▎ 摘　　要

NOVELTY - Preparation of high-strength self-healing hydrogel electrolyte comprises dissolving methacrylamide, acrylic acid, and potassium persulfate in deionized water to form uniform solution as prepolymer solution, pouring argon gas into prepolymer solution, injecting solution into mold, placing mold in thermostat for heating and polymerization to form hydrogel film, taking out hydrogel film, soaking in deionized water until hydrogel film reaches constant swelling equilibrium state to obtain poly(methacrylamide-co-acrylic acid) hydrogel, preparing salt solution separately, and soaking poly(methacrylamide-co-acrylic acid) hydrogel in salt solution until it reaches swelling equilibrium state of constant mass to obtain poly(methacrylamide-co-acrylic acid) hydrogel electrolyte membrane. USE - The method is used for preparing high-strength self-healing hydrogel electrolyte for flexible supercapacitor (claimed). ADVANTAGE - The product has high strength, flexibility and self-healing. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of flexible supercapacitor comprising designing snake-shaped interdigital electrode structure, determining geometric parameters of snake-shaped interdigital electrode structure, printing designed snake-shaped interdigital electrode structure on film by a laser printer to make mask, cutting poly(methacrylamide-co-acrylic acid) hydrogel electrolyte membrane to same size as mask, covering hydrogel electrolyte membrane with mask, coating graphene slurry on surface of mask to form patterned electrode, solidifying, recoating solidified graphene slurry with layer of silver-silver chloride paste as current collector, tearing off mask, solidifying silver-silver chloride paste at room temperature, drawing out two wires on positive and negative electrodes of snake-shaped interdigitated electrode structure, pasting layer of polyacrylic acid on upper and lower surfaces of overall structure, and using ester tape for encapsulation.