TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Method: In the method (M1), the filler is provided in the form of a solution to facilitate infusion of the filler into the voids and controllably removing the solvent. The solvent is removed by evaporation. The method (M2) is also a method of transportation. Preferred Material: The material (C1) further comprises at least one component selected from an electroactive carbon, a conductive carbon and an electroactive component other than the composite particle (P1); and is an electrode composition. Preferred Electrode: The electrode is an anode.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The electroactive material is selected from silicon, germanium, gallium, lead, aluminum, tin, Se, Te, B, P, binary metal oxides, BC, BSi, Si-C, SiGe, SiSn, GeSn, WC, SiOx, Lithium titanium oxides, TiO2, BN, Bas, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, BeSe, BeTe, GeS, GeSe, GeTe, SnS, SnSe, SnTe, PbO, PbSe, PbTe, AgF, AgCl, Agbr, AgI, BeSiN2, ZnGeP2, CdSnAs2, ZnSnSb2, CuGeP3, CuSi2P3, Si3N4, Ge3N4, Al2O3, Al2CO or their oxides, nitrides, hydrides, fluorides and/or their alloys. The electroactive element is selected from silicon, germanium, gallium, tin, lead, aluminum, oxides, nitrides, hydrides, fluorides, and/or alloys. The electroactive material is silicon, silicon alloy or electroactive silicon compound.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: In the composition (C3), the filler includes a surfactant to maintain the composite particles in a stable suspension. Preferred Components: The filler is soluble in an electrolyte solution having a salt concentration of at least 0.7 M, preferably 0.7-2 M; and is soluble in a solution selected from N-methylpyrrolidone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma butyro lactone, 1,2-dimethoxy ethane, 2-methyl tetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, acetonitrile, nitromethane, methylformate, methyl acetate, phosphoric acid trimester, trimethoxy methane, sulfolane, methyl sulfolane and 1,3-dimethyl-2-imidazolidione. The filler sublimes or degrades at 70-200 degrees C, preferably 70-110 degrees C. The temporary filler is selected from ortho- and para-cresol, 3-nonanol, 1-methyl cyclohexanol, para-toluenenitrile, 2-methoxyphenol, 2-phenol-2-propanol, 2,3-dimethylanisole, phenol, 2,4-diemthylphenol, 3,4,4- trimethylpentanol, butanediol, oxalic acid, a surfactant and a natural wax or a synthetic wax selected from 12-hydroxystearic acid, low molecular weight polyethylene, petroleum waxes such as paraffin wax, and microcrystalline waxes. The first particle component is a pillared particle. The surface portion comprises at least one pillar distributed over a body portion. The voids of the surface portion comprise channels extending from the body portion to the particle boundary. The first particle component is a porous particle having voids distributed through there. The porous particle is a fiber, wire, thread, tube, flake or ribbon with a minor dimension of at least 10 nm. The voids are distributed at the surface of the particle. The first particle component is a porous particle fragment or a fractal; and is a scaffold structure. The particle has a principal diameter of 0.5-10 mu m. The body portion and the surface portion are formed integrally and the active material comprising the body portion is the same as or is similar to the active material of the surface portion. The active material of the body portion is different to the active material of the surface portion. The active material is an electroactive material. The body portion includes at least one void extending through there. EXAMPLE - No suitable example given.