Binder Free NiP‐Textile Electrodes for Ultrahigh Capacity and 40,000 Cycle Stability in Battery Supercapacitor Hybrid

Advancement of flexible, high‐capacity energy storage systems is vital for next‐generation wearable electronics. Cotton cloth with its intrinsic flexibility, porosity, & electrolyte absorption ability, offers an ideal platform, but its insulating nature necessitates functional enhancement. Herein, we report a dual‐function, conductive textile electrode (NiP@Ni/NiB‐CC) synthesized via electroless followed by electrodeposition eliminating binder serves as both active material & current collector. The designed flexible electrode exhibits an excellent conductivity (1.07 ×10 4 S m − 1 ) & demonstrated an ultrahigh specific capacitance of 2446 F g − 1 with 130% capacitance retention over 10,000 cycles at a practical mass loading of 10.1 mg cm − 2 & delivers an areal capacitance of 45.5 F cm − 2 at 27.3 mg cm − 2 . As a current collector for mango‐seed‐derived activated carbon (MSAC), it enables remarkable stability over 40,000 cycles with 94% retention at 100 mA cm − 2 and retained 77% capacitance after repetitive mechanical deformations by 1000 bending cycles. The assembled cotton‐cloth battery‐supercapacitor hybrid (CC‐BSH) exhibits an energy density of 441 µWh cm − 2 & power density of 37.5 mW cm −2 . Further two flexible CC‐BSH devices successfully powered an LED panel (36 red LEDs) for over 2 h, 50 green LEDs & 50 yellow LEDs showcasing a sustainable, scalable approach for high‐performance flexible energy storage.