TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The iodide is sodium iodide, potassium iodide or lithium iodide, the solvent is 3 - methoxy-propionitrile, acetonitrile, gamma -butyrolactone, the ionic liquid is 1-methyl-3- butylammonium iodide, 1,3-dimethyl imidazolium iodide, or 1-methyl-3-propyl iodide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method involves dissolving vinylimidazole monomer and acrylate monomer in a solvent, forming a vinylimidazole monomer and acrylate monomer solution, mixing initiator in a solvent, adding ethylene-hexafluoropropylene with the solvent to form mixture purged with nitrogen, raising the temperature, further adding poly-vinylidene fluoride, vinyl imidazole monomer and acrylate monomer solution to the mixture, preparing initiator solution by reacting poly (vinyl imidazole-acrylate)/poly (vinylidene fluoride-hexafluoropropylene) blends, where the poly (vinyl imidazol- acrylate) has a structure of formula (II), mixing iodide and solvent, stirring to give iodide electrolyte solution, adding the obtained poly (vinyl imidazole-acrylate)/poly (vinylidene fluoride- hexafluoropropylene ) blend to the electrolyte solution, followed by adding ionic liquid in a sealed environment at 60-75 degrees C, heating, stirring, and cooling to room temperature to obtain a finished product. The method further involves executing purification step after completion of reaction of poly (vinyl imidazole-acrylate)/poly (vinyl fluoride-hexafluoropropylene), and spin drying the solvent and vacuum dried to constant weight.x: y=10:(20-320).Preferred Composition: The weight ratio of the poly (vinyl imidazole-acrylate)/poly (vinylidene fluoride-ethylene-hexafluoropropylene) blend is 1:(6.7-15.7). The mass ratio of the vinylimidazole monomer: acrylate monomer: initiator: poly (vinylidene fluoride-hexafluoropropylene ): solvent is 1:(2-8):(0.03-0.10):(2-36):(5-70). Preferred Components: The vinylimidazole monomer is N-vinyl imidazole, the acrylate monomer is methyl methacrylate acetate, methyl acrylate, butyl acrylate, butyl methacrylate, hydroxyethyl methacrylate, acrylate, hydroxypropyl acrylate, acrylic acid fluoroalkyl heptyl acrylate, or methacrylic acid fluoroalkyl heptyl ester, the solvent is tetrahydrofuran, toluene , chloroform, or acetone, and the initiator is azobisisobutyronitrile, azobis isoheptyl nitrile, dibenzoyl peroxide.