Abstract
The rapid growth of wearable electronic devices has spurred the development of flexible energy storage systems. However, the limitations of conventional rigid commercial batteries have hindered the advancement of wearable technology. Consequently, the development of stable, safe, highly flexible, and cost-effective flexible batteries has become a key focus in current battery research. Herein, we introduce a novel multifunctional flexible Prussian Blue–zinc battery utilizing a PVA-ZnCl₂ polymer gel electrolyte (EGPE) enhanced with ethanolamine (ETA), aimed at addressing the deficiencies of traditional electrolytes in terms of safety and mechanical performance. The Zn||Zn symmetric cell using EGPE electrolyte demonstrated an impressive long-term cycling stability of over 3000 hours at a current density of 0.15 mA cm−2. In contrast, the symmetrical cell using 0.8 M ZnCl2 aqueous electrolyte maintained its stability for only 400 hours. In addition, the prepared flexible zinc Prussian blue device maintained more than 65 % of its initial capacity of the device and its coulombic efficiency was close to 100 % after 400 cycles at an extreme current density of 10 A g−1. Furthermore, flexible device using the EGPE was able to maintain a stable power supply under various bending, torsion, folding and shearing conditions. Such innovative gel electrolyte demonstrated considerable prospects for utilisation in portably equipped devices and energy storage systems.
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