Polyolefin laminated microporous membrane
A microporous membrane, polyolefin technology, applied in structural parts, electrical components, battery pack parts, etc., can solve the problems of surface deterioration, blackening of separators, etc.
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no. 1 approach
[0106] The microporous membrane according to the first embodiment has a laminated structure, at least one layer of the multilayers constituting the laminated structure contains polyolefin having one or more functional groups, and after being housed in an electrical storage device, (1) the polyolefin A condensation reaction occurs between functional groups of olefins, or (2) a functional group of polyolefin reacts with chemical substances inside the power storage device, or (3) a functional group of polyolefin reacts with other kinds of functional groups to form a cross-linked structure. In the first embodiment, the microporous membrane can ensure strength through a laminated structure, or impart functions, or be suitable for various uses, porosity processes, or processing processes, and further by any one of the above (1) to (3) The cross-linked structure formed by this reaction can improve the strength and resistance to membrane rupture at high temperatures above 150°C. For ex...
no. 2 approach
[0112] The microporous membrane according to the second embodiment has a laminated structure, and at least one layer among the multilayers constituting the laminated structure contains polyolefin having an amorphous part crosslinked structure in which amorphous parts are crosslinked. The microporous membrane according to the second embodiment can secure strength, impart functions, or make it suitable for various uses, porosity processes, or processing processes by virtue of its laminated structure. In addition, the microporous membrane of the second embodiment has an amorphous part crosslinked structure of polyolefins such as polyethylene and polypropylene. It is possible to suppress the increase of internal stress or the deformation of the produced electrical storage device while taking into account the shutdown function and the resistance to membrane rupture at a high temperature of 150° C. or higher, thereby ensuring the safety of the electrical storage device. From the sam...
Embodiment 1
[0307]
[0308] High molecular weight polyethylene resin (PE, MFR=0.2, density=0.96g / cm 3 ) and the above-mentioned silane-modified polyethylene at a mass ratio of PE:silane-modified polyethylene=80:20 (mass %) are dry-blended, melted with a 2.5-inch extruder, and supplied to a T-die using a gear pump. The temperature of the mold was set at 210° C., and after the molten polymer was cooled by blowing air, it was rolled into a roll.
[0309] Similarly, polypropylene resin (PP, MFR=0.83, density=0.91g / cm 3 ) was melted with a 2.5-inch extruder, and supplied to a T-die using a gear pump. The temperature of the mold was set at 230° C., and after the molten polymer was cooled by blowing air, it was rolled into a roll.
[0310]The rolled PP and PE precursors (green films) each had a thickness of 5 μm. Next, the PP and PE precursors were bonded in the form of PP / PE / PP to obtain a green film having a three-layer structure of PP / PE / PP. This green film having a three-layer structur...
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Abstract
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