The invention relates to the
new energy field of
metal fuel batteries, in particular to a waterproof breathable film of a
magnesium metal air battery and a continuous
coating preparation method of the waterproof breathable film. The waterproof breathable film of the
magnesium metal air battery comprises waterproof breathable film
slurry and a
carrier material, wherein the waterproof breathable film
slurry is composed of, by
mass, 20-50% of a waterproof breathable material and 50-80% of
solvent water, and the waterproof breathable material is composed of, by
mass, 30-90% of a carbon-based material and 10-30% of a binder The preparation method comprises the following steps: conducting stirring and pulping to obtain the waterproof breathable film
slurry with specific
viscosity,
coating the
carrier material with the waterproof breathable film slurry through a continuous
coating method, and successively conducting
drying, vacuum heat treatment and rolling to obtain the waterproof breathable film of the
magnesium metal air battery. According to the invention, the air permeability, waterproofness and
conductivity of the waterproof breathable film can be effectively regulated and controlled, the use requirement of the metal-air battery is met, a production process is simplified, production efficiency is improved, and the method is suitable for industrial large-scale production.