIBs.