TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The organic groups include alkyl, alkene, alkyne, aryl, aldehyde, ketone, ester, tertiary amide, ether, their halogenated derivatives, siloxanes, or their combinations.Preferred Composition: The electrolyte composition further includes a compound including dialkyl carbonate, cyclic carbonate, (poly)ether, or their combinations. The cyclic carbonate is preferably ethylene carbonate.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The organically modified oxide particles are free of organic groups capable of ionically interacting with the alkali metal salt, or of organic groups comprising hydrogen atoms capable of forming hydrogen bonds. The electrolyte comprises 1 vol.% organically modified oxide particles. The oxide particles include alumina, titania, zirconia, their combinations, or silica. The alkali-metal salt comprises a lithium salt, preferably lithium hexafluorophosphate, lithium trifluoromethane sulfone, lithium bis(trifluoromethylsulfonyl)imide, or their combinations.    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Electrolyte: The electrolyte incorporated into a cell having a voltage variation of not more than+/-3 mV over 5 charge-discharge cycles, where each half cycle consists of 1 mAh/cm2 lithium transferred through the electrolyte at a cycling rate of 0.5 mA/cm2 at 80 degreesC. It is functional over a period of at least 16 charge-discharge cycles preferably 50 cycles.    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymer: The solid polymer is a polyalkylene oxide preferably polyethylene oxide having a molecular weight greater than 100,000. It may comprise a copolymer of the reaction product of monomers including propylene oxide, ethylene oxide, allyl glycidyl ether, or their combinations. EXAMPLE - 1 part by wt. (pbw) surface modified hydrophobic fumed silica bearing perfluoroalkyl surface groups and 4 pbw solids(polymer/salt/Irgacure) of a polymer solution were combined in a 500 ml poly(ethylene) jar. The jar was filled halfway with ceramic milling beads 1 cm in diameter, capped, tightly sealed, and rolled for 5 days to form a suspension which was coated in a thin layer (14 mum after drying) onto a polypropylene film backing and dried at 80 degreesC to form a solid polymer electrolyte film. The resulting film was exposed to ultraviolet light to crosslink the polymer. The film was used in an electrochemical cell. The cell was tested at 80 degreesC. Lithium was stripped and plated on the electrode by changing the polarity of the cycle over time increments that gradually increased but did not exceed 2 h. The cells were cycled with a current density 0.5 mA/cm2. The cell voltage was at steady state.