Aspartame Endowed ZnO-Based Self-Healing Solid Electrolyte Interface Film for Long-Cycling and Wide-Temperature Aqueous Zn-Ion Batteries

• Aspartame additive enables in situ formation of self-healing ZnO-based SEI, enhancing Zn anode corrosion resistance and stability. • Zn║Zn symmetric cells with APM-modified electrolyte operate stably for 6,400 h at −5 °C, 10,330 h at 25 °C, and 2,250 h at 40 °C, with a high DOD of 85.2%. • Achieves 99.59% Coulombic efficiency, suppresses dendrite growth, and maintains 150 mAh g−1 capacity after 1,750 cycles in NH4+-V2O5 full cells. • Provides a straightforward electrolyte engineering strategy for dendrite-free, wide-temperature aqueous Zn-ion batteries.