A kind of composite polypropylene microporous membrane and its preparation method and lithium-ion battery diaphragm comprising the membrane
A technology of compounding polypropylene and microporous film, applied in the field of microporous film, can solve the problems of poor fit, low surface energy, poor wettability, etc.
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Examples
Embodiment 1
[0063] The homopolypropylene resin whose melt index is 2.5g / 10min is mixed with the polypropylene beta crystal nucleating agent N,N-dicyclohexyl-2,6 naphthalene diamide accounting for 0.03wt% of the homopolypropylene resin, and mixed uniformly in After melting at a temperature of 200-250°C, a polypropylene layer melt is formed;
[0064] Mix polyvinylidene fluoride and boehmite with a mass ratio of 3:2 evenly, that is, mix polyvinylidene fluoride accounting for 60 wt% of the total non-polypropylene layer with boehmite accounting for 40 wt% of the total non-polypropylene layer , After melting at a temperature of 200-250 ° C, a non-polypropylene layer melt is formed.
[0065] The polypropylene layer melt and the non-polypropylene layer melt are fed into the three-layer co-extrusion T-die head through the melt pipe, the polypropylene layer is on both surfaces, and the non-polypropylene layer is on the core layer. Cool and crystallize on a film roll to obtain a polypropylene film ...
Embodiment 2
[0068] Except that the composition of the polypropylene porous layer is different, the others are the same as in Example 1. The non-polypropylene layer is composed of polyvinylidene fluoride and polytetrafluoroethylene nanopowder with a mass ratio of 4:1, that is, polyvinylidene fluoride accounting for 80 wt% of the total non-polypropylene layer and 20 wt% of the total non-polypropylene layer PTFE nanopowder. The obtained composite microporous membrane had a thickness of 25 micrometers. The thicknesses of the two polypropylene microporous layers are 8 microns respectively, and the thickness of the non-polypropylene porous layer of the core layer is 9 microns.
[0069] When the composite polypropylene microporous membrane prepared above is used as a lithium-ion battery separator, the wettability and liquid absorption rate of the separator to the lithium-ion battery electrolyte are significantly improved compared with the single-layer polypropylene separator.
Embodiment 3
[0071] Unless the composition of the polypropylene layer is polyethylene terephthalate (PET) and aluminum oxide with a mass ratio of 3:2, that is, polyethylene terephthalate and aluminum oxide accounting for 60 wt% of the total non-polypropylene layer Accounting for the aluminum oxide of 40wt% of the total non-polypropylene layer, the non-polypropylene layer is on both surfaces, and the polypropylene layer is outside the core layer, and the rest of the steps are the same as in Example 1. The obtained composite microporous membrane had a thickness of 25 micrometers. The thicknesses of the two non-polypropylene porous layers are respectively 8 microns, and the thickness of the core polypropylene microporous layer is 9 microns.
[0072] When the composite polypropylene microporous membrane prepared above is used as a lithium-ion battery separator, the wettability and liquid absorption rate of the separator to the lithium-ion battery electrolyte are significantly improved compared...
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Abstract
Description
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