TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Composition: The cathode composition contains (wt.%) 5-10% Fe3O4, 60-95% Li-intercalatable heavy metal oxide (I), 6-15% polymeric binder (II), 0.9-2.5% conductive salt (III), 10-20% aprotic solvent (IV) and 0.1-10% ancillaries (V).Production: (claimed) (I) is mixed with Fe3O4, optionally with (III), (V) and/or (IV) and with (II), passed to an extruder, extruded to a cathode mass and laminated on a conductor foil.Preferred Production: The mixture of (I) with Fe3O4 and optionally (III) and (V) is milled intimately and then dispersed in (IV). The dispersion and (II) are passed to an extruder, extruded through a wide slit die and laminated on a primed aluminum (Al) conductor foil and, if necessary, (III), optionally with (IV), is added to the cathode mass before lamination to the battery composite system; or (II) is mixed intimately with a milled mixture of (I), Fe3O4, (III), (V) and (IV) and the mixture is optionally granulated before extrusion. Before producing the battery composite system, it is also possible to (a) mix (I), Fe3O4, (III), (II) and 50% of (IV), laminate as foil onto a primed Al conductor by extrusion, dry the foil and then impregnate it with (IV); or (b) produce the foil without (III), dry the foil and then impregnate it with (III) and (IV). Alternatively, a mixture of (I), Fe3O4, (III), (II) and optionally (V) is mixed intensively with N-methylpyrrolidone and the dispersion is applied to a conductor foil in defined thickness, preferably 24-30 microns; or (I) is milled with Fe3O4 and (V), treated with aqueous (II) dispersion, applied to primed Al foil and dried and the 15-30 microns thick cathode mass is impregnated with (III) and (IV). All stages are carried out under protective gas, preferably argon; and all the materials used are degassed at 20-250degreesC and 760 to 10-4 torr.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The Fe3O4 has a particle size of 0.5-30 microns. (I) is selected from oxides of manganese (Mn), nickel (Ni), cobalt (Co), vanadium (V), chromium (Cr), molybdenum (Mo) and/or titanium (Ti).Preferred (III) include lithium (Li) perchlorate LiClO4, Li tetrafluoroborate LiBF4 and Li hexafluorophosphate LiPF6; and preferred (V) include magnesium oxide MgO, alumina Al2O3 and silica SiO2.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: Preferred (III) include Li organylborates, Li triflates, Li trifluoromethylsulfonyl imides and their derivatives; and preferred (V) include Li acetylacetonate.Preferred (IV) are N-methylpyrrolidone, alkyl carbonates, glycol ethers, polyfluoroethers and/or mono- and/or dimethacrylates with 2-20 C perfluoroalkyl groups, especially octafluoropentyl methacrylate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Binders: (II) is selected from polyolefins, polyisobutene, polystyrene, polybutadiene, polyisoprene, copolymers of styrene with butadiene and/or isoprene as random copolymers or as block polymers produced by anionic polymerization, polyvinyl pyrrolidone, polyvinyl ethers, polyethers with blocked end groups and/or fluoro-elastomers, including their copolymers. The fluoro-elastomers are selected from copolymers, such that the fraction of fluoro-elastomer copolymers in the polymer mixture is 10-90% and terpolymers, especially of tetrafluoroethylene, hexafluoropropene, fluoroalkoxy-monomers and/or vinylidene fluoride. The binder preferably is a crosslinkable polybutadiene oil, especially of molecular weight 10000-30000. EXAMPLE - 65 wt.% lithium-cobalt oxide, 6.5 wt.% iron(II,III) oxide Fe3O4, 1.5 wt.% lithium oxalatoborate were ball milled under argon for 100 minutes at room temperature, then degassed 60 minutes at 100degreesC and 10-2 torr). Under protective gas, the mixture was treated with 1 wt.% magnesium oxide and 8.5 wt.% ethylene carbonate and milled for 60 minutes at 30-50degreesC. After adding 9 wt.% Dyneon THV 200 (RTM; fluoro-elastomer terpolymer) and 7.5 wt.% propylene carbonate, the mixture was mixed intensively for 60 minutes at 80-100degreesC in a mixer at about 40-50 rpm, granulated at room temperature and degassed (60 minutes at room temperature and 10-2 torr). To produce cathode (A), the granulate was extruded at 110-120degreesC and laminated onto aluminum foil, primed with 30 wt.% conductive carbon black and Dyneon THV D (RTM), at 50-65degreesC, giving a 28-30 microns film. The cathode was provided with a separator Cellgard (RTM), impregnated with 0.5 M lithium oxalatoborate solution in dimethyl carbonate, and an anode, wound, provided with contacts and enclosed in shrink-wrap film. To produce control cathode (B), conductive carbon black was used instead of Fe3O4 and the process was carried out under protective gas but without degassing. Production was much more difficult, as the material was dry and difficult to process, whilst extrusion fluctuated, making uniform coating difficult. The discharge capacity was (A) 35 (B) 26 Ah; and fading (A) under 2.5% after 150 cycles, (B) over 2.5% after 20 cycles.