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Multi-layered porous film, electrical cell separator, and electrical cell

A technology of laminating porous membranes and porous membranes, applied in batteries, secondary batteries, battery pack components, etc., can solve the problems of generating metal foreign bodies, wearing cutting blades, mixing metal foreign bodies in batteries, etc., to achieve excellent melting resistance, heat The effect of low shrinkage

Active Publication Date: 2014-12-03
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the separator contains an inorganic filler, the cutting blade is worn during the cutting process of the separator, resulting in metal foreign matter, which may be mixed in the battery

Method used

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  • Multi-layered porous film, electrical cell separator, and electrical cell
  • Multi-layered porous film, electrical cell separator, and electrical cell
  • Multi-layered porous film, electrical cell separator, and electrical cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0103] The present invention will be described in more detail by the following examples, but the present invention is not limited to these examples.

[0104] Polyolefin Porous Membrane A

[0105] Here, a porous polyethylene film (thickness: 16 μm, air impermeability: 110 sec / 100ccAir, porosity: 48%) was used as the polyolefin porous film A to produce a laminated porous film. The physical properties of the polyethylene porous membrane will be described later.

Synthetic example 1

[0107] Synthesis of heat-resistant resin (polyamideimide)

[0108] 1 mole of trimellitic anhydride (TMA), 0.8 mole of ortho-toluene diisocyanate (TODI), 0.2 mole of 2,4-toluene diisocyanate (TDI), 0.01 mole of potassium fluoride and N-methyl-2-pyrrolidone Put them together into a four-necked flask with a thermometer, a cooling tube, and a nitrogen gas introduction tube, wherein the solid content concentration was 20%, stirred at 100°C for 5 hours, and then diluted with N-methyl-2-pyrrolidone to make the solid content The concentration was changed to 14%, and a polyamideimide resin solution (a) was synthesized. The inherent viscosity of the obtained polyamide-imide resin was 1.35 dL / g, and the glass transition temperature was 320°C.

[0109] Preparation of varnish for forming porous layer B

[0110] According to the compounding ratio shown in Table 2, the binder resin (b), filler (a), solvent, and zirconia beads (Toray Co., Ltd. "Torayceram" (registered trademark) beads, diam...

Embodiment 1～3 and comparative example 2

[0112] Lamination of porous layer B containing heat-resistant resin as binder (b)

[0113] Using the above-obtained varnish, apply it on the polyolefin porous membrane A by the knife coating method, and pass through it in 8 seconds at a temperature of 25°C and an absolute humidity of 1.8g / m 3 The low humidity area, followed by 5 seconds through the temperature of 25 ℃, absolute humidity of 12g / m 3 The high-humidity zone, and then immersed in an aqueous solution containing 5% by weight of N-methyl-2-pyrrolidone for 10 seconds, washed with pure water, and then dried by a hot air drying oven at 70°C to obtain a laminated porous membrane. At this time, the gap of the doctor blade is adjusted so that the dry film thickness of the porous layer B becomes a predetermined thickness.

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Abstract

A multi-layered porous film in which a porous layer (B) for which a filler (a) and binder resin (b) are essential components is provided to at least one side of a polyolefin porous film (A), the true specific gravity of the filler (a) being less than 2.0 g / cm3. Provided is a multi-layered porous film offering low heat shrinkage and excellent melt-down resistance properties without compromising the properties of insulation performance, ion permeability, light weight, and slip performance normally required for a separator. Also provided is an electrical cell or capacitor of high safety and high weight energy density in which the multi-layered porous film is used as a separator.

Description

technical field [0001] The present invention relates to a laminated porous film having a low heat shrinkage rate and excellent melting resistance without sacrificing properties such as insulation, ion permeability, light weight, and slidability originally required for a separator. It further relates to a battery or capacitor having high safety and high weight energy density (weight energy density) using the laminated porous film as a separator. Background technique [0002] Thermoplastic resin porous membranes are widely used as material separation membranes, permselective membranes, separator materials, and the like. For example, it can be used in various filters such as reverse osmosis filtration membranes, ultrafiltration membranes, and microfiltration membranes, moisture-permeable waterproof clothing, etc., battery separators used in lithium-ion batteries, nickel-hydrogen batteries, etc., and separators for electrolytic capacitors. and other uses. Among them, polyolefi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B5/32C08J9/28H01M2/16H01M50/414H01M50/451H01M50/457H01M50/489H01M50/491
CPCH01M2/1686B32B5/32B32B27/32H01M2/1653H01M10/0525Y02E60/10H01M50/491H01M50/451H01M50/414H01M50/489H01M50/457H01M50/417H01M50/446H01M50/449H01M50/443H01M50/463H01M50/403C08J9/28H01M2220/10H01M2220/20H01M2220/30
Inventor 清水健水野直树入江达彦
Owner TORAY IND INC
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