TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Process: The process comprises: (a) modifying MA particles using at least one reagent T1-X1-L1 and a reactants T1'-X1'-Q1; (b) modifying CE particles using at least one reactants T2-X2-L2 and a reactants T2' X2'-Q2; (c) modifying current collector using reagents T3-X3-L3 and T3'-X3'-Q3; (d) mixing modified MA particles and modified CE particles and contacting with the modified current collector; (e) applying conditions for the reaction between the various groups L, provided that the L1, L2 and L3 are chosen so that they can react together. The step (e) is carried out in one or more steps, before or after contacting the mixture of modified MA particles and modified CE particles with current collector. The process comprises introducing the current collector modified according to step (c) in a liquid medium, MA particles modified according to step (a), the EC particles modified according to step (b), then applying the conditions required for the reaction between different groups L1, L2 and L3. The process comprises: preparing a mixture of modified MA particles and modified EC particles, preparing a modified current collector, depositing the mixture of modified particles on the modified current collector, then applying, as in the first operative mode, the conditions required for the reaction between different groups L1, L2 and L3; and preparing a modified current collector carrying the L3 groups, preparing modified particles MA carrying a L1 group, preparing modified particles CE carrying groups L2 and L2' capable of reacting with each other and one of which may react with L1; mixing the modified particles and applying the conditions required for the reaction between the different groups L1, L2 and L2'; depositing the material resulting from the reaction between different groups L1, L2 and L2' on the modified current collector and applying the conditions for the reaction of L3 groups with the L1, L2 and L2' groups remained free.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The active material is oxides, phosphates or borates. The CE material is a carbon black, graphite, carbon nanotube and/or carbon fiber. The CC is a metallic material comprising stainless steel, aluminum, copper or nickel, where the metallic material is optionally modified by a layer of carbon, transition metal nitride or conductive polymer. The particles of MA, CE and CC (generally referred by substrates) are modified using reactants (T-X-L) which allow the formation of a covalent bond between the particles and other part of particles and the current collector, and using other reactants (T-X-Q), which control the charge, where: the group T is a functional group capable of reacting with one of elements MA, CE and CC to form a covalent bond; the group X is a conjugated spacer group, i.e. a group that comprises a system of atoms linked by a covalent bond with at least one delocalized bond; the group L is a functional group capable of reacting with another functional group L to form a covalent bond; and the group Q is a charged group that can be optionally formed in situ. The group T is: dihydrogen phosphate (PO3H2), carboxylic acid (COOH) or sulfonic acid (SO3H) group and the substrate to be modified is oxide, phosphate or borate; and diazonium cation, where the substrate to be modified is made of carbon to form the CE or MA material in the form of particles and is partially coated with carbon or a metallic material. The Q group bears a negative charge or positive charge. The group Q is a negative charge group, preferably carboxylate anion (COO-), phosphate anion (HPO3-), oxy phosphorus anion (PO32-) or sulfur trioxide anion (SO3-) and the positive charge group is ammonium (NH3+).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The spacer X is a divalent group comprising at least one group comprising phenylene groups, oligophenylene, oligophenylenevinylene, ethynylene, oligothiophene and azo benzene. The reactant comprises an azido group or amine group and other reactant comprises an acetylene group or COOH group. The reactant is (4-amino-phenyl)-phosphonic acid, (4-amino-phenyl)-acetic acid, 4-(1-(4-amino-phenyl)-1H-(1,2,3)triazol-4-yl)-benzoic acid, 4-azido-benzoic acid, 4-azido-phenylamine, 4-ethynyl-phenylamine or benzene-1,4-diamine.