Robust Bismuth Nanoscrolls for High‐Rate and Durable Sodium‐Ion Batteries

Bismuth‐based alloying materials have emerged as highly promising anodes for sodium‐ion batteries (SIBs) due to their high theoretical specific capacity, superior volumetric capacity, and suitable operating voltage; however, substantial volume variation during alloying/dealloying and sluggish reaction kinetics critically compromise their cycling stability. To simultaneously address these challenges, this study designed and engineered a unique bismuth nanoscroll (BNR) structure derived from self‐assembled nanosheet scrolling. This architecture substantially enlarges the electrochemically active surface area relative to commercial bismuth powder, thereby facilitating efficient reversible Na + intercalation/deintercalation. Consequently, the BNR anode delivers exceptional sodium storage performance: it achieves a remarkable 99.71% capacity retention after 900 cycles at 1A g −1 and demonstrates ultra‐long cycling stability for 2500 cycles even at a high rate of 2 A g −1 . Furthermore, a full cell configured with the BNR anode paired with a Na 3 V 2 (PO 4 ) 3 (NVP) cathode maintains a stable capacity of 243.27 mAh g −1 following 250 cycles at 0.1 A g −1 . Beyond introducing a novel synthesis strategy for high‐performance bismuth nanowires that exhibit exceptional cyclability in SIBs, this work provides pivotal insights for developing advanced electrode materials targeting high‐energy‐density and long‐cycle‐life sodium‐ion batteries.