Multifunctional bio-based hydrogel electrolyte and preparation method and application thereof

The invention relates to the field of hydrogel electrolyte, in particular to multifunctional bio-based hydrogel electrolyte as well as a preparation method and application thereof. The preparation method of the multifunctional bio-based hydrogel electrolyte comprises the following steps: preparing a peach gum polysaccharide aqueous solution; and adding a water-retaining agent, an ionic compound and a cross-linking agent to obtain the multifunctional bio-based hydrogel electrolyte with good self-repairing property, low temperature resistance and flame retardance. The preparation method is simple in process, uses water as a solvent, is low in industrial cost, adopts raw materials which are pollution-free to the environment, are biodegradable, and is suitable for industrial large-scale production. And the multifunctional bio-based hydrogel electrolyte is applied to the flexible capacitor, so that the self-repairing property, flame retardance and low-temperature cycling stability of the device under a low-tempera