Fluorine-containing dispersion and method of manufacturing the same, and fluorine-containing composite film

A method of preparing a fluorine-containing dispersion, comprising:

• providing a first mixture, the first mixture comprising a fluorine-containing polymer powder, wherein an average particle size of the fluorine-containing polymer powder is less than or equal to 3 μm;
• and
• adding a polyimide solution in the first mixture to form a fluorine-containing dispersion, the polyimide solution comprising polyimide;
• wherein the fluorine-containing polymer powder and the polyimide form a solid content of the fluorine-containing dispersion, the fluorine-containing polymer powder has a mass ratio greater than 85% in the solid content, and the polyimide has a mass ratio less than 15% in the solid content.

A fluorine-containing composite film, comprising:

• a carrier film;
• and
• a fluorine-containing film disposed on at least one surface of the carrier film;
• wherein the fluorine-containing film comprises a fluorine-containing polymer powder and polybenzoxazole, the fluorine-containing polymer powder has a mass ratio greater than 85% in the fluorine-containing composite film, and the polybenzoxazole has a mass ratio less than 15% in the fluorine-containing composite film.