The present invention discloses a coated separator for lithium-ion batteries and a processing technique thereof, comprising a base membrane and a coating layer. The base membrane is made of polypropylene or polyethylene, and the coating layer is a silicon dioxide coating or an aluminum oxide coating. The processing technique comprises the following steps: Step 1, sheet forming; Step 2, thermal lamination; Step 3, film spreading; Step 4, heat treatment; Step 5, stretching and film winding; Step 6, separator cleaning; Step 7, spraying and drying. The present invention changes the conventional heat treatment mode by applying heat treatment to a single-layer separator, facilitating uniform heat treatment. Meanwhile, multi-stage stretching is adopted during separator stretching to avoid separator breakage, reducing waste of raw materials. Dust remaining on the separator before coating spraying is removed, lowering coating shedding rate and improving separator quality.
Area Code: CN
Application Number: CN202010532511.3
