Lithium battery modified coating diaphragm and preparation method thereof

The invention discloses a lithium battery modified coating diaphragm and a preparation method thereof, and the preparation method comprises the following steps: carrying out single-side or double-side coating, drying and rolling on a base membrane by using aqueous blended slurry to obtain the lithium battery modified coating diaphragm, wherein the water-based blended slurry is prepared from the following components in parts by mass: 5 to 10 parts of acetic acid, 5 to 7 parts of PVDF powder, 1 to 3 parts of dispersing agent, 50 to 100 parts of thickening agent, 50 to 100 parts of deionized water and 1 to 10 parts of binding agent. The use amount of the PVDF material is not increased, the bonding force between the diaphragm coating and the battery pole piece is improved, the surface wettability of the material is improved, the liquid absorption performance is improved, and the cycle index of the battery is increased. 本发明公开了一种锂电池改性涂层隔膜及其制备方法，制备方法包括以下步骤：采用水系共混浆料在基膜上进行单面或双面涂覆，烘干，收卷，得到所述锂电池改性涂层隔膜，其中，所述水系共混浆料包括：5～10