TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Particles: The organically modified oxide particles are free of organic groups capable of ionically interacting with the alkali metal salt. The organic groups comprise hydrogen atoms capable of forming hydrogen bonds.Preferred Salt: The alkali-metal salt comprises lithium salt, preferably lithium hexafluorophosphate, lithium trifluoromethane sulfonate, lithium bis(trilfuoromethylsulfonyl)imide, or their combinations.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Groups: The organic groups are alkyl, alkene, alkyne, aryl, aldehyde, ketone, ester, tertiary amide, ether, or their halogenated derivatives, siloxanes, or their combinations.Preferred Composition: The electrolyte comprises at least 1 vol.% organically modified oxide particles. It further comprises dialkyl carbonate, cyclic carbonate (preferably ethylene carbonate), poly(ether), or their combinations. The electrolyte is a pressure sensitive adhesive. The electrolyte, when incorporated into a cell, is functional over a period of at least 16, preferably at least 25, more preferably at least 50 charge-discharge cycles, where each half cycle consists of 1 mAh/cm2 lithium being transferred through the electrolyte at a cycling rate of 0.5 mA/cm2.    TECHNOLOGY FOCUS - POLYMERS - Preferred Materials: The solid polymer comprises a polyalkylene oxide, preferably polyethylene having a molecular weight greater than 100000. It comprises a copolymer comprising the reaction product of monomers, preferably propylene oxide, ethylene oxide, ally glycidyl ether, or their combinations. SPECIFIC MATERIALS - The oxide particles are alumina, titania, zirconia, or their combinations, preferably silica.    EXAMPLE - One part by weight Aerosil R805 octyl modified silica was combined with 10 parts by weight of 4:1 acetonitrile:toluene in a 1000 ml polyethylene jar. The jar was filled halfway with ceramic milling beads 1 cm in diameter, capped, and tightly sealed. The suspension was coated in thin layer onto a polypropylene film backing, and then dried at 80 degreesC to form a solid polymer electrolyte film. After drying, the resulting film was passed through a chamber to expose the dry coat to an ultraviolet light source to crosslink the polymer. A circular electrolyte measuring 1 inch in diameter was die cut from this film, peeled from the backing and placed between two circular die cut pieces of lithium foil having a nickel backing and measuring 1 inch in diameter. The structure was heat sealed between two brass shims using hot melt adhesives.