| abstract |
The present invention relates to a separation membrane comprising a porous polyolefin substrate, and an organic-inorganic hybrid porous coating layer comprising a mixture of inorganic particles and at least one inorganic particle formed on at least one side of the substrate, wherein the binder- A functional binder capable of preventing internal short-circuiting through a self-healing function to some damage of the separation membrane, improving the adhesion between the separation membrane and the anode and cathode, coping with the elution of the cathode material transition metal, and a separator The invention. In the binder according to the present invention, the proportion of the hydroxyl group in each molecule is 10% by weight or more. |