TECHNOLOGY FOCUS - POLYMERS - The hydroxyl group-containing component is a component including two or more hydroxyl groups or a mixture of compounds including various numbers of hydroxyl groups, and consists of polyethylene glycol, polypropylene glycol, and polytetramethylene glycol.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The process further includes polymerizing a dried hydroxyl group-containing component and an isocyano group-containing component at 60-100 degreesC to form a prepolymer of polyurethane; and adding to the prepolymer a diamino-chain extender such as lithium diaminosulfonate in the presence of a second solvent such as acetone to form the matrix material. The functionality ratio of isocyano groups to hydroxyl groups is 1.0-3.0. The process also involves dropping water to the matrix material formed in the above step; and removing the second solvent.Preferred Compound: The isocyano group-containing component is a compound including two or more isocyano groups or a mixture of compounds including various numbers of isocyano groups, and consists of toluene diisocyanate, methylene diphenylene diisocyanate, isophorone diisocyanate, dicyclohexane methylene diisocyanate, xylene diisocyanate, and hydrogenated xylene diisocyanate. The first solvent is water. An ionic group is provided to the prepolymer for enhancing the hydrophilicity of the resulting matrix material, and is a carboxyl or sulfonic group. A compound containing ionic group such as dimethanol propionic acid is added to the reaction system during polymerization step to provide the ionic group to the prepolymer. The ionic group is also provided to the hydroxyl group-containing component and / or the isocyano group-containing component prior to the polymerization step so as to form the prepolymer carrying the ionic group after polymerization.Preferred Electrolyte: The liquid electrolyte includes a lithium salt such as LiCF3SO3, LiClO4, LiPF6, LiBF4, LiAsF6, LiN(CF3SO2)3. The electrolyte includes a solvent such as propylene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate, diethyl ether, gamma-butyrolactone, 2-methyl-tertrahydrofuran, 1,2-dimethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone, dioxolane. EXAMPLE - 88 g of PTMG, 32 g of IPDI and 1.2 g of DMPA were mixed and reacted in a reactor under nitrogen atmosphere with stirring to form a prepolymer. Acetone and lithium diaminosulfonate was added to the prepolymer, then pure water was dropped to the system, acetone was recovered under reduced pressure and heated to form a water borne WPU dispersion solution. The dispersion solution was mixed with PEO aqueous solution and the resulting solution was dried to form a WPU-PEO composite film.