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Laminated porous film, separator for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in the field of laminated porous membrane, can solve the problems of membrane rupture, fire, short circuit between two poles, etc., and achieve the effect of excellent heat resistance

Active Publication Date: 2012-11-14
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in recent years, with the increase in energy density and output of non-aqueous electrolyte secondary batteries including lithium-ion secondary batteries, the conventional SD characteristics cannot fully function, and the temperature inside the battery exceeds 150 °C, which is the melting point of polyethylene. When the temperature is around ℃ and further rises, the film ruptures due to the heat shrinkage of the separator, which leads to a short circuit between the two poles, and even a fire accident

Method used

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  • Laminated porous film, separator for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery
  • Laminated porous film, separator for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery
  • Laminated porous film, separator for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

Examples

Experimental program
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Embodiment

[0187] Hereinafter, examples and comparative examples are shown, and the laminated porous membrane of the present invention will be described in more detail, but the present invention is not limited to these examples. In addition, the longitudinal direction of a laminated porous film is called "longitudinal direction", and the direction perpendicular|vertical to a longitudinal direction is called "horizontal direction."

[0188] (1) Film thickness

[0189] Using a dial gauge of 1 / 1000 mm, 30 places in the plane were not specified and measured, and the average value was taken as the film thickness.

[0190] (2) Content of filler (a)

[0191] The content of the filler (a) is a ratio relative to 100% by mass of the resin binder (b) in the dispersion.

[0192] (3) Stretching aid (c) content rate

[0193] The content of the stretching aid (c) is a ratio relative to 100% by mass of the resin binder (b) in the dispersion.

[0194] (4) Air permeability (Gurley value)

[0195] The...

manufacture example 1

[0225] With respect to the polypropylene-based resin (manufactured by Prime Polymer, Prime Polypro F300SV, density: 0.90 g / cm) as the polypropylene resin composition constituting the A layer 3 , MFR: 3.0g / 10 minutes) 100 parts by mass, add 3,9-bis[4-(N-cyclohexylcarbamoyl)phenyl]-2,4,8,10- 0.2 parts by mass of tetraoxaspiro[5.5]undecane, then put it into a co-rotating twin-screw extruder (manufactured by Toshiba Machinery Co., Ltd., caliber: φ40mm, L / D: 32), at a set temperature of 300°C Melting and kneading were carried out under the hood, extruded from a strip die, the extruded strands were cooled and solidified in water, and the strands were cut with a cutter to produce pellets of the polypropylene resin composition. The β-crystal activity of the polypropylene-based resin composition was 80%.

[0226] Next, as a polyethylene mixed resin composition constituting the B layer, high-density polyethylene (manufactured by Japan Polyethylene Company, Novatec HD HF560, density: 0....

manufacture example 2

[0230] With respect to polypropylene resin (manufactured by Prime Polymer, Prime Polypro F300SV, density: 0.90 g / cm 3, MFR: 3.0g / 10 minutes) 100 parts by mass, add 3,9-bis[4-(N-cyclohexylcarbamoyl)phenyl]-2,4,8,10- 0.2 parts by mass of tetraoxaspiro[5.5]undecane, then put it into a co-rotating twin-screw extruder (manufactured by Toshiba Machinery Co., Ltd., caliber: φ40mm, L / D: 32), at a set temperature of 300°C Melting and kneading were carried out under the hood, extruded from a strip die, the strands were cooled and solidified in water, and the strands were cut with a cutter to produce pellets of the polypropylene-based resin composition. The β-crystal activity of the polypropylene-based resin composition was 80%.

[0231] Using the above-mentioned polypropylene-based resin composition, it was extruded from a T-die, cooled and solidified by a casting roll at 124° C., and a non-porous film was produced.

[0232] The above-mentioned non-porous film was stretched 4.6 times ...

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Abstract

Disclosed is a laminated porous film that simultaneously satisfies communication, heat resistance, and workability, and has excellent properties as a separator for non-aqueous electrolyte secondary batteries. The laminated porous film is characterized in that a heat-resistant layer comprising a filler (a), a resin binder (b), and an extending agent (c) is laminated on at least one side of a porous polyolefin resin film, and in that the air permeability is no more than 2000 s / 100 ml.

Description

technical field [0001] The present invention relates to a laminated porous film, which can be used as packaging, sanitary, livestock, agricultural, construction, medical, separation membrane, light diffusion plate, and battery separator, and is particularly preferably used as a non-aqueous electrolyte battery. Partition use. 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] In particular, secondary batteries have been widely used as power sources for portable devices such as OAs, FAs, home appliances, and communication devices. Among them, since the volumetric efficiency is good when mounted in a device, and the size and weight of the device can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B5/22H01M2/16H01M10/0566H01M50/414H01M50/417H01M50/443H01M50/451
CPCH01M10/4235H01M2/1686B32B27/18Y02E60/122C08J7/04B32B5/32B32B27/08B32B27/32H01M10/052B32B5/18H01M2/1653H01M2/166B32B27/20B32B27/306B32B2264/102B32B2307/306B32B2307/518B32B2307/724B32B2457/10Y10T428/249983Y02E60/10H01M50/446H01M50/417H01M50/451H01M50/414H01M50/443B32B5/22H01M50/411H01M50/449
Inventor 高木义人今中智物江隆之根本友幸
Owner MITSUBISHI CHEM CORP