Intermolecular Stabilization Enables Long-Life, Low-Temperature-Resilient Amino-Anthraquinone Anodes for Sodium-Ion Batteries

Organic electrode materials (OEMs) are promising for sodium-ion batteries but often suffer from dissolution and poor durability. We report a bis-anthraquinone anode, DABT, in which amino groups lower the redox potential and form hydrogen bonds to suppress dissolution. DABT delivers ∼245 mAh g –1 at an average voltage of ∼1.54 V, with an initial Coulombic efficiency of 98% and 79% capacity retention after 2500 cycles at 2C. Ex situ characterizations reveal a reversible C═O ↔ C–O conversion, coordinating Na + at four carbonyl sites. Paired with a Na 3 V 2 (PO 4 ) 3 cathode, the full cell achieves 160 mAh g –1 at 0.5C with an average voltage of ∼1.5 V, retaining >60% capacity after 500 cycles at 5C. Notably, the DABT//Na 3 V 2 (PO 4 ) 3 full cell retains 84% capacity at −20 °C after 100 cycles, underscoring robust low-temperature performance. This study provides a concise molecular-engineering strategy for high-performance organic anodes and advances the practical deployment of SIBs.