Microcomposite powder used in the manufacture of fuel cell double pole plates and supercapacitor elements comprises carbon-based electroconductive particles covered with fluoro-polymer particles

摘要

A microcomposite powder for the production of fuel cell double pole plates or supercapacitor elements comprises 1-300 micron carbon-based electroconductive particles and 0.1-0.5 micron fluoro-polymer particles. Preferred Features: The electroconductive particles are selected from graphite, carbon black aggregates, carbon fibers, carbon nanotubes and activated carbon. The fluoro polymer is a polyvinylidene fluoride (PVDF) homopolymer or copolymer containing at least 60 weight % vinylidene fluoride. The weight proportion of electroconductive particles and fluoro-polymer particles is 10-40 to 90-60. The microcomposite powder can also include up to 5 parts weight of a pore-forming agent per 100 parts of the fluoro-polymer and electroconductive particles combined. The microcomposite powder can also include a product (A) comprising a polymer or oligomer that can be dissolved in a solvent that does not dissolve the fluoro-polymer or the electroconductive material. Independent claims are given for: (a) items comprising the microcomposite powder by co-atomization of one or more emulsions or aqueous dispersions containing the different constituents; (b) fuel cell double pole plates obtained from the microcomposite powder; and (c) a process for preparing the microcomposite powder by (co)-atomization of one or many aqueous emulsions or dispersions containing the different constituents.