Composite microporous film, and production method and use thereof

一种微多孔膜、多孔质体的技术，应用在复合微多孔膜及其制造领域，能够解决易剥离等问题，达到电池反应稳定、透过性优异、机械强度优异的效果

一种微多孔膜、多孔质体的技术，应用在复合微多孔膜及其制造领域，能够解决易剥离等问题，达到电池反应稳定、透过性优异、机械强度优异的效果

CN1882436AActive Publication Date: 2006-12-20TORAY IND INC
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  • Composite microporous film, and production method and use thereof
  • Composite microporous film, and production method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] (1) Preparation of fluororesin mixture

[0098] At room temperature, 2.7 parts by mass of poly(hexafluoropropylene-vinylidene fluoride) copolymer (trade name: Kynar2801, manufactured by ATOFINA Corporation, hexafluoropropylene content: about 10 mass%, melt viscosity: 2300 to 2700Pa·s) It was dissolved in 73 parts by mass of acetone to prepare a fluororesin solution. Add 24.3 parts by mass of mixed xylene to the obtained fluororesin solution (75.7 parts by mass) mol% or more than 80 mol%], the preparation of fluororesin mixture.

[0099] (2) Formation of covering layer

[0100] Polyethylene microporous film [trade name: Seti Ichira, manufactured by Tonen Chemical Co., Ltd., thickness 21.9 μm, air permeability: 253sec / 100cc, puncture strength: 3028mN / 20μm, thermal shrinkage is conveyed at a speed of 2 m / min. Efficiency: 16% (MD: 105°C / 8 hours), 5.5% (TD: 105°C / 8 hours), tensile strength at break: 90MPa (MD), 65MPa (TD), average through-hole diameter: 0.04μm, maximum po...

Embodiment 2

[0102] A composite microporous membrane was produced in the same manner as in Example 1, except that toluene (dipole moment: 0.375 Debye) was used as a poor solvent to prepare a fluororesin mixture.

Embodiment 3

[0104] Except that the mixing ratio of acetone is set to 68.1 parts by mass, and 29.2 parts by mass of 1-butanol (dipole moment: 1.68 Debye) is added as a poor solvent to prepare the fluororesin mixture, the composite microparticles are produced in the same manner as in Example 1. porous membrane.

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Abstract

Disclosed is a composite microporous film which is obtained by applying a liquid mixture containing (a) a fluororesin which can be gelated, (b) a good solvent therefor and (c) a poor solvent therefor having a dipole moment of not more than 1.8 Debye to at least one surface of a polyolefin microporous film and drying it, thereby forming a coating layer composed of a porous body of the fluororesin on the surface. The composite microporous film has columnar through holes in the coating layer, and has an excellent balance among permeability, adhesion to electrodes, mechanical strength, thermal shrinkage resistance, shutdown characteristics and meltdown characteristics.

Description

technical field [0001] The present invention relates to a composite microporous membrane, a method for producing the same, and an application thereof, and in particular, relates to permeability, adhesion to electrodes, mechanical strength, heat shrinkage resistance, sealing (Shauttodown) characteristics, and melting (Meltdown) characteristics. Composite microporous membrane with excellent balance, its production method and use. Background technique [0002] Polyolefin microporous membranes are widely used in battery separators including lithium batteries, separators for various capacitors, various filters, moisture-permeable waterproof clothing, reverse osmosis membranes, ultrafiltration membranes, precision filtration membranes, etc. use. [0003] In separators for lithium secondary batteries and lithium ion batteries, in order to prevent battery heat generation, fire, rupture accidents, etc. In addition to the function of stopping the reaction of the battery, it is also ...

Claims

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Application Information

Patent Timeline
20 Dec 2006
Publication
CN1882436A
IPC
B32B27/30; B32B27/32; H01M2/16; C08J9/36; B01D69/12; B01D71/26; B01D71/32; B01D69/02; B01D71/34; H01M50/403; H01M50/417; H01M50/449; H01M50/451; H01M50/489; H01M50/491
CPC
B01D69/12; B01D71/32; H01M2/1653; B01D69/02; H01M10/052; B01D71/34; B01D71/26; H01M2/145
Inventors
山田一博; 河野公一