Method for producing a coating material for coating electrode carriers and coating material in granule form

A method for coating an electrode carrier of an electric energy storage system, comprising the steps of:

• a) preparing a coating material and heating the coating material to a specified coating temperature,
• b) coating the electrode carrier with the coating material,
• c) drying the coated electrode carrier,
• wherein
• preparing the coating material comprises:
• a1) providing a dry mixture, containing at least i) active material, ii) a conductivity additive as well as iii) a fluorine-containing polymer binder, the fluorine-containing polymer binder being selected from a group comprising polyvinylidene fluoride (PVDF), a polyvinylidene fluoride copolymer (PVDF-Copolymer), or any mixture of PVDF and/or at least one PVDF copolymer or any mixture of PVDF and/or at least one PVDF copolymer,
• a2) bringing the dry mixture into contact with a solvent mixture, containing at least 60% by weight ethylene carbonate and/or propylene carbonate or 60% by weight of any mixture thereof, the fluorine-containing polymer binder and the solvent mixture being present in a ratio of 1:(5-30),
• a3) thoroughly mixing the solvent mixture and the dry mixture at a temperature of more than 80° C. until the fluorine-containing polymer binder has dissolved completely in the solvent mixture,
• a4) the mixture, obtained after the complete dissolution of the fluorine-containing polymer binder, is cooled to a temperature below 40° C., the mixture obtained curing during the cooling process and
• a5) the mixture obtained being granulated during or after the curing process.