| abstract |
The invention discloses a low-moisture solvent-type PVDF coated diaphragm and a preparation method thereof, belonging to the technical field of lithium batteries. The separator comprises a microporous film of a polyolefin base material and a PVDF wet-process coating layer formed on one or both sides of the base material; the PVDF wet-process coating layer comprises: inorganic particles modified by a silane coupling agent, PVDF resin, acrylic acid Ester adhesive; the coated diaphragm is treated at 100 to 120° C. for 5 to 15 minutes, and the moisture of the diaphragm is tested with a Coulometric micro moisture tester, and the moisture value is lower than 500 ppm. The low-moisture solvent-type PVDF-coated separator provided by the present invention is hot-pressed at 80° C. and 1MPa for 300s, and the bonding strength is tested by a tensile testing machine, and the bonding strength between the coating and the battery pole piece is 5-30N/m. |