A High‐Performance Alloy‐Based Anode Enabled by Surface and Interface Engineering for Wide‐Temperature Sodium‐Ion Batteries

Alloy-based anodes have shown great potential to be applied in sodium-ion batteries (SIBs) due their high theoretical capacities, suitable working potential, and abundant earth reserves. However, practical applications are severely impeded by large volume expansion, unstable solid-electrolyte interfaces (SEI), sluggish reaction kinetics during cycling. Herein, a surface engineering of tin nanorods via N-doped carbon layers ([email protected]) an interface strategy improve the electrochemical performance SIBs reported. In particular, authors demonstrate that uniform modification can effectively facilitate electron sodium transport kinetics, confine alloy pulverization, simultaneously synergize interactions with ether-based electrolyte form robust organic-inorganic SEI. Moreover, it is discovered diethylene glycol dimethyl ether strong stability optimized Na+ solvation structure co-embed layer achieve fast kinetics. Consequently, [email protected] deliver extra-long cycling more than 10 000 cycles. The full cell Na3V2(PO4)3║[email exhibits energy density (215 Wh kg−1), excellent high-rate capability (reaches 80% capacity 2 min), long cycle life over wide temperature range −20 50 °C.