SEPARATOR HAVING POROUS COATING LAYER AND ELECTROCHEMICAL DEVICE HAVING THE SAME
The present invention refers to a method for manufacturing a separator, comprising preparing first inorganic particles having an average diameter of 1 to 10 μm and coated with a coupling agent, and second inorganic particles having an average diameter of 50 to 500 nm and coated with a coupling agent on the surface thereof; mixing the first inorganic particles and the second inorganic particles together with a binder polymer and adding the resulting mixture to a solvent to obtain a slurry; and coating the slurry on at least one surface of a porous substrate.
1 . A method for manufacturing a separator, comprising
preparing first inorganic particles having an average diameter of 1 to 10 μm and coated with a coupling agent, and second inorganic particles having an average diameter of 50 to 500 nm and coated with a coupling agent on the surface thereof;
mixing the first inorganic particles and the second inorganic particles together with a binder polymer and adding the resulting mixture to a solvent to obtain a slurry; and
coating the slurry on at least one surface of a porous substrate.
2 . The method for manufacturing a separator according to claim 1 , wherein the slurry further comprises functional particles.
3 . The method for manufacturing a separator according to claim 1 , wherein the weight ratio of the first inorganic particles:the second first inorganic particles ranges from 50:50 to 90:10.
4 . The method for manufacturing a separator according to claim 1 , wherein the weight ratio of a mixture of the first inorganic particles and the second first inorganic particles:the binder polymer ranges from 80:20 to 90:10.
5 . The method for manufacturing a separator according to claim 2 , wherein the functional particles are selected from a water scavenger, a Mn scavenger, an HF scavenger and a mixture thereof.