Tendril-Inspired 900% Ultrastretching Fiber-Based Zn-Ion Batteries for Wearable Energy Textiles

Flexible fiber-based Zn-ion batteries represent an ideal power platform for smart wearable energy textiles featuring safety, flexibility, and unique integration. However, the inevitably low elongation limits (<400%) of common fiber-based Zn-ion batteries may restrict applications in highly deformable wearable materials and lead to unstable energy storage performance during practical activities. Herein, an elastic graphene/polyaniline-Zn@silver fiber-based battery (eG/P-Zn@SFB) with a helical structure inspired by the biological structure of luffa tendril is reported. eG/P-Zn@SFB exhibits ultrastretching properties and can be stretched to 900% with a 71% capacity retention ratio. Moreover, the prefabricated battery delivers a high specific capacity of 32.56 mAh/cm³ at 10 mA/cm³ and an energy density of 36.04 mWh/cm³. As a proof of concept, the knitted integrated eG/P-Zn@SFB served as an effective power supply with different bending angles ranging from 0° to 180°, demonstrating potential applications and promising prospects in stretchable flexible electronics and wearable energy textiles.