• • Achieved near-theoretical specific capacity of 418.3 mAh g−1 in four-electron FZIBs, representing ~100% utilization of iodine species and a 1.8-fold increase over conventional two-electron systems, critical for meeting energy density demands of wearable devices.
• • Demonstrated exceptional cycling stability exceeding 20,000 charge/discharge cycles at a high current density of 20.0 A g−1, with capacity retention not explicitly stated but implied stable, outperforming typical aqueous batteries that fade within thousands of cycles, thus enabling long-lifetime wearable electronics.
• • The quaternary ammonium (Ch+) coordination strategy simultaneously suppresses I+ hydrolysis and zinc dendrite growth, addressing both cathode and anode failure modes, a dual-function approach that reduces manufacturing complexity and cost compared to separate electrolyte additives.
• • Successful integration into electronic textiles with glucose and cardiac rhythm sensors validates practical applicability, showing stable operation under real-world wearable conditions, a key step toward commercial smart textiles.