Method of producing laminated separator for nonaqueous electrolyte secondary battery
AssigneeSumitomo Chemical Company, Limited
InventorsToshihiko OGATA, Chikara MURAKAMI
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Abstract
A laminated separator for a nonaqueous electrolyte secondary battery, (i) includes a porous film and a porous layer containing a polyvinylidene fluoride-based resin and (ii) has an excellent rate characteristic. The laminated separator includes the porous film containing a polyolefin-based resin as a main component and the porous layer containing the polyvinylidene fluoride-based resin, in which a surface of the porous layer has a 60-degree specular gloss of 3% to 26%.
Claims5
1-7. (canceled)
A method of producing a laminated separator for a nonaqueous electrolyte secondary battery, the laminated separator including (i) a porous layer containing a polyolefin-based resin at a proportion of not less than 50% by volume and (ii) a porous layer containing a polyvinylidene fluoride-based resin, the method comprising the steps of:
- applying a coating solution, in which the polyvinylidene fluoride-based resin is dissolved, to the porous film to form a coating layer
- separating the polyvinylidene fluoride-based resin out of the coating layer;
- and
- adjusting a gloss of the coating layer from which the polyvinylidene fluoride-based resin has been separated,
- wherein the gloss is adjusted by a chemical treatment, a physical treatment of removing a surface of the coating layer, a corona treatment, or a plasma treatment.
Dependencies are inferred from the claim text.