Polyethylene composition for lithium-ion battery separator, lithium-ion battery separator, preparation method thereof, and lithium-ion battery
A lithium-ion battery, polyethylene technology, applied in battery pack parts, separators/films/diaphragms/spacers, secondary batteries, etc. And other issues
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[0032] The present invention also provides a preparation method for a lithium-ion battery separator, comprising: (1) melting and blending polyethylene, a pore forming agent, a crosslinking agent and a crosslinking aid to obtain a mixture A; (2) molding the mixture A It is an initial membrane B, and the gel content of the initial membrane B is less than 10% by weight; (3) performing high-temperature crosslinking on the initial membrane B to form a crosslinked membrane C, the gel of the crosslinked membrane C The content is greater than 40% by weight; (4) stretching the crosslinked film C to obtain a stretched film D; (5) immersing the stretched film D in an extractant for ultrasonic extraction, and then removing the extractant to obtain lithium Ion battery separator; wherein, the melt index MI of the polyethylene is 0.02g / 10min~6g / 10min; relative to 100 parts by weight of the polyethylene, the amount of the crosslinking agent is 0.03~8 parts by weight, so The amount of the cros...
Embodiment 1
[0065] (1) Formula of polyethylene composition for lithium ion battery diaphragm:
[0066] The matrix resin is HDPE with MI=0.3g / 10min (density=0.960g / cm 3 ) 100g, 82g of liquid paraffin, 0.65g of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, and 1g of triallyl isocyanurate.
[0067] (2) Lithium-ion battery diaphragm preparation:
[0068] Each component that forms the above formula is extruded and granulated in a low-shear twin-screw extruder (length-to-diameter ratio is 18 / 1, and the rotating speed of the screw is 100 rpm) to obtain mixture A, and the blending temperature is 140 °C, while testing the rheological curve of mixture A at 150 °C for 30 minutes, such as figure 1 shown. Depend on figure 1 It can be seen that during the melt blending process, the viscosity of the mixture A can remain basically unchanged under the test conditions, indicating that the formulation composition has good processing thermal stability and no crosslinking occurs. Mixture A was sampled an...
Embodiment 2
[0077] (1) Formula of polyethylene composition for lithium ion battery diaphragm:
[0078] The matrix resin is HDPE with MI=2.2g / 10min (density=0.957g / cm 3 ) 100g, liquid paraffin 110g, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane 0.65g, triallyl isocyanurate 1g.
[0079] (2) Lithium-ion battery diaphragm preparation:
[0080] Each component that forms the above formula is extruded and granulated in a low-shear twin-screw extruder (length-to-diameter ratio is 18 / 1, and the rotating speed of the screw is 100 rpm) to obtain mixture A, and the blending temperature is 150 ℃, the rheological curve of the test mixture A is the same as that in Example 1, and basically remains the same, indicating that the processing heat stability of this formula composition is good, and no crosslinking occurs. Mixture A was sampled and determined to have a gel content of 0.5% by weight;
[0081] The mixture A was molded by tableting (the molding temperature was 145° C.) to obtain an initial film ...
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