| abstract |
The invention relates to the technical field of diaphragms for lithium ion batteries, in particular to a high-adhesion polymer coating diaphragm and a preparation method thereof. The high-adhesion polymer coating diaphragm is characterized in that high-adhesion polymer slurry is coated on the surface of a base film, and the high-adhesion polymer slurry comprises high-adhesion polymer dispersion liquid, water-based high-molecular glue, a suspension stabilizer, an auxiliary agent and a slurry solvent; the high-adhesion polymer dispersion liquid comprises an emulsifier, a solvent and high-adhesion polymer particles with a core-shell structure, wherein the particles have the core-shell structure with soft inner parts (core layer soft monomers) and hard outer parts (shell layer hard monomers), so that the polymer particles are easy to disperse, and the high-adhesion polymer coating diaphragm has the characteristics of uniform and consistent dispersion in the solvent and good stability, and is suitable for preparing batteries by adopting a wet-pressing and/or dry-pressing battery process; after the battery is manufactured, the hot-pressing formation condition is mild, the bonding force is excellent, and the good battery hardness and the long-acting cycle life of the soft package battery can be guaranteed. |