Process for coating a carrier material with an active material for the production of an electrode foil of a battery cell

A process for coating a carrier material with an active material for production of an electrode foil of a battery cell with a Laval nozzle, wherein the Laval nozzle has at least one converging first portion, one second portion having a smallest flow cross section, and one diverging third portion, the first, second and third portions being arranged one after the other along a flow direction;

• the process comprising at least the following steps:
• a) introducing a first gas stream via the first portion into the Laval nozzle;
• b) introducing a first particle stream, at least comprising a binding material for the active material, via the third portion into the Laval nozzle;
• c) introducing the active material as a second particle stream via the first portion into the Laval nozzle;
• d) mixing the first gas stream and the first particle stream and accelerating the first particle stream by means of the first gas stream flowing at a supersonic speed in the third portion;
• and
• e) subjecting the carrier material to the first particle stream and the second particle stream to form a layer of a coating;
• wherein the first particle stream comprises only the binder material, and wherein the second particle stream comprises only the active material, such that the binder material and the active material are introduced at different portions of the Laval nozzle.