▎ 摘　　要

NOVELTY - Manufacture of double-sided polyvinylidene fluoride composite separator involves mixing carbon structure and titanium oxide with solvent and dispersing with ultrasonic waves to obtain a solution (a), mixing pore control agent (c1) containing polyethylene glycol and polyvinylpyrrolidone, and pore control agent (c2) with solution (a) obtain a solution (b), mixing polyvinylidene fluoride polymer with solution (b) to obtain solution (c), casting solution (c) to a thickness of 20-600 μ m after forming a film on another side of mesh to obtain membrane forming composite separator (m1), performing a phase transition (T1) from alcohol to membrane forming composite separation membrane (m1), performing a phase transition (T2) on membrane forming composite separation membrane (m1) subjected to phase transition (T1) in distilled water, and heating dried membrane-forming composite separator (m1) to melt-bond polyvinylidene fluoride of membrane-forming composite separator (m1) with mesh and cooling. USE - Manufacture of double-sided polyvinylidene fluoride composite separator (claimed) used for lithium secondary polymer battery. ADVANTAGE - The method provides double-sided polyvinylidene fluoride composite separator having excellent mechanical property, thermal property and chemical resistance, and suppressed biofouling phenomenon and ultrasonic waves while exhibiting high ultrasonic reactivity. DETAILED DESCRIPTION - Manufacture of double-sided polyvinylidene fluoride composite separator involves mixing 0.1-10 pts. wt. carbon structure chosen from graphene oxide, reduced graphene and carbon nanotube containing carboxyl or hydroxyl group, and 0.1-12 pts. wt. titanium oxide with 65-95 pts. wt. solvent and dispersing with ultrasonic waves to obtain a solution (a), mixing 1-18 pts. wt. pore control agent (c1) containing polyethylene glycol having a molecular weight of 190-610 and polyvinylpyrrolidone having a weight average molecular weight of 8000-900000, and 1-22 pts. wt. pore control agent (c2) with the solution (a) and stirring at 70-90° C to obtain a solution (b), mixing 21-38 pts. wt. polyvinylidene fluoride polymer with the solution (b) and stirring at 70-90° C to obtain a solution (c), casting the solution (c) to a thickness of 20-600 μ m after forming a film on another side of mesh having a pore size of 25-400 μ m, and provided with a release paper on one side, to obtain a membrane forming composite separator (m1), performing a phase transition (T1) from alcohol to the membrane forming composite separation membrane (m1), performing a phase transition (T2) on membrane forming composite separation membrane (m1) subjected to the phase transition (T1) in distilled water, washing membrane forming composite separator (m1) after removing the release paper, drying the washed membrane forming composite separator (m1) at 80-120° C, heating the dried membrane-forming composite separator (m1) in an atmospheric furnace at 180-220° C to melt-bond polyvinylidene fluoride of the membrane-forming composite separator (m1) with the mesh and cooling, casting the solution (c) to a thickness of 20-600 μ m after film formation on one side of the mesh from which the release paper is removed from the cooled primary membrane formation composite separator to obtain a membrane formation composite separator (m2), performing the phase transition (T1) from alcohol to the membrane forming composite separation membrane (m2), performing the phase transition (T2) on the membrane forming composite separation membrane (m2) subjected to the phase transition (T1) in distilled water, washing the membrane forming composite separation membrane (m2), drying the washed membrane forming composite separator (m2) at 80-120° C, and heating the dried membrane composite separator (m2) in an air furnace at 230-290° C to melt-bond polyvinylidene fluoride of the membrane composite separator (m2) with the mesh and cooling. An INDEPENDENT CLAIM is included for the double-sided polyvinylidene fluoride composite separator.