TECHNOLOGY FOCUS - POLYMERS - Preferred Ionic Conductor: The cellulosic reinforcement comprises cellulose microcrystals or microfibrils and is present in an amount of 1-10 wt.%. The acid-functional polymer has alkylsulfonic, arylsulfonic, perfluorosulfonic or perfluorocarboxylic groups. Polymer (II) has polar groups and comprises units containing heteroatoms (sulfur, nitrogen, oxygen, phosphorus, boron, chlorine or fluorine).Preferred Electrolytes: The polymer matrix of the electrolyte for a lithium-polymer battery with a lithium metal cathode is an amorphous one-dimensional copolymer or an amorphous three-dimensional polyether. The polymer matrix of the electrolyte for a lithium-polymer battery with a lithium-containing graphite cathode is a (co)polymer of vinylidene fluoride, (meth)acrylonitrile, alkyl (meth)acrylate or ethylene oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Materials: The aprotic polar liquid is an ether, acetal, carbonate, ester, nitrile, nitro compound, amide, sulfone, sulfolane, alkylsulfamide or partially halogenated hydrocarbon. The acid is selected from perchloric acid, phosphoric acid, perfluorosulfonic acids, compounds referred to as trifluorosulfonylimide acid and tris(perfluorosulfonyl)methane acid, perfluorocarboxylic acids, perfluorosulfonimides and arylsulfonimides, and the salt is an alkali metal, alkaline earth metal, transition metal, rare earth metal, organic cation or organometallic cation salt of such an acid.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Electrodes: The electronic conductor material comprises carbon black or carbon fabric and/or an electronically conductive or ionically and electronically conductive polymer. The insertion material is selected from cobalt, nickel, manganese, vanadium and titanium oxides, iron phosphate and graphite. The catalytically active material is platinum or a platinum alloy. EXAMPLE - Ionically conductive film was produced mixing a 5% aqueous polyethylene oxide solution with a 0.5% aqueous suspension of cellulose whiskers, pouring the mixture into a PTFE mold, heating the mold at 40 degrees C for 48 hours, detaching the film and drying it in vacuo at 100 degrees C for 24 hours. The film contained 8 vol.% cellulose whiskers.