TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Electrolyte: The solid electrolyte undergoes a heating process at greater than or equal to 40 (preferably greater than or equal to 100)degreesC under a situation that the solution or the hybrid compound after neutralization contains at least one species of phosphoric acid and boric acid.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The inorganic compound contains at least one species of silicic acid, tungstic acid, molybdic acid, stannic acid, or zirconic acid. The inorganic compound salt is at least one species of metal salt of silicic acid, tungstic acid, molybdic acid or stannic acid; or zirconium halide and/or oxyzirconium halide. The zirconium halide or oxyzirconium halide is zirconium chloride or zirconium oxychloride. The hybrid compounds contains at least one species of phosphorus, boron, aluminum, titanium, calcium, strontium or barium compounds. Preferred Process: The hydrogen bond and/or at least one species of phosphoric acid ester and boric acid ester are formed as combining form. The raw material solution before neutralization contains at least either one species selected from metal salt of phosphoric acid and boric acid or at least one species of aluminum salt, titanium salt, calcium salt, strontium salt or barium salt; and boric acid. The hybrid compound is either immersed in a liquid containing at least one species of phosphoric acid and boric acid, or coated with the liquid that is heated at greater than or equal to 60degreesC. Part of the hydroxyl groups of organic polymers with hydroxyl group are combined with sulfuric acid; and the hydrogen bond, the sulfuric acid ester and/or the sulfonic group are formed as combining form. The part of the hydroxyl groups of organic polymer with hydroxyl group are combined with either sulfuric acid by immersing in the liquid containing sulfuric acid; coating with the liquid, or exposing to the steam containing sulfuric acid with being heated at greater than or equal to 60degreesC; or an aldehyde by an acetalization reaction or immersing in the solution containing aldehyde and acid, coating with the solution, or exposing to the steam containing aldehyde and acid.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The inorganic compound contains at least one species of silicic acid, tungstic acid, molybdic acid, stannic acid, or zirconic acid. The inorganic compound salt is at least one species of metal salt of silicic acid, tungstic acid, molybdic acid or stannic acid; or zirconium halide and/or oxyzirconium halide. The zirconium halide or oxyzirconium halide is zirconium chloride or zirconium oxychloride. The hybrid compounds contains at least one species of phosphorus, boron, aluminum, titanium, calcium, strontium or barium compounds. Preferred Process: The hydrogen bond and/or at least one species of phosphoric acid ester and boric acid ester are formed as combining form. The raw material solution before neutralization contains at least either one species selected from metal salt of phosphoric acid and boric acid or at least one species of aluminum salt, titanium salt, calcium salt, strontium salt or barium salt; and boric acid. The hybrid compound is either immersed in a liquid containing at least one species of phosphoric acid and boric acid, or coated with the liquid that is heated at greater than or equal to 60degreesC. Part of the hydroxyl groups of organic polymers with hydroxyl group are combined with sulfuric acid; and the hydrogen bond, the sulfuric acid ester and/or the sulfonic group are formed as combining form. The part of the hydroxyl groups of organic polymer with hydroxyl group are combined with either sulfuric acid by immersing in the liquid containing sulfuric acid; coating with the liquid, or exposing to the steam containing sulfuric acid with being heated at greater than or equal to 60degreesC; or an aldehyde by an acetalization reaction or immersing in the solution containing aldehyde and acid, coating with the solution, or exposing to the steam containing aldehyde and acid.    TECHNOLOGY FOCUS - POLYMERS - The organic polymer with hydroxyl group is polyvinyl alcohol. EXAMPLE - An aqueous solution comprising (wt.%): sodium tungstate dehydrate (7.5) and trisodium phosphate (3) and an aqueous solution of sodium silicate (3 wt.%) were added into 100 cc aqueous solution of polyvinyl alcohol (10 wt.%) at 3100 - 3900 average degree of polymerization and 86 - 90% in degree of saponification to form a raw material aqueous solution. This aqueous solution was agitated and hydrochloric acid (2.4 M) was dropped to neutralize and prepare the viscous precursor aqueous solution. This precursor aqueous solution was put in an airtight container; evacuated for defoaming; and kept at 40degreesC for one hour and 15 hours at normal temperature so that the compounding process could be promoted. A polyester film was put on the flat and smooth pedestal of the coating equipment equipped with the blade that allowed the adjustment of the gap with the pedestal. The defoamed precursor aqueous solution was cast over it. At this time, the pedestal was heated at 50degreesC under control. As soon as casting the precursor aqueous solution over the pedestal, the blade with the gap adjusted at 0.6 mm was swept over the precursor aqueous solution with a constant speed to smooth it into a constant thickness. It was heated at 50degreesC to vaporize water from its. After fluidity was nearly cost, the precursor aqueous solution was cast again over it, and the blade was swept again over the precursor solution to make it into a constant thickness. After this operation was repeated 3 times, the temperature of pedestal was raised to 105 - 100degreesC. Additionally it was heated with this condition kept form 2 hours. Subsequently, a solid electrolyte membrane was formed on the pedestal. The membrane was peeled and dried after it was rinsed in water.