Composite porous membrane, method for producing composite porous membrane and battery separator using same

A technology of a porous membrane and a manufacturing method, which is applied in battery pack parts, chemical instruments and methods, separators/films/diaphragms/spacers, etc., can solve the problem that it is difficult to combine the adhesion and breathability of the heat-resistant resin layer. The range of resistance increases, the adhesion of the heat-resistant resin layer is reduced, and it is difficult to ensure safety, etc., to achieve the effect of excellent ion permeability

Active Publication Date: 2013-03-06
TORAY IND INC
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  • Abstract
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Problems solved by technology

[0013] In Patent Document 5, although the air permeability resistance does not increase significantly, the adhesion between the polyethylene porous film and the heat-resistant resin is extremely small. Like Patent Document 4, especially when the thickness of the polyethylene porous film is less than In the case of 10 μm, the heat-resistant resin layer may peel off, making it difficult to ensure safety
[0014] In this way, in a composite porous membrane in which a heat-resistant resin layer is laminated on a porous membrane of polyolefin or the like used as a base material, if the heat-resistant resin is intended to permeate into the porous membrane used as a base material to improve the If the adhesion of the heat-resistant resin layer increases, the increase in air resistance increases. If th

Method used

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  • Composite porous membrane, method for producing composite porous membrane and battery separator using same

Examples

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Example Embodiment

[0119] Example 1

[0120] In a 4-necked flask equipped with a thermometer, a cooling tube, and a nitrogen introduction tube, add 1 mol of trimellitic anhydride (TMA), 0.8 mol of o-tolidine diisocyanate (TODI), and 2,4-toluene diisocyanate (TDI). 0.2 mol and 0.01 mol of potassium fluoride were added together with N-methyl-2-pyrrolidone so that the solid content concentration was 20%, and after stirring at 100°C for 5 hours, N-methyl was used so that the solid content concentration was 14%. Dilute 2-pyrrolidone to synthesize a polyamide-imide resin solution (a). The logarithmic viscosity of the obtained polyamideimide resin was 1.35 dl / g, and the glass transition temperature was 320°C.

[0121] 48 parts by mass of this polyamideimide resin solution (a) was diluted with 39 parts by mass of N-methyl-2-pyrrolidone, and 13 parts by mass of ethylene glycol was added to prepare varnish (a) (solid content concentration 5.5 weight%). The varnish (a) was applied to the corona-treated surfa...

Example Embodiment

[0122] Example 2

[0123] Make the absolute humidity in the low humidity area 4.0g / m 3 Except for this, the same operation as in Example 1 was carried out to obtain a composite porous membrane.

Example Embodiment

[0124] Example 3

[0125] Make the absolute humidity in the low humidity zone 5.5g / m 3 Except for this, the same operation as in Example 1 was carried out to obtain a composite porous membrane.

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Abstract

Disclosed is a composite porous membrane which can achieve both an excellent adhesiveness of a heat-resistant resin layer and a small rise in gas permeation resistance even in the case of further reducing the thickness of membranes to be used, for example, battery separators. Specifically disclosed is a composite porous membrane comprising a porous membrane (A) formed of a polyolefin-based resin and a porous membrane (B) containing a heat-resistant resin, said porous membrane (B) being laminated on said porous membrane (A), wherein said porous membrane (A) has a thickness being within a specific range, an average pore size being within a specific range and a porosity being within a specific range and the thickness of the entire composite porous membrane is within a specific range, characterized in that, in said composite porous membrane, the peel strength at the interface between the specific porous membrane (A) and porous membrane (B) is within a specific range and the difference between the gas permeation resistance of the entire composite porous membrane and the gas permeation resistance of the porous membrane (A) is also within a specific range.

Description

technical field [0001] The present invention relates to a composite porous membrane in which a porous membrane comprising a heat-resistant resin is laminated on a porous membrane formed of a polyolefin resin, and particularly relates to a polyolefin-based porous membrane having excellent ion permeability and a heat-resistant It is a composite porous membrane useful as a lithium-ion battery separator because of its excellent adhesion to a permanent resin film. Background technique [0002] Porous membranes made of thermoplastic resins are widely used as materials for separation, selective permeation and isolation of substances, and the like. For example, battery separators used in lithium secondary batteries, nickel-hydrogen batteries, nickel-cadmium batteries, polymer batteries, separators for electric double layer capacitors, reverse osmosis filtration membranes, ultrafiltration membranes, precision filtration membranes, etc. Used in various filters, moisture-permeable wat...

Claims

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Application Information

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IPC IPC(8): B32B27/32B32B5/18H01M2/16H01M50/403H01M50/414H01M50/451H01M50/489H01M50/491
CPCY02E60/12B32B27/32B32B5/18B32B2305/026B32B2307/724B32B27/16B32B2457/10B32B27/281B32B27/34B32B3/26B32B2250/02H01M2/145B32B2250/24B32B27/08B32B2307/308H01M2/1653H01M2/1686H01M2/16Y02E60/10H01M50/403H01M50/451H01M50/414H01M50/491H01M50/489H01M50/409B32B5/32B32B37/025B29C67/202C08J9/28H01M50/411H01M50/449B32B2037/268
Inventor 水野直树入江达彦鲇泽佳孝中村匡德
Owner TORAY IND INC
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