Porous separator having inverse opal structure for secondary battery and method for manufacturing the same
The present disclosure provides a porous separator substrate with an inverse opal structure obtained by using an engineering plastic resin with high heat-resistance, and a manufacturing method thereof. In the method, a non-crosslinked polymer resin is used to form an opal structure and a crosslinked polymer resin is penetrated into the opal structure and an organic solvent is used to remove the polymer particles being used to form the opal structure, thereby manufacturing a porous substrate with an inverse opal structure. According to the present disclosure, a separator having good porosity and air permeability can be provided without the problems of heat-resistance decrease, pore closing and thickness decrease.
1. A method for manufacturing a porous substrate with an inverse opal structure, comprising:
preparing a colloid solution containing polymer particles (S 10 );
coating the colloid solution on a substrate to form a coating layer of the polymer particles with an opal structure (S 20 );
dispersing a polymer resin in a first organic solvent to obtain a polymer resin dispersion (S 30 ),
wherein the first organic solvent is methylene chloride,
wherein the polymer resin is a crosslinked polymer, and
wherein the polymer resin is an engineering plastic resin with high heat-resistance selected from the group consisting of polysulfone (PSF), polyethersulfone (PES), polyetherimide (PEI), polyphenylenesulfide (PPS), polyether ether ketone (PEEK), polyacrylate (PA), polyamideimide (PAI), polyimide (PI), and mixtures thereof;
filling the opal structure of the polymer particles with the polymer resin dispersion (S 40 ); and
melting the polymer particles with a second solvent (S 50 ).
2. The method of claim 1 , wherein the polymer particles are a non-crosslinked polymer.
3. The method of claim 1 , wherein the polymer particles are selected from the group of consisting of styrene-butadiene rubber (SBR), polybutadiene rubber, polychloroprene (neoprene), nitrile rubber, acryl rubber, fluorinated rubber (FKM), polyvinyl chloride (PVC), polystyrene, polymethylmethacrylate (PMMA), acrylonitrile-butadiene-styrene (ABS), polyvinylidene fluoride, polyvinyl fluoride, polytetrafluoroethylene (PTFE), polyvinyl acetate or a copolymer thereof, vinylacetate-ethylene copolymer, and a mixture thereof.
4. The method of claim 1 , wherein the polymer particles have a diameter of 0.1 to 1 μm.
5. The method of claim 1 , wherein the polymer resin is an engineering plastic resin with high heat-resistance.
6. The method of claim 1 , wherein the second organic solvent is a solvent capable of melting the polymer particles selectively.