1 Centro de Investigación y Desarrollo Tecnológico en Electroquímica S. C., Pedro Escobedo, Querétaro C. P. 76703, México.
2 Centro de Investigación en Materiales Avanzados S. C., Complejo Industrial Chihuahua, Chihuahua, C. P. 31136, México.
3 Facultad de Ingeniería, División de Investigación y Posgrado, Universidad Autónoma de Querétaro, Querétaro C. P. 76010, México.
4 Canadian Light Source, 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N 2 V3, Canada.
5 Department of Chemical and Materials Engineering, Concordia University, Montreal, QC H3G 1M8, Canada.

Flexible and safe energy storage systems are critical for the advancement of wearable and portable electronics. Although lithium-ion batteries dominate the market, their reliance on flammable electrolytes and rigid structures limits their use in flexible applications. Herein, we report the development of a flexible Zn-air battery featuring a nitrogen-doped lamellar carbon cathode embedded with Ni single-atom catalytic sites. The battery demonstrated a high areal capacity of ~32 mA·h cm^-2 and sustained stable operation over nearly 325 charge-discharge cycles. It also achieved a maximum discharge current density of 150 mA cm^-2 under the polarization conditions. In the half-cell configuration, the optimized Ni-N_x catalyst exhibited a low overpotential of 1.45 V vs. RHE at 10 mA cm^-2 for the oxygen evolution reaction, outperforming the benchmark IrO₂ catalyst (1.49 V vs. RHE). The full cell maintained excellent electrochemical stability across a broad temperature range (5-60 °C) and retained its functionality under severe mechanical deformation, including bending, cutting, and puncturing. Postcycling SEM analysis revealed the formation of vertically aligned Zn nanostructures that effectively suppressed dendrite growth.