Abstract: An electromagnetic device for converting energy comprises: a ferromagnetic core of essentially planar shape and delimited by a peripheral contour; a primary winding and a secondary winding formed by primary turns and secondary turns, respectively. The device includes, arranged against the peripheral contour, a first block and a second block and a ferromagnetic material, and has a magnetic permeability lower than that of the ferromagnetic core. At least one primary turn and/or at least one secondary turn is formed around or passing through the first block and/or the second block to form, respectively, a first leakage inductance and/or a second leakage inductance.

Abstract: A composite electrode material is based on graphitic carbon and includes a ground product, dispersed within the graphitic carbon, of an intimate mixture of carbon fibers and silicon. The composite electrode material can be included in an electrode for electrical energy storage batteries along with one or more binders. The electrode is prepared by mechanically grinding carbon fibers and silicon particles in the presence of a solvent, drying the mixture until the solvent has disappeared completely, adding the dried ground product to the particles of graphitic carbon, mixing the whole in the presence of at least one binder, spreading the mixture on a current collector, and then drying.