Bag type PVC/silicon dioxide battery separator and preparation method thereof

[0033] The preparation method of described a kind of pouch type PVC / silicon dioxide cell separator, comprises the following steps:

[0034] 1) Mix PVC, silicon dioxide, plasticizer and stabilizer evenly, spray the solvent into the mixture to obtain a premix;

[0035] 2) Extrude the premixed material, shape it, wash it, and dry it to obtain a flaky PVC / silicon dioxide separator;

[0036] 3) Fold the sheet-shaped PVC / silicon dioxide separator in half and seal the edges to obtain a bag-type PVC / silicon dioxide battery separator.

[0037] Preferably, in step 1), the spraying method of the solvent is atomized spraying.

[0038] Preferably, in step 2), the sheet-shaped PVC / silicon dioxide separator is one of flat, corrugated or ribbed separators.

[0039] Preferably, in step 3), the edge sealing is performed by a heat sealer or an ultrasonic sealing machine for bag sealing, and the edge sealing direction is perpendicular to the folding direction of the separator.

[0042] 30 kilograms of PVC, 20 kilograms of silicon dioxide, 20 kilograms of dibutyl phthalate and 5 kilograms of stabilizer are placed in the mixer and mixed evenly, and 25 kilograms of cyclohexanone is slowly sprayed into the mixture with an atomizing nozzle, and the ring Hexanone is uniformly absorbed by the mixture to obtain a premix. Put the premixed material into the extruder, and get the flat PVC / SiO through extrusion, molding, cleaning and drying processes 2 clapboard. Fold the flat partition in half and seal the edges with a heat sealer to obtain a flat bag-type PVC / SiO2 2 clapboard.

[0043] The flat bag type PVC / SiO prepared by this formula 2 The thickness of the separator is 0.15mm, and the resistance is 0.00018Ω·dm 2 , The porosity is 73%, and the wetting speed of sulfuric acid electrolyte is less than 5 seconds.

[0045] Put 40 kg of PVC, 5 kg of silicon dioxide, 30 kg of epoxy soybean oil and 5 kg of stabilizer in a mixer and mix evenly. Slowly spray 20 kg of tetrahydrofuran into the mixture with an atomizing nozzle. THF is evenly absorbed by the mixture , to obtain the premix. Add the premix into the extruder, and get the corrugated PVC / SiO through extrusion, molding, cleaning and drying processes 2 clapboard. Fold the corrugated separator in half and seal the edges with a heat sealer to obtain a corrugated bag-type PVC / SiO 2 clapboard.

[0046] The corrugated bag-type PVC / SiO prepared by this formula 2 The thickness of the separator is 0.20mm, and the resistance is 0.00024Ω·dm 2 , The porosity is 82%, and the wetting speed of sulfuric acid electrolyte is less than 5 seconds.