Abstract: A method to produce a composite semi-finished product, having a continuous phase including at least one thermoplastic plastic and a dispersed phase made from at least one electrically conductive filler. The at least one thermoplastic plastic in form of fine particles is mixed with the at least one filler in the form of fine particles. In each case, at least 90% by weight of the particles of the at least one thermoplastic plastic and of the at least one filler are smaller than 1 mm. The mixture of the at least one thermoplastic plastic and the at least one filler is heated to a temperature greater than the melting temperature of the at least one thermoplastic plastic. The heated material is cooled to a temperature below the solidification temperature of the at least one thermoplastic plastic.

Abstract: The invention relates to a method for hydrophilicizing a semi-finished element, in particular an electrode element, a bipolar element and/or a heat exchanger element, made of a plastic material or plastic composite material containing at least one thermoplastic and/or at least one thermosetting plastic. In order that the wettability of the component surface for aqueous media can be increased with smaller structure changes, with lower costs and with less effort, provision is made for the hydrophilicizing to be caused at least partially by applying carbon particles at least in sections on at least one surface of the semi-finished element and the carbon particles to be applied by rubbing, pressurised gas jet and/or by electrostatics at least in sections on the at least one surface in such manner that the carbon particles remain adhered to the surface.

Abstract: Provided herein is a cell of a redox flow battery, having at least one cell frame element, a membrane and two electrodes. The at least one cell frame element, the membrane and the two electrodes surround two cell inner spaces which are separate from each other. In the at least one cell frame element, at least four separate channels are provided in such a manner that different electrolyte solutions can flow through the two cell inner spaces. With the exception of the at least four separate channels, the cell is constructed in a fluid-tight manner. At least the at least one cell frame element is welded to the membrane, the two electrodes, and/or at least one additional cell frame element to provide the redox flow battery with a higher power of density.

Abstract: A method to produce a composite semi-finished product, having a continuous phase including at least one thermoplastic plastic and a dispersed phase made from at least one electrically conductive filler. The at least one thermoplastic plastic in form of fine particles is mixed with the at least one filler in the form of fine particles. In each case, at least 90% by weight of the particles of the at least one thermoplastic plastic and of the at least one filler are smaller than 1 mm. The mixture of the at least one thermoplastic plastic and the at least one filler is heated to a temperature greater than the melting temperature of the at least one thermoplastic plastic. The heated material is cooled to a temperature below the solidification temperature of the at least one thermoplastic plastic.