TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: (I) comprises: at least one electronic conductive additive and/or at least one binder; and a surface treatment agent (up to 2 wt.%). (I) comprises at least one submicron-sized compound (II) and at least one micron-sized compound (II). Preferred Process: The milling step is performed in the presence of a solvent comprising at least 50 vol.% of water or N-methylpyrrolidone. In the process: before the milling step, (II) has a particle size distribution (D90) of greater than or equal to 50 mu m, preferably greater than or equal to 150 mu m; after the milling step, (II) has a particle size distribution (D90) of greater than or equal to 30 mu m; after the milling step, (II) is composed of individual particles and/or agglomerates of individual particles; and after the milling step, (II) is composed of secondary particles with D50 of 0.5-10 mu m. Preferred Components: (II) in the form of strong agglomerates is obtained by a process comprising a dry high-energy ball milling of precursors. The electronic conductive additive is carbon black, graphite, carbon fiber, carbon nanotube, carbon nanofiber, graphene, vapor growth carbon fiber or metallic oxide. The surface treatment agent is titanium, zirconium or silicon alkoxides. The size of individual particles is 10 nm to 3 mu m. The size of agglomerates is 100 nm to 3 mu m. (II) is obtained by a process comprising a thermal treatment of precursors, where: the precursors comprise iron-phosphate (FePO4), lithium carbonate (Li2CO3) or a carbon source; or the precursors comprise iron phosphate (Fe2P2O7), optionally having a carbon deposit, Li2CO3 and a carbon source.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The binder is polymers comprising repeating unit of hexafluoropropylene and/or vinylidene fluoride. The binder is polymers comprising ethylene oxide repeating units. EXAMPLE - Iron phosphate dihydrate (834.91 g), lithium carbonate (165.09 g), stearic acid (25 g) and micronized polyethylene wax powders (25 g) were charged in an high-energy ball milling vertical agitation attritor containing yttrium-stabilized zirconium dioxide beads (10 kg, having 10 mm diameter) as milling media. The attritor was then operated during 2 hours at a speed of 350 rpm, corresponding to a 2 kilowatt-hour (kWh) grinding power by kilogram of material being grinded (2 kWh/kg), based on running power of electric motors rotating agitating arms. Strong agglomerates of precursors were obtained after attrition. An experiment has been repeated to produce a 25 kg master batch with similar results. The agglomerates were introduced in a rotary kiln at a feed rate of 10 kg/hour and the temperature was gradually raised up to 700 degrees C at the rate of 6 degrees C per minute. The temperature was maintained for one hour at 700 degrees C and then the product was cooled over 40 minutes and then discharged in an airtight container under nitrogen. The kiln was continuously flushed with nitrogen throughout the duration of the thermal treatment. Humid nitrogen gas (bubbled in water at 35-40 degrees C) was injected in the rotary kiln in the middle of the zone corresponding to 700 degrees C 1 hour heat treatment step to give carbon deposited lithium iron phosphate (C-LiFePO4) agglomerates. A fraction of the C-LiFePO4 agglomerates obtained was subjected, in a jar mill with zirconia beads, to ball milling in N-methylpyrrolidone during 12 hours.