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Laminated porous film, separator for battery, and battery

A porous film and laminated technology, applied in the field of separators for non-aqueous electrolyte batteries, can solve the problems of not being able to be used as electrolytes, and achieve good air permeability

Inactive Publication Date: 2013-05-29
MITSUBISHI PLASTICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the aqueous solution will be electrolyzed at such a high voltage, it cannot be used as an electrolyte

Method used

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  • Laminated porous film, separator for battery, and battery
  • Laminated porous film, separator for battery, and battery
  • Laminated porous film, separator for battery, and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0226] With respect to 100 parts by mass of polypropylene-based resin (manufactured by Prime Polymer, Prime Polypro F300SV, MFR: 3.0 g / 10 minutes) as the thermoplastic resin composition (a) constituting the A layer, 3, as a β crystal nucleating agent was added. 0.2 parts by mass of 9-bis[4-(N-cyclohexylcarbamoyl)phenyl]-2,4,8,10-tetraoxaspiro[5.5]undecane, and then use Toshiba Machine Co., Ltd. A co-rotating twin-screw extruder (caliber φ40 mm, L / D: 32) was melt-kneaded at 280° C., processed into pellets, and resin composition A1 was obtained.

[0227] The above-mentioned resin composition A1 was extruded at 200°C by an extruder, extruded from a single-layer T-die, cooled and solidified with a casting roll at 123°C, and a laminated non-porous film with a thickness of 180 μm was obtained.

[0228] The above-mentioned laminated non-porous film was stretched to 4.0 times in the longitudinal direction at 10°C to 85°C by using a roll stretching machine, and then stretched to 5.0 ti...

Embodiment 2

[0232] A laminate was produced in the same manner as in Example 1, except that the concentration of the ultra-high molecular weight polyethylene solution was 0.001% by mass for the thermoplastic resin composition (b) constituting the nonwoven fabric layer (layer B). porous membrane.

Embodiment 3

[0234] For the thermoplastic resin composition (b) that constitutes the nonwoven fabric layer (B layer), high-density polyethylene (manufactured by Mitsui Chemicals, HI-ZEX3300F) was selected, and the same method as in Example 1 was made except that laminated porous membrane.

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Abstract

The purpose is to provide a laminated porous film having shutdown characteristics, which are important in terms of ensuring safety, while also having excellent air permeation performance, which contributes to electrical performance, when used as a separator for a battery. The present invention is a laminated porous film characterized by comprising: a porous film layer having a thickness of 10 [mu]m or more, the main component thereof being a thermoplastic resin composition having a crystal-melting peak temperature of 150-250 DEG C; and a nonwoven fiber layer having a fiber diameter of 1 [mu]m or less, the main component thereof being a thermoplastic resin composition having a crystal-melting peak temperature of 100 DEG C to less than 150 DEG C; the air permeability of the laminated porous film being 10-10,000 s / 100 mL.

Description

technical field [0001] The present invention relates to a laminated porous film, which can be used as packaging products, hygiene products, animal products, agricultural products, construction products, medical products, separation membranes, and separators for batteries, and is particularly preferably used as separators for non-aqueous electrolyte batteries. Background technique [0002] Porous polymers with many fine interconnected pores have been used in separation membranes used in the preparation of ultrapure water, purification of chemical solutions, water treatment, etc., waterproof and moisture-permeable membranes used in clothing / sanitary materials, or batteries, etc. Used in various fields such as battery separators. [0003] Secondary batteries are widely used as power sources for portable devices such as OAs, FAs, home appliances, and communication devices. In particular, portable devices using lithium-ion secondary batteries are increasing because of good volum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B5/24B32B27/32H01M2/16H01M50/403H01M50/417H01M50/451H01M50/489H01M50/491
CPCY02E60/12H01M2/1686H01M2/145H01M2/1653Y02E60/10H01M50/403H01M50/44H01M50/446H01M50/417H01M50/491H01M50/451H01M50/489B32B5/24B32B27/32H01M50/411H01M50/449
Inventor 根本友幸
Owner MITSUBISHI PLASTICS INC
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