TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (claimed): Preparation of the amorphous oxide-based compound (I) including a sol-gel method involves producing a mixture by dissolving in a solvent, a first precursor solute comprising a compound consisting of at least one of the alkali-metal family of the Periodic Table, a second precursor solute comprising a compound of at least one of lanthanum, barium, strontium, calcium, indium, magnesium, yttrium, scandium, chromium, aluminum, lutetium, potassium, the alkali-metal family of the Periodic Table and the lanthanide series of the Periodic Table, a third precursor solute comprising a compound of at least one of zirconium, tantalum, niobium, antimony, tin, hafnium, bismuth, tungsten, silicon, selenium, gallium and germanium, and a fourth precursor solute comprising a compound of at least one of oxygen, sulfur, selenium, and the halogen family of the Periodic Table of Elements; and dispensing the mixture in a planar configuration, transitioning through a gel phase, and drying and curing to a dry phase. Preferred Method: In the method (M1), the mixture is dispensed into a planar configuration by one of spin coating, casting, dip coating, spray coating, screen printing and ink-jet printing. The lanthanum methoxyethoxide comprises lanthanum methoxyethoxide (4.5 g) pre-dissolved in the alcohol-based solvent to produce a lanthanum methoxyethoxide solution comprising the lanthanum methoxyethoxide (12 wt.%). The zirconium butoxide comprises zirconium butoxide (0.77 g) pre-dissolved in an amount of butanol to produce a zirconium butoxide solution comprising the zirconium butoxide (80 wt.%). The polymer solution comprises polyvinyl pyrrolidone (1 g to not greater than 2 g) dissolved in methoxyethanol (5 g), and the alcohol-based solvent comprises methoxyethanol (5 g). Preferred Compound: The amorphous oxide-based compound (I) has a planar configuration for an electrolyte medium. The amorphous lithium lanthanum zirconium oxide comprises lithium (0.1-50%), lanthanum (0.1-25%), zirconium (0.1-25%), oxygen (30-70%) and carbon (0.0-25%). Preferred Components: The first precursor solute comprises lithium alkoxide, the second precursor solute comprises lanthanum alkoxide, and the third precursor solute comprises zirconium alkoxide. The lithium alkoxide comprises lithium butoxide, the lanthanum alkoxide comprises lanthanum methoxyethoxide, and the zirconium alkoxide comprises zirconium butoxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solvent comprises an alcohol-based solvent. The alcohol-based solvent comprises methoxyethanol and the polymer comprises polyvinyl pyrrolidone.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymer comprises an amount of the polymer pre-dissolved in an amount of the alcohol-based solvent to produce a polymer solution. Preferred Definitions:    M1=lithium;    M2=lanthanum;    M3=zirconium;    M4=oxygen.    The percentage of total number of atoms M1 comprises 0.1-50%. The percentage of total number of atoms M2 comprises 0.1-25%. The percentage of total number of atoms M3 comprises 0.1-25%. The percentage of total number of atoms M4 comprises 30-70% The percentage of total number of atoms carbon comprises 0.0-25%.    EXAMPLE - No suitable example given.