TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: Each electrode component is a dry material that contains no solvent. The electrode components comprise active material (greater than 50, preferably 60-68 wt.%), electrically-conductive material (1-10 wt.%), ionically-conductive polymer (10-40 wt.%), lithium salt (3-15 wt.%), and solvent (less than 0.5 wt.%). Preferred Components: The active material comprises metal oxide, e.g. oxides of vanadium, manganese, cobalt, nickel, chromium, aluminum, tungsten, molybdenum, titanium, and/or lithiated versions of these oxide, or preferably vanadium oxide. The particle size of the active material is not reduced during processing. The electrically-conductive material comprises carbon black and/or graphite.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The ionically-conductive polymer comprises a derivative of oxygen-containing or nitrogen-containing monomer, preferably polyalkylene oxide polymer or copolymer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The electrolyte salt is fluorinated lithium salt, e.g. lithium hexafluoroarsenate, lithium perchlorate, lithium hexafluorophosphate, lithium trifluoroborate, lithium trifluoromethanesulfonate, lithium bis(trifluoromethanesulfonyl)imide, lithium bis(perfluoroethanesulfonyl)imide, and/or lithium tris(trifluoromethanesulfonyl)methide.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Apparatus: The extruder is a co-rotating, fully intermeshing twin-screw extruder comprising feed inlets and a downstream extruding end.    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Method: The ionic salt is fed into the extruder at a first feed position (4). Each of the ionically-conductive polymer, active material, and electrically-conductive material is fed into the extruder at feed positions downstream from the ionic salt feed position. The ionically-conductive polymer is fed into the extruder as a solid containing no solvent or as a melt. The ionically-conductive polymer is fed into the extruder at a second position (6) downstream from the first feed position, and a mixture of active material and electrically-conductive material is fed at a third feed position (12) downstream from the second feed position; or a mixture comprising active material, electrically-conductive material, and ionically-conductive polymer is fed at a second feed position, and a mixture comprising active material and electrically-conductive material is fed at a third feed position downstream from the second feed position. The ionically-conductive polymer, active material, and electrically-conductive material may be combined and fed into the extruder as a single mixture at a second feed position.