Process for the solvent-free coating of foils for electrochemical applications
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsJannes Marten Ophey, Andreas Würsig
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Abstract
The present invention provides a solvent-free process for producing foil with a functional coating containing an active material and a meltable polymer, the foil with a functional coating and its use as an electrode foil, electrolyte in solid-state batteries or separator for electrochemical storage. The process comprises scattering a dry powder mixture onto a foil, melting the dry powder mixture, and calendering the foil covered with the molten powder.
Claims12
A process of producing a foil with a functional coating containing an active material and a meltable polymer, wherein the foil having a functional coating is for use as an electrode foil, an electrolyte in solid-state batteries, or a separator for electrochemical storage, the process comprising the steps of:
- (a) providing a dry powder mixture comprising (i) particles of an active material and (ii) particles of a meltable polymer,
- (b) scattering the dry powder mixture on a foil to form a powder-covered foil,
- (c) melting the powder of the powder-covered foil to form a foil covered with molten powder,
- (d) calendering the foil covered with molten powder to form a calendered structure;
- and
- (e) cooling the calendered structure to form the foil with a functional coating,
- wherein step (b) is carried out by applying the dry powder mixture to a scattering roller, scraping the dry powder mixture off the scattering roller by means of an oscillating brush, and dropping the dry powder mixture onto the foil through at least one oscillating distribution disc.
Dependencies are inferred from the claim text.