Abstract:In recent years, a great deal of research has been invested in the design and fabrication direction of flexible zinc ion batteries due to their good capacity, wearability, intrinsic safety and functional controllability. Hydrogel electrolyte, as the most critical component of flexible zinc-ion battery, retains the high ionic conductivity of aqueous electrolyte and the dimensional stability of solid polymer electrolyte. This electrolyte not only has excellent mechanical flexibility and elasticity, which can adapt to various deformations without affecting battery performance, but also has excellent ion conductivity, ensuring efficient charging and discharging of the battery. In the fields of wearable electronic devices, portable power supplies and flexible electronic screens, the hydrogel electrolyte of flexible zinc ion batteries can significantly improve the flexibility and reliability of devices, providing users with a more convenient and comfortable use experience. In addition, its low cost and environmental friendliness make it one of the important development directions for future energy storage technologies. However, the research of hydrogel electrolyte for flexible zinc ion battery is still in its early stage, and it still faces great challenges under extreme application conditions. The purpose of this paper was to analyze the advantages and disadvantages of hydrogel electrolyte used in flexible zinc-ion batteries, and point out the challenges faced by hydrogel electrolyte under extreme conditions of high temperature, low temperature and deformation, as well as the corresponding current improvement measures. Finally, the corresponding extreme conditions were analyzed and constructive solutions were put forward.